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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 tra…