WW1 STERLING SPARK TRANSMITTER
Transmitter used by aircraft for 'spotting' the fall of artillery shells, the operator could tell the gunners if they were on target.
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The transmitter and Morse key were totally enclosed lest a spark ignite petrol vapour in the cockpit.
The transmitters were developed by the Royal Naval Air Service and the makers were The Sterling Telephone Company. On the top of the unit should be an ammeter, unfortunately this item is missing, the museum is currently searching for this item.