Anti-Aircraft Artillery Range Indicator, US Navy, Mark 1, 1944 Cold War plotting its change in location

plotting its change in location with the timed plotting mechanism to determine aircraft course

which told him how far he was from the point of touch-down

This indicator

This item has a serial number prefix of AF-52

The B-7 Engine Gage Unit displayed 3 metrics with one instrument:  Oil temperature (from 0-100 deg C)

Anti-Aircraft Artillery Range Indicator, US Navy, Mark 1, 1944 Cold War plotting its change in locationHere is a WWII USNavy Range Indicator, Antiaircraft Gunnery, Mark 1. It is a hand held finder used to ascertain the range of an enemy aircraft based upon its known wingspan. They were only as accurate as the observers knowledge of aircraft identification and of course, how rapidly he could spot, identify, track and calculate the information to pass this on to the gunners (usually manning 20mm to 40mm guns or a 3" gun mount typically used on auxiliary