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THE HANDBOOK 0 F M OTION
which will point to some "f" number. Say this i 11. We now set the computing index, l/25th <>!>]>< >site 11 and on the same scale, opposite a small arrow we read the proper iris aperture for
normal Speed motion photography. ( Hher >hutter speeds are also given so that the meter may be
used with any shutter aperture or in time condensation work. Jt is a complete and reliable Scientific instrument and, while slightly higher in
price than other types, it will be found to be a valuable investment.
When we have determined the proper aperture for use under the existing conditions, we set the camera lens to this aperture. The camera is now ready for use.
If the camera is of the automatic drive type, all that is necessary is to support it in the hands or upon a tripod in such a manner that it will remain steady and press the release button.
Tf the camera is of the hand cranked type, a tripod is quite necessary. This tripod should have a to]) or head which will permit the camera to be swung through a horizontal arc (pam movement) and through a vertical arc (tilt movement). This will allow the camera to be swung so as to include any angle of view.
Before using the hand cranked camera, it will be necessary to master the art of cranking. The standard motion camera passes six inches or eight frames of film at each crank revolution. This means that the crank must be turned two times per second as normal cine Speed is one foot or sixteen frame per second. In cranking, a steady, uniform motion must be maintained. If this is not done the him will be unevenly exposed and the subject will jump upon the screen. CrankUS