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.
Electrofax RCAs Low-Cost Photosensitive Papei r and New Dry Photo Process A -l\. low-cost, coated paper that is so photosensitive that it can make contact prints at exposures of a fraction of a second has been developed by scientists of the Radio Corporation of America for use in a new, simplified dry photographic process known as Electrofax. Although the Electrofax paper is as sensitive as standard photographic contact printing papers, it com- pares in cost with the low-sensitivity diazo papers in common use for reproduction of diagrams and plans. Created for use in the Electrofax process for obtaining rapid and permanent prints from photo negatives, micro- film enlargements or projected images, the new paper has proven its sensitivity in numerous tests, including experimental use in a camera. At exposures of one-half a second in outdoor light, it has produced positive prints in a few seconds, with no chemical processing. The speed with which images can be photographed and printed with the new paper and the Electrofax technique has permitted experimental development of a mechanized system of continuous-strip reproduction that may be adapted to use with electronic computers or other devices which produce a flow of visual informa- tion. The Electrofax process, developed by C. J. Young and H. G. Greig with a team of RCA scientists at the David Sarnoff Research Center of RCA, in Princeton, N. J., also is regarded as a practical and inexpensive method of producing master copies of letters, diagrams, microfilm records and other documents. Sensitivity Achieved by Special Coating The sensitivity of the new paper has been achieved by applying a thin layer of special zinc oxide in a resin binder. Both materials are inexpensive and readily avail- able. The coating may be applied to a wide range of papers, from those of low-cost wood pulp base to high strength bond, according to the requirements. When the paper has been coated, it remains insensitive to light, and hence may be handled without fear of inadvertent exposure, until the coating is given a negative electro- static charge. The charge is applied in the dark by transfer of ions as a charged wire is moved across the coated surface. Once the charge has been placed on the layer, the paper is sensitized and must be shielded from light in the manner of ordinary photographic film. The uncharged coated paper, however, will keep indefi- nitely without deterioration. Magnetic "brush" applies pigmented resin powder to bring out image on sheet of photosensitive paper de- veloped by RCA scientists for use in Electrofax process. Below, C. J. Young (left) and H. G. Greig, co-developers of Electrofax, inspect results. 20 RADIO AGE