Spark Photography and Its Application to Some Problems in Ballistics (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from Spark Photography and Its Application to Some Problems in Ballistics

Spark photography in which the illumination is provided by an electric spark of such short duration that a moving object appears stationary has many applications in the investigation of high-speed phenomena. The record obtained is not an image, no lens being used, but is simply the silhouette of objects between the light source and the photographic plate. Reference to previous work along similar lines will be made later in this paper.

Two distinct problems are presented in the photography of moving objects. One of these is the timing of the spark so that the desired epoch of the phenomenon under investigation may be photographed, and the other has to do with the duration of the spark. All of the photographs described in this paper were taken on plates not larger than 8 by 10 inches. A projectile moving at a speed of it./sec. Would be in front of such a plate, and, therefore, in a position to be photographed for only second. If the projectile is to be photo graphed within an inch of a predetermined position, the time of occurrence of the spark must be correlated with the position of the projectile to within second.

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