91637

Optical spotting instrument

91637 Description

Mark 4 tactical spotting scope .

Properties of 91637

Focusing Type:
Adjustable
Optical Device Type:
Lens and prism
Magnification Type:
Variable
Scale Markings:
Provided
Part Name Assigned By Controlling Agency:
Mark 4 tactical spotting scope
NSN:
1240-01-618-2712
Description:
Spotting Instrument,optical
Cage Code:

Definition Optical Spotting Instrument

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.

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Last modified 05/05/2024