Boresight Telescope Mark VIII Mod 6 BOAC using a 10

using a 10

The instrument looks terrific and would make a wonderful display piece

25 inches diameter by 5 inches deep

This Soviet/Russian aircraft instrument appears to be for setting an airspeed between 70-220 kilometers per hour

According to the RAAF 346 Types and Locations of Instruments in RAAF dated 1945

Boresight Telescope Mark VIII Mod 6 BOAC using a 10Designed for naval ordnance, this Boresight Telescope, made by Spencer Lens Co., was used to align the bore of a naval gun to its distally mounted gunsight along the specified firing range. The telescope was positioned within the bore of the gun during the sighting procedure, to align the line of firing with the line of the gunsight, intersecting them along the specified firing range. Used for sighting 3" 50 guns. The case measures 12. 5 inches long,