Letter | Published:

Galvanometer Amplification by Photo-Cell

Nature volume 134, page 289 (25 August 1934) | Download Citation



I REFERRED recently1 to the use of a Weston photronic cell arranged differentially for amplifying galvanometer deflections. It has been found since, (a) that a Bernheim cell is several times as sensitive, and (b) that there is considerable advantage in cutting the cell into two halves, and opposing the two halves in parallel. In the previous arrangement the con ducting surface only was divided, and contacts made to its two halves: the two half-cells were thus opposed in series. With the new arrangement (i) there is at least twice the current in an ordinary low resistance galvanometer for a given difference of illumination, and (ii) for equal illuminations of the two halves there is no current.

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    NATURE, 133, 685, May 5, 1934.

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  1. University College, Gower Street, W.C.I. July 27

    • A. V. HILL


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