Boresight Telescope Mark VIII Mod 6 BOAC This Soviet/Russian aircraft instrument appears

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

using a 10

part number 1559-010130

made by Waltham Watch Co

probably for a weight balancing system prior to this being an automatic process

Boresight Telescope Mark VIII Mod 6 BOAC This Soviet/Russian aircraft instrument appearsDesigned 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,