Practical cinematography and its applications (1913)

190 PRACTICAL CINEMATOGRAPHY character and of interest only to persons con- cerned with mechanics. But to these they are very important indeed. The experiments which have been completed by Dr. Fuchs have thrown much light upon a difficult engineering problem. They have served to answer questions affecting the design of the hammer and its most economical efficient operation which would otherwise have been insoluble. From the public point of view the films possess no interest whatever, inasmuch as the subject is illuminated and photographed in such a way that only the features of technical interest are brought out strongly upon the film. Another interesting and profitable province of the cinematograph is that concerning ballistics. This has been worked out by Monsieur Lucien Bull at the Marey Institute with his camera capable of taking two thousand pictures per second under the illumination of the electric spark. While this investigator did not apply his invention directly to ballistics he indicated the manner in which such work could be carried out. The success of his experiments, however, prompted another investigator to enter the field. This was Dr. Cranz, of the Berlin Military Academy. The apparatus this professor evolved has been devoted exclusively to the study of the flight of projectiles and to photographing the