. Transactions of the Society of Motion Picture Engineers (1921) . Fig. 3- -From Mechanigraph of Motor-driven Tire Pump showioperation of the Tire Pump in action. ng every 60. Fig. 4Mechanigraph of Peter Coopers First Locomotive and proper conditions, just as the stage and the photoplay havebeen able to do in their field. Thus mechanigraph representations ofthe first steam engine (Figs. 4 and 5) and the early forerunnersof the bicycle. (Figs. 6 and 7) show these mechanical inven-

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