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Chart Finish !
j Stull, A.S.C.
Chart are recording the finish of every race at Hollywood Park, and by the time it is printed, they will be settling arguments at Del Mar for the third successive season.
Cine-technicians have often remarked that the pictures made by the Photo-Chart camera show a striking resemblance to the screen effect of "follow-shots” made with an Akeley camera. Actually, the basic principles which give such similar effects are closely similar, even though in detailed operation the two equipments have nothing in common. So recalling why the Akeley gives its characteristic results may help us to understand how Del Riccio, with a lens, an aperture and a moving film, but with no shutter, has created the most scientifically accurate system of racetiming yet known.
When a newsreel cameraman trains the telephoto lens of his Akeley to
follow a fast-galloping race-horse, on the screen we see (if he is a good lensman) a picture in which the horse gallops as though on a treadmill, while the background flows byin a smooth blur. The reason for this is that between the smooth-panning gyro movement of the Akeley, its accurate, matched-lens finder system, and the skill of the cameraman, the image of the horse remains stationary with regard to the frame, while due to the rapid panning of the camera, the image of the background moves so fast across the film that the shutter cannot “stop” it; hence the blur.
Much the same thing, but with reverse English, takes place in Del Riccio’s Photo-Chart camera. To put it briefly, the film moves across a narrow aperture at the same speed, and in the same direction as the image of the galloping horse moves. Therefore the image of the horse is stationary relative to the film, and is recorded as a sharp picture, while the image of the background is a blur, as might be expected in a picture of a motionless object made on continuously-moving film.
The aperture is the heart of the Photo-Chart camera. Though it is
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