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Communications Equipment of WW I

  • J-7-A - Flame proof straight key of US Signal Corps. Similar to J-5-A flame proof key yet equipped with a "winker light". The latter was loosely coupled to the aircraft transmitter output to provide for visual indication in noisy environment of the airplane. The flame proof keys of J-5/J-6/J-7 family were used to operate spark-gap transmitters in hazardous environments like aircraft cabin filled with fuel perspirations. These keys were in use during and after WW1. Our sample was made by L.S.Brach Mfg.Co. of Newark, New Jersey, in 1921.

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