Bimetallic Mirrors Made by Electro-Deposition

Physics

Scientific paper

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Scientific paper

APROPOS of Mr. Cowper-Coles's exhibit at the recent soirée of the Royal Society of metallic searchlight reflectors made by the electro-deposition of copper upon a silver film chemically deposited on glass, it may be interesting to mention that some forty years ago (I think in the year 1865) I spent a considerable time in experimenting in the same direction. My object was to make a true ``flat'' for the second reflection of a Newtonian telescope, with silver surface as bright as that in contact with silvered glass and without degradation from the true figure of the glass. The last condition I was unable to fulfil. It had been rightly judged that the outside surface of the silver film used by M. Foucault could scarcely have the truth of figure or the brilliancy of polish of the glass on which it had been deposited, hence the desirability of the object sought.

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