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46 AMATEUR MOVIE MAKING
tomed to his individual meter. He would find by trial and error that appearance which gave him the best results and this he called the point of extinction.
This condition, in turn, led to the invention of the Drem Exposure Meters, of which the Cinophot is the universal motion picture meter. These meters are independent of all personal idiosyncrasy, and time after time the writer has seen tests made wherein several persons, many times those unfamiliar with the instrument, secure readings within one point of all the rest. Also under rigid tests in New York studios it has been proven to be absolutely accurate.
The meter itself is a short tube with an eyecup which to some extent resembles a pocket telescope. In use these steps are followed :
1. Loosen the set screw.
2. Pull out inner nickel tube at diaphragm collar, ex posing a window in the nickel tube, just above the knurled iris ring. In this window appears the selective exposure time 1/25, 1/5, 4 or 30."
3. Turn the diaphragm ring to the left, counter-clockwise, in the direction of the arrow on the nickel tube. Each turn of one-quarter circle snaps one of the four basic observation figures, namely, 1/25, 1/5, 4 or 30, behind the time window, and places the same figure automatically in line of vision within the instrument. Assume that 1/5 is thus placed.
4. Turn diaphragm collar back to the right, clock-wise, about one-quarter circle, until meeting with a checking resistance. This opens the diaphragm fully. Do not force beyond that.
5. Remove eye glasses, if any. Place eye cup to the eye, excluding extraneous light. Close or shield the other eye. Point the instrument towards a bright light. The number which you placed at the time-window of the nickel tube will now be discerned, although more or less blurred, as a translucent figure within the instrument.
6. Telescope the nickel tube in or out, in a longitudinal sense, without removing the instrument from the eye, until the figure (in our example: 1/5) is sharply focnssed.