Aldis Signal/Spot Light Kit and Lenses Ref No 5A/823 RCAF 1940-43 KC-97 made by the British aircraft

made by the British aircraft instrument manufacturer Smiths

perhaps evidence of its use in the US Navy's version of the B-17

The Master Indicator was part of a 5 module system combining the functions of a directional indicator and a magnetic compass

the Avro CF-100 Canuck (see photo of CF-100 instrument panel showing its location)

It indicated outside air temperature from -45deg to +45deg C

Aldis Signal/Spot Light Kit and Lenses Ref No 5A/823 RCAF 1940-43 KC-97 made by the British aircraftHere is an original WWII era Aldis Signal Light Kit as used by the Royal Canadian Air Force. The light was used either as a spotlight (by squeezing and holding the large trigger) or as a signal light (by squeezing the small trigger, which altered the angle of the projected light) to transmit Morse code. Atop the light housing is a tubular sight to ensure that the light is aimed at the intended recipient to ensure accurate interpretation of any Morse