A Ross London single draw chromed brass spotter telescope. Pattern 373, serial number 91999. Broad arrow, No. 46. Good working condition. This telescope was probably manufactured in early 1900s, or WW1.
Magnification: estimated around 15x
Objective lens diameter: 45mm
Eyepiece diameter: 20mm
Single draw chromed (silver/nickel plated) brass image focusing tube.
Fine focusing at rare end of tube: – /+ 5
Silver plated front tube and retractable sun visor.
Telescope length when fully extended: 55cm (21.6 in.)
Telescope length when compacted: 33cm (13 in.)
Main body diameter: 48mm
Leather bound on the principal barrel tube
Weight: approx. 756g
This telescope is in very good working condition with sharp images.
No damage or obvious dents to the scope body and the focusing tube glides smoothly.
No damage to scope lenses and no fungus on the internal lenses. All internal lenses have been cleaned and the telescope gives a very sharp image. There is a tiny white dot on the front lens, but this is hardly visible and does not affect the performance of the scope in any way. Otherwise wear and tear to the leather and to tube surfaces are normal and appropriate with age and services.
Please see photos for further details.
Ross & Co, London – Ross (optics) was founded by Andrew Ross (1798–1859) in 1830. During Andrew Ross’s lifetime, the company was one of the foremost lens manufacturers. After Andrew’s death in 1859 his son-in-law John Henry Dallmeyer left the firm to establish his own optical company in 1860 and the company was run by Ross’s son, Thomas, and became known as Ross & Co. By the 1890s was also making Zeiss and Goerz lenses under licence for sale in the UK and the British Empire. Ross patented a Wide Angle lens design and Zeiss took this further to produce their EWA Protars, before WWI Ross and Zeiss worked quite closely together, but at the outbreak of War the British Government put Ross in control of the newly opened Carl Zeiss binocular and optical factory in Mill Hill, London. Up until the mid-20th century Ross & Co continued to produce lenses, as well as binoculars and epidiascopes.
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