Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Botoii*9 mirror Condenser \Priyinf Fig. 31. Optical setup for cinematography at 50,000 frames/sec. Fig. 32. Failure of notched bar, recorded at the rate of 30,000 frames/sec. switch is reset by the delayed pulse. The delay circuit is of the type described above. Conclusion The methods described in this paper are essentially the modern electronic counterparts of very old electrical methods of high-speed photography and cinematography. The introduction of electronic control devices has made the instruments more accurate, more reliable, more flexible, and therefore easier to handle. No special skill is now required to photograph a projectile at a point of its trajectory denned to an accuracy of 1 mm or less or to analyze its motion at a rate of 1,000,000 frames/sec. It would be a fruitless task to attempt to evaluate these methods against mechanical methods of high-speed motion picture photography. Electrical and mechanical methods should rather be considered as complementary. In some cases, the best solution lies in a combination of each. The methods described above are particularly well suited to the investigation of fast transient phenomena of the nonluminous type, such as are often encountered in ballistics. The choice of a method suitable for a particular application is often difficult; except w 625