Measuring Triangle (Meßdreieck) for German MG 34 and MG 42 Machine Guns A4 Skyhawk All pages appear to be

All pages appear to be in place and intact (no tears or missing pages have been identified)

Heinkel HE 111

This 60-page book published in 1970 covers the development and operational history of the Grumman TBF/TBM Avenger Torpedo Bomber

Here is a combination Airspeed Machspeed Indicator

Measuring Triangle (Meßdreieck) for German MG 34 and MG 42 Machine Guns A4 Skyhawk All pages appear to beHere is a highly unusual and complicated instrument a German Medreieck (Messdreieck), or measuring triangle, used by MG 34 or MG 42 Machine Gun crews during WWII. The measuring triangle was used to optimize the fire efficiency of machine guns and to calculate distances. It may also have been used to support artillery aiming. We found a chatroom with the following information from "Roger": It resolves trig functions, but cannot directly calculate where