Reference numberMS/929/1/180
TitleLetter from H. Clyde Snook, Victor Electric Corporation, Jackson Boulevard & Robey Street, Chicago, to James Mackenzie Davidson
Date13 June 1917
DescriptionAddresses Mackenzie Davidson with an enquiry regarding the use of shunt current for the excitation of the incandescent filament cathode of the Coolidge Tube. Describes the drop in voltage that their having difficulty with and asks for Mackenzie Davidson's advice on the subject.
Extent2 sides
Access statusOpen
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