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Showing 21–40 of 53 items
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Describes the tests JH made on a small glass prism of not very high quality, which JH has left at the Royal Institution.
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Hears that the Board of Longitude is to be dissolved; it will therefore be necessary to seek a new source of income for the continuance of the Optical Glass experiments. Will be guided by MF's wish whether to continue the experiments. Charles Anderson has showed him curious experiments with the fusion of Fluor with clay.
The furnace is breaking away at the top, and he encloses Joshua Ramsay's estimate for its repair. Thinks the present a suitable time for the repairs. Would JH speak to the Council?
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Sends MF some older samples of imperfect glass. Talks about the way in which different kinds of glass should be layered in lenses.