Author Topic: Very Early Automatic Light Control From 1937  (Read 386 times)
Mr. Orthosilicate
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Very Early Automatic Light Control From 1937 « on: February 12, 2020, 05:12:49 PM » Author: Mr. Orthosilicate
I found this old brochure that shows a device to control lighting for school classrooms. Itís very large and bulky, and contains a phototube. I had no idea they tried to do this so early on, with such large equipment.

https://archive.org/details/AutomaticControlForSchoolroomLightingTheModernClassroomIsEquipped/page/n3/mode/2up
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lights*plus
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George Liv Photo


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Re: Very Early Automatic Light Control From 1937 « Reply #1 on: February 15, 2020, 02:52:45 PM » Author: lights*plus
I'd like to know how a radio tube works as a photocell.
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wide-lite 1000
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Re: Very Early Automatic Light Control From 1937 « Reply #2 on: February 15, 2020, 06:17:20 PM » Author: wide-lite 1000
The system has 2 tubes : A "photo tube" that works as the photo cell and the "radio tube" that works as an amplifier, presumably boosting the signal from the photo tube to control the contactor unit .
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