Abstract
LONDON. Physical Society, February 24.—Prof. A. W. Rücker, F. R. S., President, in the chair.—Mr. Everett, junr., read a paper On a new and handy focometer, by Prof.J. D. Everett, F.R.S., and exhibited the instrument described.
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Societies and Academies. Nature 47, 500–504 (1893). https://doi.org/10.1038/047500a0
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DOI: https://doi.org/10.1038/047500a0