We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
10 A. L. HOLCOMB Vol 42, No. 1 necessary that the shutters of cameras and the background projector be in phase as well as in synchronism. Also, the necessity for taking sound-recording equipment on location has introduced weight and bulk factors which demand a light and efficient system for this duty. Several different motor systems have been developed or adapted to meet these particular needs, and various motor system speeds have been adopted by different studios to meet their specific conditions or desires, but it should be borne in mind that in all normal speed shoot- ing the object is to move film past the translational point at 90 ft per minute, which in the case of cameras is 24 frames per second. This film speed requirement must always be met regardless of the motor speed used, and in most cases this is accomplished by interposing gears of the proper ratio between the motor shaft and the film-pulling sprocket. Practically all cameras are provided with a drive shaft that is designed to rotate normally at 1440 rpm, which is shutter shaft speed, and all camera motors which run at speeds other than 1440 rpm have the required gears built into the motor housing or adapter. In fact even the camera motors that run at this speed usually have 1 : 1 gears so arranged that the motor shaft may lie parallel to the shutter shaft for better compactness. Recorders and reproducers are usually equipped with built-in gears since the film-pulling sprock- ets are frequently different from those used in cameras in order to obtain uniformity of film travel, and in most cases the drive shaft is direct coupled to the motor. The older Mitchell camera, which was equipped with ball bearings and is called the Standard Mitchell, requires from 25 to 40 watts shaft power to drive it at normal speed when the temperature is around 70 °F. With lower temperatures, the power is somewhat in- creased but not seriously. The Mitchell NC camera, which is widely used at present, requires an average of 50 watts at 70 °F, but since this unit is equipped with oilless bearings, the bearing friction rises sharply with lower temperature and while no exact data are available, observation would indicate that the load at 32 °F is approximately 150 watts. Cameras have been successfully operated at much lower temperatures and the load appears to increase at about the rate in- dicated between 70° and 32°. Technicolor cameras demand normally about 100 watts and their power demand increases to approximately 350 watts at 25 °F. Exact values can not be stated because bearing clearances differ in individual cameras of the same type. Sound recorders vary so widely in type that no attempt will be made to