VINTAGE MILITARY ROTARY TRANSFORMERDynamotor Type H.T.31
H.T 31 is 31 WATT No.1 (REC)Military Stores Code ZA.15147
Dating back to the WW2 ERA it was manufactured to provide high voltage to power military radio equipment, most famously used to power receivers like the WIRELESS SET No.19 or WIRELESS SET No. 22 

You feed on the input side 11.5v typically from a 12v batteryAs it spins it generates an output of 250v at 125 milliamps.Continuous power delivery rating of 31 Watt.
The HT was essential to run the valves inside vintage military radios.
The ZA stores number confirms it was officially ARMY SIGNALLING EQUIPMENT.
On the video I have posted you can hear the distinctive whining sound as the motor spools up.This has not been fully stripped by myself or lubricated, so may need to be done to preserve it.
I have a few military radio items for sale such as aerials but nothing elseI don't want swaps or offersNo scamsPlease only bid if you really want it and can pay on the auction ending
Postage is included to mainland England onlyOther locations, Countries, please ask before bidding