Word: infra
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...were not successful, mostly because of hastily assembled equipment. After many months of work, an improved transmitter pointed at Lincoln Laboratory from Mount Wachusett. The tiny gallium arsenide diode, only 0.01 in. in diameter, was placed precisely at the focus of a 5-in. reflecting telescope that concentrated its infra-red light into a tight bundle. On the roof of the lab, the researchers set up their receiver-the reflector of a 5-ft. war-surplus searchlight with a sensitive photocell at its focal point...
...observers were stealing no secrets; they were checking on their own work. The bright gleam of infra-red light that they had seen through the snooperscope bore out their suspicion that they had stumbled on a new and revolutionary kind of communication device...
...breakthrough had come as Physicist Robert J. Keyes checked on the properties of a gallium arsenide diode developed by Lincoln Lab Engineer Theodore M. Quist. A less-than-gnat-sized electronic device that generates pure infra-red light when a small direct current is passed through it, the diode turned out to have an extraordinary property: the intensity of the normally invisible infra-red beam could be easily controlled by varying the strength of the current that generates it. Keyes speculated that if his little light beam was visible at any distance, it could be modulated to carry the human...
...smaller office copiers for sale. Evanston's American Photocopy Equipment Co. and Eastman Kodak Co. with its Verifax dominated the "wet copying'' field, which uses chemical developers; Minnesota Mining & Manufacturing Co. had its fast-selling Thermo-Fax, a dry method that uses heat from an infra-red lamp to form an image on specially coated papers. But the Xerox machine had a special appeal. It is a dry method that needs no chemicals, can duplicate anything from grease pencil to ballpoint pen, though it is more successful in copying type than photographs. The 914 makes copies...
...spectroscopic studies should yield new information on the atmosphere and climate of the red planet. Mars has no light of its own. The light that it sends to the earth is sunlight that passes down through the thin Martian atmosphere and is reflected out again. Loss of certain infra-red wave lengths during these two passages will prove the presence of water vapor, carbon dioxide and other interesting, life-supporting constituents...