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.
1014 HANDBOOK OF PROJECTION FOR
light blue in color. This material is extremely sensitive to the action of light.
The ring-shaped conductor connects, through the positive wire, to the grid of the first amplifier tube. Thelight-sensitive material deposited on the silver coating connects through it and the negative wire to the filament of the first amplifier tube.
The circuit thus formed is connected to a 100-volt storage battery, so that its voltage is impressed upon the two elements of the photo-electric cell.
However, as matters now stand, since the anode (ringshaped conductor) and the cathode (light-sensitive material) are separated by considerable distance, there would be no current flow. There must be an added element, and this is supplied by the gas with which the cell is filled. It is a rare gas which when the interior of the cell is in darkness is a very poor conductor of electricity. It is in fact an insulator for any but a very high voltage. It therefore follows that when the cell is dark, no current flows.
When this cell is in place in the slit assembly, however, with proper connections made, and the projector is started so that light from the slit which has passed through the film sound band enters the cell through the opening before mentioned, the light-sensitive material has forced out of it, or throws off minute particles of negatively charged electricity called "electrons," and these particles "ionize" the gas, causing it to become an electrical conductor in exact proportion to the amount of ionization.
Please read that last sentence over again and get the idea fixed in your mind. Remember also that we are