Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 62
Fig 3 856.—Powers motion picture machine or Cameragraph; view showing lamp house andmachine with covers removed, exposing mechanism. 2,716 HAWKINS ELECTRICITY Illumination for Motion Picture Projection.—Both gasand electricity are used to produce illumination for motion pictureprojection. The… … Fig. 3,857.—Powers intermittent movement. The driving element is a diamond-shapedrevolving surface which projects from the disc, the latter being attached to the mainspindle or shaft. A locking ring for the driven element is also formed on the face of thedisc in such relation to the diamond that…
Electrical engineering
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