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Scientific American, Vol. 90, No. 3 (1904) (1904)

leaf 4

An illustration from Scientific American, Vol. 90, No. 3 (1904), 1904, leaf 4 — n any desired position of the touching the edge of the body strike the screen. This frame is provided with three pencil holders or “plot- drawing plane. outline therefore is the periphery of the base of a ters,” as they are called, which are movable in the The luminous screen, which also carries… … be done by meas- There ‘is only © 1904 SCIENTIFIC AMERICAN, INC

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