Sales of Telescopes

Sales of telescopes from my collection have started this year, in order to reduce the numbers! Eventually some items will be sent to a museum display, and plans are moving forward with that too.

Meanwhile, some units have been despatched to collectors in Germany, Israel, Italy and the USA. As well as a couple in the UK, in exotic locations like Grimsby, Cheltenham and Lancaster! It is of particular satisfaction that some of the named telescopes have been returned to the families or descendants of the original owners, or makers! Other collectors have been able to find useful spares for their own repairs, from my stock of bits, as long as they can describe what is needed adequately for me to understand it!

One of my correspondents has a display case that he used for one telescope now surplus to requirements – so if it would be useful for your scope, or for anything else, he’d be delighted to hear from you. The box is made from meranti hardwood, and is 27.3cm x 9.7cm internally, with a height of 9.7cm available. It is lined with purple velvet on top of a contoured foam base: he is asking £40 for it, on Ebay!

2018-08-08 15.40.35

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The telescope itself is not included!

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Worthington + Allan tapered scope

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This telescope was bought on Ebay in March 2018, from a guy in Aylesbury. It looked an absolute wreck: I wanted it because the maker, Worthington and Allan, was the partnership that took over the business of Matthew Berge when he died in 1820. Earlier Berge had been apprenticed to, and then taken over from Ramsden: both had made high quality instruments for astronomical observations and also general use. You will notice that some of the best telescopes in this collection have come from Ramsden or Berge, they were an offshoot business from the original Dollond family.

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Nathaniel Worthington had been an apprentice to Berge, at 199 Piccadilly, London, and the partnership with James Allan lasted from 1821 to 1834, located at 196 Piccadilly.  In 1834 Allan dropped out, and Nathaniel continued working under his own name until 1851. So this telescope dates from around 1830, and indeed it has the lens quality and build quality you would expect from such a firm.

The scope is my reference #319.

Description

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The scope has one single draw, and a long, tapered barrel in wood, apparently mahogany. Open it is nearly 80cms long, when closed it comes down to 66cms. On arrival, both of the brass to wood joints at the two ends were loose, basically the grub-screws had rusted away, and the wood around the screws had also rotted, so the holes were too big.

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Also the barrel was sleeved in a fairly badly fitting brown leather cover: the stitching was intact but it appeared to have shrunk by 1cm at each end, compared to what would have been a good fit. This did not appear to be an original part of the telescope, but a subsequent addition – possibly mimicking the metal barrelled telescope designs of the later, Victorian era.

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The major damage visible on this telescope is unusual – the brass mount at the eyepiece end of the barrel has had a major part, maybe an eighth of the circumference, torn out, without making any damage to the barrel wood beneath.

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The single draw has two lens cartridges, one at either end. The engraving on the first draw is noticeably on the “wrong” side of the telescope, as used in the C18th: this was just being phased out finally in the 1820s.

Renovation

The original condition above is shown in the photos from the Ebay description, and there follow some photos taken during the renovation work.

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There was not much that could be done to repair the broken area of the brass fitting: also the screws would not come out, so to secure the brass in place, and prevent the wobble, Superglue was used to fix it to the barrel. At the other end, the objective lens housing used round headed screws that were loose in the holes, so these were removed. New brass screws were fitted, in a different part of the wooden structure.

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The leather cover over the wooden barrel was slipped off, and the barrel paint/varnish removed with sand-paper. It was noticeable that it was a very red varnish, in some ways resembling paint. Another large tapered scope in the collection by Dollond, possibly from this period, also has this red appearance, as does the scope that is named after Jervis: see the links quoted below.  The colour came off easiest with sand-paper at the point that would have been the hand-hold, half way along. The barrel was then coated with French polish, which brought it up with a good mahogany red colouring.

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Barrel during sand paper treatment of the old varnish

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Finished barrel after French polish and wax

All brass fittings were rubbed hard with Brasso, then machine polished, and then polished again with Brasso, so they have nearly recovered to a light brass colour.

Similar scope designs

Some of the other samples of this style of scope are present in the collection: they are prized because they are so easy to use hand-held, like the original Dollond eight sided unit from the 1760s, and because of the long length they have a good magnification.  Ideal for spotting light club aircraft flying overhead.

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The scope that shows the parentage of the design is the Matthew Berge unit, reference #112. This is described on the page

https://telescopecollector.wordpress.com/2017/02/07/single-draw-large-wooden-scope-by-berge/

You will remember that Worthington worked with Berge and then took over the business.

A second similar unit is the Dollond, reference #58, shown on page

https://telescopecollector.wordpress.com/2014/02/05/c18th-dollond-with-tapered-body/

This unit has a split eyepiece tube, giving access to the lenses, a difficult design, but one which enabled the use of a smaller brass tube, which was presumably the best or only style available. There is then the Dollond ref #297, a more recent acquisition, shown on page

https://telescopecollector.wordpress.com/2016/12/20/a-tapered-dollond-from-1770/

Here again the later added leather sleeve was discarded to great effect: it is rather a long scope to hand hold for use spotting light aircraft!

The John Jervis (aka Earl St Vincent, after the major battles that brought Nelson to fame) telescope, also of a similar design, is discussed in the story about telescopes linked to Alresford, where I live: see

https://telescopecollector.wordpress.com/2016/07/22/naval-and-telescope-links-to-alresford/

Another story describes the telescope itself, and the renovation work on that:

https://telescopecollector.wordpress.com/2015/12/04/captain-sir-john-jervis-1735-1823/

The Ramsden telescopes I have tend to be smaller, three draw units: typically they are the only ones I could afford, made by Ramsden, as his models demand a high price, because of the quality. They also are not often seen on sites such as Ebay! These small units are described on this website too.

Original intended use

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No way would this large scope be considered for cavalry or Army use, it is too big anything other than naval/coastguard use, where space and a handy support spar or post would be available to lean against. The magnification is high for a telescope, maybe 30+, a significant advantage when spotting sails on the horizon.

Troughton and Simms nickel-plated scope

This is a telescope by Troughton and Simms, a famous British maker: the name is engraved on the first draw. But equally, as they worked in London over a long period, from 1826 until 1915, it is therefore difficult to date.

In 1788 Edward Troughton came to London from Cumbria, where his father was a farmer, to be apprenticed to his brother John, a scientific instrument maker based at 136 Fleet Street. When John retired in 1804 Edward took over the business, but around 1826 formed a partnership with William Simms, at that same address.  The business became known as Cooke, Troughton and Simms in 1915. This model is likely to date from very late Victorian or Edwardian times, judging by the design and the silver-coloured nickel plating.

Indeed the design is very unusual, in that it has a single draw, from a short barrel. The single draw has a split half way along, which gives access to the second lens cartridge.  The lens quality is what you would expect from such a maker.

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Indeed the objective shows the normal greenish hue of Victorian scopes.  The focus is interesting, the first draw has to be pushed a long way home to bring a sharp image for a long distant object but this has an advantage, in that the telescope can focus on very close objects too, around 2m or 6 feet away.

 

The other real advantage is that the brass body of the scope is plated with presumably a nickel plating, which looks silver.  This does not tarnish like the normal brass used on telescopes, so your hands stay clean and there is no polishing required: I have had this scope for over ten years and it has only ever needed a wipe over with a soft cloth, to keep it clean.

There is a sunshade over the objective. Overall widest OD is 50mm, and length closed is 9” (233mm), fully open it is 17” or 433mm.

Conclusions

NotDSC05827 really conclusions, more guesses! (1) I think this scope dates from the 1880s-90s. (2) It was probably built for, or aimed at, the professional Gentleman’s market: – the man who was a Surveyor, or Landowner. Reasons here are that a military one would not be coloured silver, at least without any leather cladding. A naval one would be bigger when closed, and longer when in use. The silver colour makes it try to show quality. The only drawback here is the size, it is hardly a pocket sized telescope!

This telescope was sold in 2018, to a current member of the Simms family, descended from the William Simms who set up this partnership in 1826. It was my reference #96, originally acquired in 2004.

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Bollemeijer & Brans Dutch telescope

 

DSC05800This is a fairly standard design of large three draw telescope, with an OD of 53mm (just over 2”), and a visible objective diameter of 36mm. But it is labelled on the eyepiece end flange as by Bollemeijer & Brans of Rotterdam – which was why it is of interest, as an example of a Dutch telescope.

The telescope construction is exactly the same as UK built equivalents, with five lens positions, the first draw containing two cartridges with two lenses each. These lenses are each glued into the threaded brass mounts, which are then positioned at each end of the cartridge. What seems to be consistent is that these lenses are nibbled at the edges to fit inside their respective mounts, and this nibbling in most of them is evident and affecting the visible part of the lens.

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Thankfully these slight imperfections do not interfere with the image quality, which is very good.

The extended length of the scope is 728mm, nearly 30”: it is fairly heavy (630gms), with a brass barrel, covered with black leather, which is stitched and seems to be the original. There is an objective lens cap, and a winking eyepiece lens cover. Closed up the telescope length is 245mm.

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As mentioned, the scope works well, but the surprise is that one of the draws has to be pushed home by 50% of its travel to achieve a focus on a distant object. The converse of this is that the close up capability is improved, so that objects as close as around 6 feet, ie below 2m distant, can be brought into focus easily.

The Bollemeijer family business

Grandfather (Opa) Bollemeijer started his optical business in Amsterdam in 1924, with his sons: it is possible that the “& Brans” means “and sons” in old Flemish or Dutch. It seems that from WW2 onwards Bollemeijer and his descendants have concentrated on the supply of spectacles, and no longer also produce instruments: they now are employing the fourth generation in the business, located in Heemskerk, closer to Amsterdam than Rotterdam.

amsterdam shop

        he Grandfather on the left, and his two sons on the right, in the original shop in the 1920s         (shown in the centre picture)

Obviously in the 1920s, if he had any business in Rotterdam, Opa Bollemeijer and sons Herman and Joop would have seen the need for supply of optical instruments like telescopes to the ship’s crews passing through this port. The photos from the 1920s of their shop (maybe in Amsterdam) show that they were Zeiss agents, dealing with cameras, perhaps more than working with spectacles. The picture of Herman and Joop shows new films and Kodak cameras on the shelves, and magnifying glasses in the display counter in front of them, which could have been made in the shop. So this all does suggest the telescope itself is probably dates from the late 1920s.

Reference #188

Naval three draw telescope

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This is another medium sized three draw telescope, solidly constructed with brass draws and barrel, but the barrel is decorated and protected with an interesting woven sleeve. The ends of this sleeve are finished off with what looks like a length of rope, but like the sleeve this has no obvious ends, and on close inspection seems to use the same thin wire or nylon cord, wound into the solid structure of the rope. The material is not metallic, so must be something like nylon, but made of six or more strands in a flat band and then woven into the diamond patterned covering.

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This is certainly a man-made woven cover, and not a natural covering like the fishskin or other leather, suede or skin-based coverings often found on older telescopes and instruments. It is obviously very durable, but does not give a further clue as to what use the scope was designed for. It could still be for naval or military (army or cavalry) use, or even for sporting/shooting hobby use.

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The telescope itself is 180mm or 7” long when closed, 42mm diameter, and 460mm long (just over 18”) when fully extended. It has a brass end cap fitting over the objective, and a winking cover that can be used to seal the hole through the eyepiece. There are no marks of engravings on the brass body.

Dating this example is also difficult, but it could be Edwardian or from around WW1.

Reference #300

Liverpool telescope

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This telescope is engraved ‘Wood, Liverpool’ – obviously a maker aiming at customers in the naval market therefore, and a good neat size suitable for a deck officer on-board ship. As such it is the typical size used by ‘Officers of the Watch’ (OOW), at 22” open, but uses three draws, compared to the classic single draw OOW telescope. The advantage of this is that when closed the scope is only 7.25”.

However the design shows that it predates the classic OOW telescope, and was built in the 1800s, ie C19th. First, it uses a wooden barrel, which looks like oak, and this is in very good condition. The brass fittings at the ends of the oak barrel are both secured with three screws, which are modern replacement screws, round headed, but they suit the scope. The originals were probably tiny countersunk screws: obviously these were not quite up to the job, which was fairly normal in the C19th.

The other design feature of note is that the eyepiece is a very square style, fixed to the first draw with three tiny grub-screws. In my opinion this moves the manufacturing date back to around the 1820s.

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Condition

The three draws are in perfect condition, as is the oak barrel. The only real problem in terms of condition is that the fourth lens in the first draw has a crack straight across the diameter, which is visible as you look through, but it does not offset the image seen at all, between the two halves.

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The maker?

The ‘Wood of Liverpool’ is presumed to relate to Benjamin Wood, who worked from 1819 till 1835 in Wapping, next to the docks in Liverpool, and then from 1829 onwards also in Bath Street, further along the dockside. Possibly the business was passed to his son, Benjamin Jasper Wood, who continued working until 1865. From 1847 to 1897 there was a different business that sold telescopes, believed unrelated, run by George Smart Wood, in Prescot Street, Lord St and London Road, amongst other places.

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Pocket Mahogany Telescope

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This is now a beautiful three draw small or pocket telescope, 41cms long when extended, and 142mm or 5.5” when closed. Overall diameter at the objective is 30mm. The barrel has a mahogany outer sleeve, and all the lenses are in good condition. The only things probably lacking are the objective end cap, and the slider in the eyepiece, which many people removed to make the scope easier to use. It works really well – the lenses are very good, possibly implying a good maker in the 20th century.

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This telescope was previously described to be in need of restoration, by the seller, but basically after cleaning the lenses it worked perfectly. There are no significant dents on the tubes – although there is evidence of some damage on the third draw. The barrel outer is a mahogany sleeve, in a thick layer over a metal base tube – which gives the unit good rigidity. This mahogany is too substantial (too thick) to be called a veneer, but it had a crack where the mahogany had shrunk on drying out, presumably. This was filled and stained before re-polishing the barrel, which now shines.

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There are no identifying marks on the tubes, so no makers name. It could date from anywhere between 1850 and 1940, but is probably from the 20th century, mainly judging by the good quality lenses and the good condition.

This one (#317) was sold on Ebay in April 2018, to a collector in Lincolnshire.

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Rowland of Bristol Multi-draw

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This is a delightfully compact six-draw telescope by Rowland of Bristol. Fully extended it is just over 23”, but compressed it only measures 5.25” in length, and 1.5” in diameter. So very easy to carry around in the pocket. The draws are brass, as is the barrel, which has polished brass shoulders, and then a central section which appears to have been coated with a red enamel/paint coating at some time past – much of this has chipped off.

DSC05739The only visible engraving is on the first draw, which says simply “Rowland Bristol”, so does not give any specific date information, in relation to the several generations of Rowland instrument makers in Bristol.

Richard Rowland operated from 50, the Quay in Bristol from 1792 to 1811, when the business changed name to (Richard) Rowland & Sons from 1812-1819. Then the business became “Edward & Thomas Rowland”, the two sons, at the same address (now called Broad Quay) from 1820-1840. Edward Rowland subsequently became the sole owner from 1842-51. The simple ‘Rowland’ of the engraving could honestly have been used in most of these periods, depending on how they wished to be known.

Telescope Design

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Multi-draw telescopes like this, in my opinion, did not appear until around 1820. There was the problem of obtaining supplies of the successively larger tubes needed, both for the draws themselves, but also for the sliders linking them. In addition, the standard four element eyepiece used two cartridges, which needed positioning with quite a large separation. This often meant that the first two draws were both used to support the cartridges, and usually the cartridge at the far end of the second draw had to compress inside the first draw tube, when the scope was folded up. The focus was also achieved by using the second draw moving into the third draw – leading to extra confusion for the user at times.

DSC05746This multi-draw has another, unique approach. The draws are relatively long, such that the second cartridge needs to be positioned half way along the second draw, for optimum performance. So the second cartridge is small enough to fit inside the first draw, except for the rear (ie objective end) lens mount ring. This ring is large enough to be caught by an internal shoulder in the second draw, half way along, which pulls the lens cartridge along into the middle of the second draw, when the scope is opened up. Ingenious!

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The sliding arrangement inside the second draw, to position the lens cartridge

Condition

DSC05745There are a couple of issues with the cosmetic condition: there is some damage to the eyepiece end of the second draw, which has a couple of dents. These can be seen in the photo opposite. Then the barrel paintwork is severely chipped, ie most of it is missing. It would benefit from a leather sleeve: hopefully a picture will follow with such a leather cover.

There is no end cap to protect the objective – this probably existed at some point.  The eyepiece has a rotating cover to seal the viewing window.

Accession number 278.

Re-covered barrel:

Black leather covering later added to the barrel.

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Negretti & Zambra telescopes

Negretti & Zambra has always been a name to conjure with, to aspire to, for me. Maybe because of the exotic name, maybe because they also made aircraft instruments. But regrettably most of their telescope models I have managed to purchase have resulted in disappointment! The first four models have not made it into these pages, mainly because they had problems functioning, ie they did not work well. So, in one last effort, I recently acquired a further N&Z model, of relatively conventional military design: this one also had a good traceable history.

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This new N&Z scope is a relatively standard design in the style of the Telescope Scout Regiment spotting scope of around WW1. It is a three draw all-metal construction, with the barrel being significantly tapered to house a large 2.25” diameter objective lens pair, covered with a sunshade. Whilst the scope is made of brass, this one, made in the 1890s, obviously needed a little bit of ostentation, or bling, so they plated the brass in silver, or a similar coloured coating. That way the scope would appeal to the landed gentry, the officers, who wanted to be seen in the field – and did not want the benefit of any camouflage!

And this telescope did appeal to one such officer and gentleman, his name is engraved on the first draw, and his initials are on the leather case. He was H B Smith-Bingham, and his chosen Regiment was that of the Wiltshire Imperial Yeomanry.

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The Boer War

In one week known as ‘Black Week’ in December 1899, British armed forces suffered three defeats against the Boers in South Africa, which led to the Government calling for troop volunteers to reinforce the regular Army in the campaign. The Yeomanry were supposed to be reserve forces, stationed at home, but a Royal Warrant asked standing Yeomanry regiments to provide service companies of approximately 115 men each for the Imperial Yeomanry, which was formed in South Africa. The Wiltshire Yeomanry provided two companies, which became the First and Second Companies of the First Imperial Yeomanry Battalion: with HB Smith-Bingham they arrived in March 1900.

There were various reports of his activities in South Africa during 1900, and then he was given a passage home in July 1901 on the ship the “Templemore”: he was then quoted to be a Lieutenant, serving with the 13th Imperial Yeomanry.

So the telescope probably saw service during the Boer War in South Africa.

The Wiltshire Yeomanry were formed originally in 1794, and was the first regiment in the British Army to be awarded the title of ‘Prince of Wales’s Own’ (entitling it to wear the Prince of Wales’s feathers as a badge). In 1884, it was placed at the head of the newly formed Yeomanry Order of Precedence by Queen Victoria.

The telescope

The telescope is 81 cms long fully extended, and 26 cms when all closed up. The sliders between the draws have felt linings, to run smoothly on the silver coating. Internally the first draw has two conventional cartridges, with two lenses in each. There are interesting minimal intrusion orifices in the barrel and the first draw, with black lining inside the tubes, to reduce reflections from the walls. There is a winking slider over the eyepiece lens, and the objective lens cap is riveted into the lid of the leather case, which is an interesting approach to not dropping or losing the cap!

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Above all, this one works, and works well. Quite a hefty lump to carry around on a belt, but better on a shoulder strap, or attached to the saddle of a horse. However with the limited field of view it would not be easy to use from horseback….

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This scope was Accession Number 316: bought December 2017, via Ebay. It seemed the supplier had not done any searches on the engraved name history, did not know what era it was from, and listed it in the Ebay section of “Barometers”. So they did not really do the unit justice.

N+Z History

Henry Negretti started work in 1840: he was born in 1818 in Italy, attended the London Mechanics Institute 1834-35, and seems to have been a glassblower and barometer maker, in various partnerships until 1850. Then he teamed up with Joseph Warren Zambra, and was in business at many different London locations, as an optical instrument maker,  until 1879, when he died: but the company continued into the C20th. It closed maybe in 1999, according to Wikipedia. The whole Wikipedia site shows examples of N+Z telescopes, predominantly these show black Japanned draws (the tubes that pull out), as this was their main style.

Three small telescopes: Dollond, Dixey, and A. N. Other

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These three telescopes are all small and easy to carry – they could be described as “Pocket telescopes” but you would need a deep pocket, since they are all around 6” long when folded up. All with three draws, they are the shortest units that can perform reasonably well, without going as far as having a multi-draw construction, a design that gets heavier and larger in diameter in the pocket. All three of these are the same sort of length when extended, 17 to 19 inches.

The interesting part is that these three illustrate several different aspects of design, and span around 120 years in terms of date of manufacture.

  1. The Dixey scope

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So named because it is engraved “C.W. Dixey, Optician to the Queen, New Bond Street, London” on the first draw. Charles Wastell Dixey worked there (at number 3) from 1839-1862 – so the Queen was certainly Victoria – and prior to working on his own he was in partnership with his Uncle George, and supplied George IV and William IV too. Those telescopes were labelled G & C Dixey.

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This scope is of a classic design, with two lens cartridges at either end of the first draw, each with two lenses in the Schyrle-Huygens eyepiece arrangement, which is the format generally adopted for telescopes after 1800. An interesting feature of this design is that the sliders mounting each draw are sized very close, making a good seal on the outside of the smaller tube. So Dixey added air release holes in each draw, to allow the air to escape as the scope is compressed. Because they are a good fit, he did not need to cut the full flap in the slider (that can be tightened using hand pressure) to enable later adjustment, that featured in many earlier designs. However he did make two parallel cuts in the slider on each side, creating a ‘double ended flap’ that can still be squeezed to tighten a little, if needed.

The different feature here is that the scope is all brass in construction, possibly reducing the maximum OD of the unit, compared to a mahogany barrel – it is about 1.25” OD round the Barrel, but 1.375” where the brass raised around the objective area. The outside of the barrel, instead of being leather covered, which became the normal covering later, is brass, with the surface scratched in a fairly irregular pattern, then coloured in a brown shade, to simulate the appearance of wood.

The objective is a dual element lens, in an achromatic combination, held in place using a threaded ring on the inner side. It would appear that originally there was a brass protective cover fitted over the objective, this seems to have been lost. The eyepiece has a captive sliding cover in the screwed on cap. This cap holds the first lens cartridge in place, which is a push fit into the first draw.

Accession Number 238

  1. The Dollond scope

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This Dollond is engraved ‘Dollond London x15’, all in capitals with the angular, heart shaped “O” letters. This dates it to after WW2, maybe in the 1950s. So it is 100 years further on than the Dixey: but still the same style of lens construction. The view through has the same sort of magnification, but the image is much bigger, and appears to give a wider field of view.

This could be down to the larger diameter lenses used in the eyepiece section: the three draws are altogether larger diameter and feel much stronger than those in the Dixey. The barrel of the Dollond is also larger by a little, measuring 1.625” OD. The largest, third draw is 1.375”, compared to the Dixey at 1”.

Where the Dollond scores comes later: it just feels right in the hands and is easy to use. This one has the brass barrel covered in pseudo leather – which is probably real….

Accession number 45 (a long time ago!)

  1. The Other One

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There are no markings engraved on this scope. It appears to be a standard three draw, small scope from the 1800 -1850 period, but is in remarkably good condition. This is maybe because of the substantial felt lined leather case that came with it.

It is a little unusual in that it has a brass barrel, rather than a wooden one, and this is coated with a veneer or similar covering. The surface of this veneer is textured, or roughened, to a sort of matt finish. It also has a sun shade over the objective, a third the length of the barrel, with a side sliding cover assembly over the lens that can be unscrewed. If the scope is used with this lens cover in place, but with the slider open, the diameter of the window opening onto the objective lens is only about 0.75”. The eyepiece cap screws into the top of the first draw, but this has an integral long parallel section, 11mm long, that prevents the first draw pushing further into the barrel.

The Schyrle lens system

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The three lenses in the Schyrle eyepiece design. The two lenses pictured still in the cartridges are there because their threads are too tight and difficult to remove. Both cartridges pictured have external threads on the bottom, to attach to the adjacent brass fittings.

It is inside the scope that the real differences become obvious. This was a real surprise, after the outside looked like a conventional early 1800s design. First the objective is a single lens, not an achromatic doublet. Then there are only three lenses in the first draw, making up the eyepiece assembly. These are equi-spaced, by about 6cms, and the lens closest to the eyepiece cap is in fact at the far end of a 3cms long cartridge, maintaining this large distance between the observing eye and the first lens. Plus there is a ‘Field Stop’ orifice close to this lens, on the objective side. This is a different eyepiece lens system to normal, it is a Schyrle lens system. This was supposed to have not been used after about 1750, since the achromatic objective lens and the Schyrle-Huygens eyepiece then took over. The Schyrle eyepiece was popular from the late 1600s to mid 1700s, and was developed by Anton Maria Schyrleus de Rheita, a Capuchin monk in 1645.

Others, notably Chris Lord, have suggested that Schyrle three lens systems were used on telescopes well into the early part of the C19th: the construction of this scope does seem to bear that out, in that it would appear to be of the style of the early 1800s. The internal connectors between draws are conventional, but close fitting brass to brass, such that there are no cut-outs that can be pressed down to tighten the connections up.

A characteristic of the Schyrle system is that the positioning of the eye along the optic axis is fairly critical, and equally any misalignment of the lenses in the cartridges – for example by cross-threading – makes it difficult to locate the image (ie sometimes it is difficult to use the scope without just seeing a grey blurr!).

The OD of the sunshade on this scope is 1.375”, and the barrel is 1.25”. The third draw is 1” diameter, like the Dixey. But as mentioned above, the window on the objective restricts its open diameter to 0.75”, whereas the Dixey objective lens visible OD is 1.125”, so gathering more light.

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Accession number 211

Conclusion

Three scopes, all very similar in performance, but all with their different features. All are compatible with the Ramsden small scopes from 1790, and the Andy McNab scope from the C20th. It really comes down to which ones are easiest to use and carry!

The Schyrle eyepiece system used in the third model is very unusual. It was seen once before in a James Chapman octagonal telescope in my collection, but this one really did date from the late 1700s. The scope described above looks to be a much later design, and in my opinion dates from the early part of the 1800s, maybe as late as 1840. A similar design of telescope, but one which uses the Schyrle-Huygens eyepiece system with 4 lenses in the first draw, and dates from around 1850, is the John Hewitson unit described earlier.

Hewitson scope (centre)

The Hewitson scope is the smaller, second one down: this photograph shows my first three significant purchases, back in 1992