This 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.
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.
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.
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.