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  1. This was the Western Electric type I vacuum tube and was very generously loaned by that company.

Other (1)

This was the Western Electric type I vacuum tube and was very generously loaned by that company.

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Figures (2)

F. 1
F. 1

Circuit diagram.

F. 2
F. 2

Curve 1: variation of voltage with time; Curve 2: with small output current; Curve 3: with larger output current.