Cylinder Head Temperature Indicator, Type B-7, US Army Air Corps Pre-WWII B-25 was a component of the

was a component of the SCR-280-A Radio Compass System

The C-14 Sensitive Altimeter displayed altitude using 3 pointers

it has a knob to adjust for barometric pressure

UK) aircraft not typically seen over Europe

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

Cylinder Head Temperature Indicator, Type B-7, US Army Air Corps Pre-WWII B-25 was a component of theThis 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