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.
ISO SOUND MOTION PICTURES
over a tension idler over a drum (this keeps the film moving evenly past the slit ray, which is carried to the photoelectric cell), over another spring idler to the lower take-up sprocket, and to the lower take-up reel in the lower magazine.
The projector is very easily threaded. The R. C. A. take-up, which is installed on the R. C. A. Projector, is chain drive and includes two plates, one installed directly over the top of the other. As the film is being taken up on the reel in the lower magazine, the weight increases. The friction against the lower plate, which is driven from the mechanism, causes the take-up to function with a very steady, even pull, which is very easy on the film. In addition to the R. C. A.-Photophone Projector, R. C. A.Photophone manufactures a special sound head attachment that can be installed on certain standard motion picture projectors.
Two amplifiers are furnished with R. C. A. equipment. One is always kept in reserve in case of emergency. The two voltage amplification stages have one UX-841 tube and two UX-210 tubes. There are connected ten UX-845 tubes in two banks of five push-pull switches in the power amplification stages. Jacks are connected with the amplifier circuits to check the condition of the latter; plugs with cord to plug into the jacks are provided, and two meters are supplied for checking. The left side of the amplifier is confined to the operation of projector A and the projector B is confined to the right side. Three meters, marked "IP Back Tubes/' "IP Front Tubes," and "Speaker Current," and one "Charge-Discharge" meter are permanently connected in certain amplifier circuits.
A monitor loudspeaker, which is used as a check upon the output of each amplifier, may be attached to a "Monitor" plug on either amplifier. An important feature of the R. C. A. equipment is that, by the use of special circuits