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THORN

0 - 50R THORN RHEOSTAT PANEL DIMMER SWITCH VINTAGE AIRCRAFT LIGHTENING fd4g12

0 - 50R THORN RHEOSTAT PANEL DIMMER SWITCH VINTAGE AIRCRAFT LIGHTENING fd4g12

£45.00
£45.00
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0 TO 50 OHM THORN RHEOSTAT 

Manufactured to military specifications by Thorn in the UK, this is a 0 to 50 Ohm variable wire wound resistor / rheostat. It is believed this exact type was used in the RAF Lightening aircraft. NSN is 5905-99-525-4345. 

These were a modular series of rheostats made by Thorn to be used for aircraft and similar lighting.  This one has 2 x 100 ohm modules connected in parallel, with a switch module. So a switched 50 ohm unit.

  About the Thorn dimmer switch series:  "Four bolts made to the correct length pass through all items of the stack and clamp the stack together to the front plate. Shaft rotation is 90° with firm end stops. A friction system keeps the shaft in position during flight. The rheostats have a purposeful open-circuit section at the very lowest setting, just for the last few degrees of shaft rotation, thus ensuring no current flows to the lighting circuits when fully dimmed. Added to the end of the stack, it is common to see a switch. This switch will open when at the last few degrees of shaft travel, and is closed at any other shaft angle.

Quite rare now this is brand new and unused vintage stock, not seen the light of day since been packed in 1970.

Behind panel dimensions at maximum points including bolts etc are 55mm long x 42mm width, standard 0.25 inch diameter shaft x 30mm long.

Priced and supplied each exactly as shown in the photos.
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