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From the developer tank, the negative loops through a potent short-stop bath, and into a long, horizontal hypo-tank.
The bottom of this hypo-tank is glass. The top is open, and mounted under a lamp-house holding three No. 2 Photoflood globes, while a pair of rollers hold the film flatly in place. Beneath the glass-bottomed tank is the pre-focused lens of an enlarger, which projects the image downward to an easel holding a strip of enlarging paper about a foot long, fed from a roll in a light-proof magazine below the easel.
This strip gets a mechanically metered exposure, and is handed to an assistant who puts it through the quickest sort of tray development, stop-bath and fixing. A brief rinse, and the completed print is slipped between blotters and handed out to the judges — in an average time of 48 seconds from the instant the first horse crossed the line!
If the finish is a supremely close one, another pre-focused lens and a larger easel are slid into place, and an 8x10 print of the leading finishers can be made, to give the judges a chance for really precise measurements of those “won-by-a-nose” finishes.
Fully as ingenious as the camera itself are the auxiliaries developed by Del Riccio to simplify the problems of operation. To a remarkable extent, they eliminate the several variables which enter into the making of each picture.
The first problem in making any picture is of course exposure. In the Photo-Chart camera, the exposure must
be controlled by the lens aperture. To simplify this, a built-in exposure meter is provided. A suitably matched lens images the field on the electric eye of a common, commercially available photoelectric exposure meter.
The next question is how to match the movement of the film with the speed of the horses, which naturally varies somewhat from race to race. This is solved very simply. As the horses swing into the straightaway, the operator trips a timer, built into the Photo-Chart camera-housing, but essentially like the dark-room timing clocks that can be bought for a few dollars in any photo-supply store. As the lead horse reaches another marked point, this timer is switched off. In addition to the usual calibration of seconds on the timer's dial, this one is also calibrated in miles per hour. So on a fast day, if the timing-clock's needle points to 40, the operators know the bangtails are finishing at a 40 m.p.h clip, and need simply reach to an adjacent dial to place the filmmoving control at 40, which will move the film past the slit at a speed precisely corresponding to that of the image of a horse moving at 40 miles per hour.
The final problem is that of timing the printing operation accurately. Since the camera exposure and neg
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