Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 174
um line.The movement of the spot of light can either be photographed on a mov-ing plate or film or observed in a rotating mirrror. When the varia-tions are periodic a vibrating mirror with the axis at right angles to thatof the Oscillograph and operated by a synochronous motor will reflect thespot… … Fig. 144. DuDDELL Oscillograph. 170
Electric apparatus and appliances · Equipment and supplies
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