Edgerton Lab Notebook T-1, Page 14:
October 19, 1927
- Page start date:
- October 19, 1927
- Content type:
- diagram,notes
- Transcription:
- I connected up the outfit the same as yesterday except I used a Bawer tap on the anode transformer (385 u). This was done in order to cut down the power required from the a.c. supply since apparently the cutoff occurred at 1 amp rectified C.C. Also slide wire resistance were substituted for the heavy stove resistances used yesterday, the values of current and the % of voltage were about the same as before.
When I tried to regulate frequency I found that the cuton and cutoff occurred about at a difference in frequency of .5 cycle. This made speed regulation terrible!!
Connecting in the stoves which were used in the previous test the regulation was again o.k.
Looking for differences between the two resistances it is observed that the slide wire resistance is wound on an iron tube (enameled) which gives it considerable inductance.
To check this guess, inductance was connected in series with the stoves. The cutoff varied with the manner of approaching as was noticed when the slide wire resistances were used.
With load on the A.C. generator no change of frequncy was evident. Sudden switching of 1 1/2 times full load on the A.C. generator gives a frequency curve similar to the one sketched. Also independent of dc or a.c.c voltages.
- Keywords:
- anode transformer; cutoff; cutoff voltage; frequency; regulate; resistances; speed regulation
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