Quote:
Originally Posted by Ed Storey
To be honest Bert, I have not looked into it too deeply and always thought that the W/T meant that the vehicle's electrical system had been supressed so that any radios fitted to the vehicle could be operated without any interference.
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It was a generic abbreviation for 'Wireless Transmitting sets' going way back to WW1.
https://www.iwm.org.uk/collections/item/object/30005728
As Ed pointed out - it appears that in military speak - W/T was also used in a different context: to describe the electrical bonding of the metal components of aircraft and vehicles in order to lessen interference.
Some military vehicles had screened ignition systems , so maybe this was another reason for the W/T marking.
I have seen the following described in many older publications:
R/T = Radio Telephony (voice communication)
W/T = Wireless Telegraphy (CW mode: Morse)
So it depends on whether you say: Toomartow or Toomaytow