Philosophical transactions of the Royal Society of London (1666)
Royal Society (Great Britain), United States. Patent Office. Scientific Library, former owner. DSI · London : Royal Society of London · leaf 418
with iron, that it may bear to beexposed close to the bars of a chimney fire. C, The concave mirror. D, The plain mirror. E, The lens. No. 1, The thermometer in the focus of the lens.No. 4, The standard thermometer. F, A circular opening in the front plate AB, for admittingthe rays of heat to fall…
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