An item used for spotting enemy fire, detecting azimuth and deflection errors in bursts of fire for flash ranging, terrestrial and celestial observation, and for accurate measurement of horizontal and vertical angles by the use of reticles. It may have a single or dual optical system(s), utilizing a straight or offset (raised) line of sight. It is supported by a tribrach having a leveling plate with adjusting screws, circular and/or tubular level vials, azimuth and elevation controls, and the like. It may be mounted in a tripod or groundshelf mount, and usually includes accommodations for a light, instrument.
NSN 5920-01-444-4082
NSN 2925-01-386-7392
NSN 5999-01-295-3110
NSN 6220-01-363-9713
NSN 5915-01-624-7529
NSN 5999-01-623-5126
NSN 6685-01-359-5732
NSN 6320-01-177-3192
NSN 5985-01-448-8472
NSN 6220-01-535-6968
NSN 5999-01-455-9402
NSN 5920-01-263-7012