Measuring Triangle (Meßdreieck) for German MG 34 and MG 42 Machine Guns Ki-61 Tony Turning the set course knob

Turning the set course knob rotates the course dial to bring the desired track figure under the course index

25 inches diameter and ~3 inches deep

A few pages have a pencil marking crossing out the section and some yellow highlights

TO 30-100D-1 dated Jan 1944

Measuring Triangle (Meßdreieck) for German MG 34 and MG 42 Machine Guns Ki-61 Tony Turning the set course knobHere 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