Cylinder Head Temperature Indicator, Type B-7, US Army Air Corps Pre-WWII B-25 Here is an interesting WWII

Here is an interesting WWII US Naval gunship artifact: a Gun Train/Elevation Meter

MODEL OF THE YEAR 1944

It is a hand held finder used to ascertain the range of an enemy aircraft based upon its known wingspan

Although the image of the instrument panel shows an instrument without the tripmeter reset knob

Cylinder Head Temperature Indicator, Type B-7, US Army Air Corps Pre-WWII B-25 Here is an interesting WWIIThis is a pre WWII Type B 7 Cylinder Head Temperature Indicator as used in aircraft of the US Army Air Corps before and during WWII. The indicator measures the temperature of the cylinder head via thermocouple from a single engine, from 0 350 deg C. The B 7 indicator had an integral light source in the upper right corner, although the bulb is missing from this example. Made by Weston, part number 86884, with a serial number prefix of AC 39, evidence