This is a 3-draw Dollond with a wooden barrel, a medium sized telescope around 20” long when extended. It was acquired in August 2017, as ref #313, and is frankly the same as two previous purchases, those with Accession numbers #193 and #98.
The design is classic for a medium sized scope, very similar to the early Ramsdens or the Watkins & Hill described on the last page – although earlier than that one, dating from between 1810 and 1820. The major difference in the Dollond is that the lens mounting positions in the first draw are at either end of the draw, and then at two places where the draw is split to allow access to these lenses. The photo shows the lens mounting positions along the first draw:
The reason this design is attractive enough to buy three models is that the Dollond optics are superb. Regrettably for Dollond, the mechanical construction is not so robust: the draw tubes are relatively thin, so examples can have damaged tubes that are difficult to move, and the joints between the tubes are not soldered in place as well as is achieved in later Dollond models, or other supplier’s units. The scope ref #98 had these poor joints, and no eyepiece cap. So it is basically used as a source of spare lenses. Ref #193 was complete, although one draw was stiff and the mahogany had a crack along the length, but it worked beautifully: this one was given away.
Why buy this third model?
Ref #313 was bought to replace #193, and is complete with end cap and slider in the eyepiece, and with original screws in the barrel. The mahogany barrel has a thick layer of French polish over the original polish, and looks almost black. It does have one mechanical problem, the shoulder of the slider on the second draw is only a press fit in place.
It is interesting to note that the design of this slider and shoulder was a Dollond Patent as well, described first in around 1780 apparently! It follows good mechanical principles, and positions the mounting thread around 1” inside the tube that is the next larger on the scope. At the flange ring against the tube end, there is a shoulder making a tight fit inside the larger tube, giving the joint two separated mounting points – and so there is less likelihood of a wobble developing at the joint.
Regrettably no info is available. The scope was bought from a dealer in Littlehampton, West Sussex, in August 2017 – an Ebay Buy-it-Now item that was suddenly withdrawn, so I chased it. Presumably there was a failed sale, or other interest.
Accession number 313.