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Scientific American, Vol. 69, No. 21 (1893) (1893)

leaf 7

An illustration from Scientific American, Vol. 69, No. 21 (1893), 1893, leaf 7
will all be at least 300 feet from the nearest in every house. The movable night lamp, which memory of Hon. Charles E. Dudley, the original gifts road, and more than a mile from the nearest railroad. operates at an expense of but one cent a night, pre- The horizon is unobstructed in all directions… … of the stairway, and supports a pulley, C. DIAGRAM gheny, Pa. The length of this telescope is 15 Two cables, kept parallel, run from the top to feet when arranged for the customary use, but within less than twenty minutes at any time this tele- the bottom, and are fixed to the point, B, and are…

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