For consideration is this rare telescope in need of repair / restoration:
A four draw brass telescope with a mahogany barrel measuring 33 cms long when closed and 109 cms fully open, with a circular brass plaque fixed to the barrel along with the words, ‘By The Kings Royal Patent’, and underneath a large brass plaque fixed in place with ‘Table for computing Horizontal Distance of Objects’ along with engraved equations. Also an ivory note pad (damaged). The double lens objective is 2″ diameter; one lens is cracked. The fourth draw is engraved, ’66. C. Rands, Patent, Made & Sold by Wm. WATKINS. St. James’s Str. London’. Also engraved is a ‘Mean Val of Divisions’ with a small engraved equation.
The telescope works fine as a standard telescope but missing is the micrometer vernier scale, magnifyer and the internal sights, so the telescope will not operate in its present state as a trigonometry instrument, but is still good for normal viewing.
The four draw tubes are damage free and operate smoothly. The mahogany barrel is free of cracks but has normal wear / scratch marks commensurate with age. Dent to eye piece cup.
Designed by sometime school teacher, book seller and surveyor Cater Rand (1749-1825), in 1799 the ‘Rand Patent’ Telescope was, according to the patent, designed for measuring distances and the extension of objects at sight. By moving the two pairs of crosshairs together and apart, the distance of the object can be found from the angle of the crosshairs in a single observation — provided the size and height of the object is known. If, on the other hand, the distance is known, the size and height of an object can be found using two observation points by means of a micrometrical adjustment device.
Ask the Dealer
I live in Lancashire (U.K.) and have been a dealer and collector of scientific and nautical instruments for a number of years. My stock has included some fine items from museums and colleges, which were surplus to their requirements. I occasionally purchase some interesting items from abroad, having established some reliable sources.