Edgerton Lab Notebook T-4, Page 19: July 26, 1932

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Page start date:

July 26, 1932

Content type:

notes

Transcription:

tube had a positive volt-ampere characteristic. It did not as it blew the circuit breakers. I later checked this by paralleling a second resistor with the ballast resistance. The current jumped from 4 amps to over 10 and the voltage dropped from 150 to about 110 or 125. Lights of this type give out a lot of light for a short time. In 10 seconds or so the illumination can be kept very high. The procedure last night was to heat the tube about 4 minutes until the tube drop was 150 volts. Then the switch was closed and the 10+ amps gave considerably more light for a duration of about 7 seconds before the tubes went out because of too much heat.

Keywords:

tube

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