Auroscope (inspector auris), cross section, 1825

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Auroscope (inspector auris), cross section, 1825. Auroscope (inspector auris) in cross section. Designed and drawn by Thomas Buchanan. Key to components: A) Globular lantern of block tin, with a large door on one side. B) Iron tube, inside polished and secured to lantern. C) Shorter tube made to screw on the end of the tube B a) Double convex lens, about 3 inches focus, and 3 inches diameter. b) Concave lens to collect rays emitted by d, and transmit them to a, its focal distance the same as a c) Double convex lens less diameter than a, concentrates the rays at a distance of about 7–8 inches from its surface. d) Candlestick equidistant from a and b e) Head of lantern, with small oblique holes to let out candle smoke. ffg) Pieces of tin prevent rays escaping in these directions. h) Piece of iron into which tube B is fixed. i) Standard made of iron. Bottom is circular and about a foot in diameter. Instruments. Examination. Contributors: Thomas Buchanan. Work ID: x8c2ycnb.

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