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Page start date:
November 15, 1927
Page type: diagram, notes
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A vacuum tube oscillator was connected up to oscillate at 120 cycles. Its output was connected across the grids in parallel.
This arrangement gave a variation of the thyratron output with phase angle between the independently oscillating tube cirucit and the alternator.
The variation is as sketched in this curve. [diagram]
Notice that at 90º the full on occurs. This is because the 120º grid potential is positive because of the second wave coming in.
in order to connect back into the field circuit it was necessary to change the d-c lighting system to a-c in order to avoid a short circuit.
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