Well in my unpacking I came across this old piece of history, a one-inch diameter Magnesian. It was made g-d knows when. This device has only four pins, which threw me for a loop. I did not understand how it worked until I found figure 2. Normally a Synchro is a five lead device
where you have three leads for the Stator and two leads for the rotor, on which power is applied. What they did is like a one-cheek-sneak.
They still have power across the Rotor at pins A&B. But the third leg of the Stator is now grounded.
figure 1 ![]() | figure 2 ![]() |


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