Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography (1899)

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78 LIVING PICTURES. used some form of intermittent mechanism giving one- tenth movement and nine-tenths rest. The arrange- ment adopted in U.S. Patent No. 589,168 is now seen to be that shown in Fig. '//, wherein the fihii passes from spool A to spool B, being drawn along by a sprocket-wheel driven from the pulley C. The film would move continuously were it not that the rotation of the sprocket-wheel is periodically checked by the interaction of two toothed wheels, one (D) situated on the main shaft, and the other (shown black in the illustration) beneath the sprocket-wheel and on the same axle. To save strain, the pulley runs loose when the two wheels are locked together as shown in Fig. 78. The right-hand wheel is just about to allow the other to move one stage, the tooth passing through a slot (Fig. 79). So soon as this tooth makes its escape the wheel E turns and carries with it the sprocket-wheel, and therefore the band. When a Pn-. ^^ picture-length has passed, the next tooth on E strikes the surface of D, and remains locked until the next slot comes round and permits another tooth to escape. This machine would not perhaps be of great importance were it a recent invention, but it must be remembered that it was filed six years ago, on the same date as the Kinetoscope specification, and these two documents make mutual cross references to one another. When, therefore, it is seen that the long- concealed document is furnished with comprehensive claims, including the perforated film, views in series from one point of view, and many other equally general ideas, some point is lent to the persistent rumours that Mr. Edison is about to assert his " rights." The invention not having been patented on this side of the Atlantic, the question hardly affects the English