Jacob Abraham of Bath is a renowned maker of telescopes, and up until this year I had never been successful in acquiring a sample of his work. He was active between 1809 and 1842, and was sought out as a supplier by the Duke of Gloucester and the Duke of Wellington in that time period. This model is a three draw unit with a mahogany barrel.
Admittedly the photos and description on Ebay may have put other buyers off, as all the screws into the wooden barrel were missing, so it was an assembly of loose bits, and the third draw seemed to have an extra brass ring around the circumference.
Close investigation suggested it had had quite a hard working life! But once cleaned up, with the wooden barrel polished and modern screws used to hold the two end pieces into the wood (using 3/8” long screws, cut down to about 5mm), the unit is optically very good. It seems the barrel has been shortened at some point, presumably because the original screws had been pulled out of the wood too often, and there was nothing left to screw into. This then made the largest draw too long to fit into the barrel when closing the scope together, ie it hit the back of the objective lens. So to stop this potential damage the owner, or his staff, soldered a ring of copper (very neatly) around this last draw, which prevents it being pushed fully home into the barrel.
A questionable eyepiece?
The engraving on the first draw is shown below, as well as the soldering holding the eyepiece cap in position.
As well as this mod on the third draw, the eyepiece cap has been soldered onto the end of the first draw. This cap is not necessarily the original, it may have been added to replace another cap damaged and/or lost. The shape of the cap, in terms of the tapering on the rear side, is just not what was fashionable or normal in the early 1800s. This was also the dubious aspect of a telescope discussed in an earlier story, the 8-draw Ramsden, where a correspondent pointed out that this was a fashionable shape in the late 1800s, particularly with manufacturers in France.
This soldered joint also means the first lens cartridge now seems to be permanently anchored in place, it does not appear to be removable any more.
Total length extended is just over 26”, and 8.75” when closed. The barrel OD is 1.75”. The draw tubes are actually in good condition, with only a few dents, in contrast to the other trauma the telescope has seen. The knurled ring on the fitting to the barrel does appear to have lost a segment of about 10 degrees, but still works fine. The missing segment can be seen on the photo above, showing the copper ring.
It is still an effective telescope, and from Abraham in Bath, as the engraving says. This is also a useful size for use in today’s world.
It is worth mentioning that there were other instrument makers by the name of Abraham in other towns. For example Abraham Abraham in Liverpool, Abraham Elisha Abraham in Exeter, G & C Abraham in Sheffield, and John Aburgham Abraham also in Liverpool. This Jacob Abraham started in St Andrew’s Terrace in Bath 1809-1811. From 1830-1842 he was at 7 Bartlett Street, Bath, but also opened an office in Cheltenham. From 1833-37 this office moved to be adjoining Mr Thompson’s Pump Room in Bath, presumably to catch all the gentry taking the waters. He also developed partnerships with other instrument sellers, to presumably sell Abraham units, from bases in Glasgow, Liverpool and Manchester.
Accession number #312.