Cylinder Head Temperature Indicator, Type B-7, US Army Air Corps Pre-WWII B-25 Although the image of the

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

25 inches diameter by ~2 inches deep

It is similar to the more common AN-104 Mast Antenna used in later aircraft versions

UK) aircraft not typically seen over Europe

Cylinder Head Temperature Indicator, Type B-7, US Army Air Corps Pre-WWII B-25 Although the image 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