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EFFICIENCY mechanisms, simply because neither eye nor mind can follow them in their rapid action. The projection of such pictures on the screen gives most valuable information to guide constructors and manipulators of engineering constructions. It is fair to say that excellent work could be done in the study of the action of the mov- ing picture machine by ultra-rapid photography. Familiarity does realize the wonder of what they arc doing. Much could be made not breed reverence as a rule, and it is probable that few operators clear to the student of projection if the process were applied as 1 here. In the internal combustion engine the all important thi: the cam action, by which the valves arc opened and shut. The shape and timming of tin what makes a good or bad engine. The rejection gives the clearest cnligh* <>n the work of these members of the n question. The relation of their ! shutting t! to the positions of the pistons instructive if once known. The screen can be made to tell the story in projecting the action on the screen. The magnifi- cation as we slowness of the action is an element in the ly« PHOTOGRAPHY HY THE ELECTRIC SPARK The use of the electric static discharge spark to take pictures is a very refined piece of work. At present the mechanical camera is credited with one hundred and sixty pictures a second. This removes the work la' to the open field of e photog- raphy. Now it is >aid that there is a prospect of the rate of ex- posure being brought up to one thousand pictures a second and this on the standard film of the regular projection machine. In this way the study of rapid motion would be made most practical and s could be xtended. Much of this applies more to the photography of objects than to projection. But the two work together, and it is hardly to be reckoned that we have strayed from our path in noticing this in- teresting phase of the work of the projecting of pictures. It would seem certain that much valuable work will be done in the future in these lines, so that the screen will be a very serious thing in the engineering and technical world. 298