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234 CINEMATOGRAPHIC ANNUAL
A much shorter and equally accurate way of determining the correct exposure as through a hand-test has been given us in the scientific exposure meter, of which there is quite a number of excellent types on the market. They work independently of time, temperature, and location. Although their methods of arriving at the required results vary considerably, they all depend for accuracy on the practice, good manipulation, and judgment of the individual operator. The practical outcome of the exposure will be as closely correct as those data obtained in engineering by means of a sliderule.
There are several photometers of merit on the market to suit the needs and requirements of every cameraman or photographer.
B &i H Photometer
The B&H photometers, manufactured by the Bell & Howell Co. of Chicago, employ the simple principle of comparing a lighted filament of definite adjustment with the object to be photographed. The whole picture is clearly visible at all times. The three different types for use with professional motion picture cameras, Filmos, and still cameras vary only in the markings of the scales, which are most readily adapted to the purpose intended.
Based on an entirely different principle are the exposure meters which the Drem Products Corporation of New York puts out. Their nature is of the extinction type, i. e., the light reflected from the object is used to illuminate a figure on the ground-glass inside the meter. This figure may be gradually dimmed by closing an iris built into the instrument. When it disappears the correct exposure may be read. Only the Dremo, the photometer designed mainly for amateur use, gives a direct view of the object; the other types are simply aimed at the subject to be measured for light intensity.
Another useful precision exposure meter with direct view is the Bewi, distributed by the Burleigh Brooks Co. of New York. It shows the scene in monotone, surrounded by a scale of numbers which decline in density from 1 to 17. The highest number visible