Edgerton Lab Notebook T-1, Page 44: September 16, 1930

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Page start date:

September 16, 1930

Content type:

notes

Transcription:

I constructed a stroboscope to be used for observation of the electrical angle of displacement of the generators of the 15 mile falls development of the New England Power Company, located near St. Johns [--?--] and East Barnet Vermont. Previously I had connected up a G.E. single phase tube in the lab to measure the angle of a new induction machine Mr. Spencer brought Mr. L Thurston (movie camera man) over and he took some shots with a 1.9 lens and 12 frames a second. He said that the light was sufficient for photographic purposes. (Panchromatic film was used.) On thursday the 4th of Sept I went to the 15 mile falls plant. A platform was constructed so that it cleared the motor of a #2 generator by 1/2 an inch. Upon this was mounted the thyratron. Below it was a sheet metal part which was part of the fan mechanism of the motor. Upon this were accurately located 52 white lines (the machine has 52 poles). Adhesive tape arrow heads were stuck to the lines in order to make the photographs have more contrast. The windage was terrific and combined with a cold spell made adverse operating conditions for the thyratron with the circuit that I was using. The grid transformer could not supply enough voltage to trip the circuit. After experiments done I got a 110-440 volt pot transformer and

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