[Boatanchors] Magslips/selsyns transmitters and receivers/synchros (?)

[CLIVE COLLINS]

Good day gentlemen,
Does anyone have for disposal a pair of the subject devices please?
I need to indicate a beam position into the shack and this seems to be the simplest way.
>From the handbook, I gather that I need a transmitter and a receiver with an ac power source as an excitation source at 50 volts.  If this is inaccurate, please corerct me as this is a whole new field for me.
many thanks in advance and all good wishes,
 
Clive GW3WEQ