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.
704A HANDBOOK OF PROJECTION FOR
purpose is to provide a means of balancing the resistance of the instrument circuit to compensate for the additional resistance of the run of wire from the projection room to the indicators located at the distant point.
INSTRUCTIONS FOR INSTALLATION.— The instruments should be connected as per diagram blue print furnished with the outfit.
The instruments have been calibrated at the factory with the adjustable arm of the resistance unit in a certain position, this position of the arm being indicated by a notch in the edge of the porcelain base and a scratch on the resistance arm. This resistance unit should be mounted on the front wall of the projection room.
.No. 14 B&S insulated copper wire should be used to connect the various indicators.
After the installation is completed, the reading of the indicators should be checked with one of the projectors running at a known constant speed. The speed of the projector can be found by counting the revolutions of the crank shaft during one minute. If the speed of the indicating instruments does not correspond with the speed of the projector it will be due to the resistance of the wiring betwreen the projection room and the indicators in the orchestra pit and manager's office. In this case the resistance arm should be moved until the indicators show the correct speed. This adjustment once made, it will not be necessary to touch the resistance unit again.
All indicating instruments furnished for any particular installation are interchangeable with each other, so that any instruments can be used for the projection room, orchestra pit, etc.
The snap switch included with the outfit should be mounted on the front wall of the projection room between two of the projectors. When Power's Instrument Panel is furnished, this switch will be mounted on one of the panels. By means of this switch the generator on either projector is connected to the instrument circuit. After each change-over, the switch knob is turned until the number of the dial on the switch corresponds to the projector projecting the picture.
CAUTION.— Do not tamper with the instruments or generators. If any trouble is not due to loose connections or faulty wiring, communicate with the manufacturers, stating the number of indicators and magneto-generators in the installation.