Abstract
THE use of the rectifier photo-cell to amplify galvanometer deflections is now well known; but I have never seen any explicit mention of the fact that, with the customary set-up1, the deflections of the second galvanometer are not in general proportional to those of the first. The discrepancy arises because the area of the photo-cell illuminated changes as the deflection of the primary galvanometer changes.
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References
A. Y., Hill, J. Sci. Instr., 8, 262; 1931. NATURE, 133, 685; 1934. R. V. Jones, NATURE, 133, 872; 1934. J. Sci. Instr., 11, 302; 1934.
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FOLLETT, D. Galvanometer Relays. Nature 135, 187 (1935). https://doi.org/10.1038/135187a0
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DOI: https://doi.org/10.1038/135187a0
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