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

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«• 5000 SEC • ACTUAL SIZE .OIO"APERTURE I NORMAL 3 WIDTH 1 NORMAL 2 WIDTH STANDARD APERTURE Fig. 2. Appearance of small sphere traveling at 100,000 diameters/sec with various apertures — several consecutive frames superimposed. subject so often necessary to this work, an overall sequence controller, developed by the Remington Arms Co. for its own use, was adapted with minor modifications. This device controls the operation of the lights, the camera, and single or multiple operation of the event wherever this can be accomplished electrically. In order to take advantage of the improvements recently incorporated into the Fastax camera, namely the highresolution prism and the bright-field viewfinder a new 16mm Fastax was purchased. The prism of the original Fastax has been removed in order to provide a high-speed streak and oscillographic camera, which, with the aforementioned aperture boxes, is capable of a time resolution of 2 to 4 jusec. In the study of impacts, for example, it can provide more complete information than any standard frame-type camera since a normal camera sees the object being viewed for but a fraction of the total time, while a streak camera views the object continuously during the taking cycle. Figure 3 is the streak image of a punch as it is struck by a dropping hammer. An Edgerton high-speed stroboscope was purchased to provide microsecond time resolution without the intense heat produced by the incandescent sources normally used. Many of the operations about which we are most concerned are strongly affected by ambient temperature. The presence of a hot body in close proximity to the operation is often required to provide sufficient light and in several instances has caused a complete breakdown of the process being investigated. This has been particularly evident in research on the mechanism of spinning of synthetic fibers. In connection with this same research, lens equipment was needed which would provide greater flexibility than those normally supplied with the Fastax camera. We had already obtained the standard complement of lenses including the 25-, 35-, 50 and 104-mm lenses and had built lens extension barrels to permit focusing these lenses at shorter distances than those for which they were normally rated. Due to the unique Johnson: Photography in Chemical Industry 621