We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
STROBOSCOPIC-LIGHT HIGH-SPEED MOTION PICTURES* H. E. EDGERTON AND K. J. GERMESHAUSEN** Summary. — A discussion of various methods of producing motion pictures at speeds higher than at present attainable with intermittent mechanisms; followed by a description of a high-speed motion picture camera (1200 frames a second, on 35-mm. film) using intermittent light from mercury-arc stroboscope lamps developed at the Massachusetts Institute of Technology. Several examples of the use of the lamp are given. The development of the motion-picture camera provided an ex- cellent means for recording the motions of objects and for reproducing them whenever desired. Furthermore, it provided a means of chang- ing the time-scale so that actions too slow to be seen in life (like the growth of a flower) or too fast (like the splash of a drop of liquid) might be projected upon the screen at such a rate that the eye would be able to see and the mind to comprehend. The usual type of intermittent-motion camera, when carefully designed and con- structed, is able to take pictures at rates up to about 200 per second. Motion pictures taken at 200 frames per second and projected at 16 per second portray on the screen the motion of the subject slowed down by a factor of about 12.5 times. The value of high-speed photography in its varied forms has long been recognized. From 1878, when Muybridge 1 first used a number of cameras tripped in succession to study the action of running horses, to the present day there has been a steady effort to develop photo- graphic technic to enable one to see and record events too quick for the eye. For many subjects the number of pictures per second attained by intermittent mechanisms is sufficient. Slow-motion pictures taken at such speeds have proved valuable for making time-motion studies of people doing production work, recording the winners of races, studying the movements of athletes, and for measuring the actions of * Presented at the Spring, 1934, Meeting at Atlantic City, N. J. ** Massachusetts Institute of Technology, Cambridge, Mass. 284