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AMATEUR MOVIE MAKING 43
the Watkins Meter, first popularized in the "Bee" type. This instrument does not look unlike a watch. Beneath the crystal is a movable scale in which is a small round opening. One-half of this opening is covered with a graytinted shield, the other half is open. Beneath this scale is placed a disc of sensitive paper which can be exposed portion by portion by slightly turning the bottom of the case. In use this meter is placed in the position occupied by the subject or in a position which is correspondingly lighted. A fresh portion of the paper is brought under the opening where it will begin to turn dark. Seconds are counted
Filmo actinometer for indicating: proper exposure.
until the paper has the same general depth of tone shown in the permanent gray shield tint. This is known as the actinometer reading. Upon the left side of the rim of the case we see a series of numbers with the word "ACT." This means actinometer, and this series of numbers correspond to the number of seconds required to darken the sensitive paper. Upon the left side of the dial, adjacent to the actinometer scale, we see a column headed "Film." The numbers in this column refer to the speed of the film used and are an expression of a system of film speed testing known as the Hurter and Driffield method. The figures are commonly known as the H&D values. A small dot is placed opposite 250 indicating that the ordinary cine film has a speed of 250 H&D.
Suppose that it took 150 seconds to darken the sensitive paper. We set the 250 film reading midway between 130