is de- duration of the motion ob- signed for medical uses, gives served, whatever be the dura- more or less frequent inter- tion of the latter, from a frac- ruptions in a unit of time. By means of a very simple tion of a second up to one or more seconds. There is no- modification, it has been able… … as to appear before such or Fig. 2.—A, covering plate carrying the objectives, shutters and electric gearing ; B, thirteen-wire contact; C, camera ; D, focusing rack. Lastly, it may be useful in such a concentric circle, thus Fig. 3.—A, clockwork case ; B, brush ; C, ivory disk ; D, one of the…
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