Word: prisms
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Dates: during 1920-1929
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...that of double refraction. Straining the medium between the polarizers, which in our case is a celluloid model of the machine we are working on, increases the transmission through the second polarizer and a color scale is produced similar to that produced by the passage of light through a prism. By photographing the display of colors and their form, we can determine the amount of stress applied to the model and the limit of stress which can be applied...
...means of a prism placed over the object glass of the telescope, photographs of stellar spectra have been taken at Harvard for the last forty years. The light of any star of sufficient brightness in the field of view is spread out into a band, showing characteristics by which the spectra can be classified into various groups...
Another interesting machine described at the meeting was the recording spectrophotometer devised by Professor Arthur Cobb Hardy of Massachusetts Institute of Technology and General Electric's research staff. In the machine is a glass prism which breaks up the light reflected from any colored object into its spectroscopic lines. A chart of those lines is photographed and the picture may be sent by wire or wireless anywhere. Useful can this device be for recording the exact tints of textiles, oils, soap, cheese, lard, flour, butter, chocolate, glass, automobiles, tile, brick, roofing material, carpets, rope, hardware, paper, leather, cement, linoleum...
...inconvenience when a person looks at distant objects. When he looks at close objects for long periods he forces his eyes to twist towards each other and so strains their muscles. Then he has myopia; then he is nearsighted. To prevent the affliction, Dr. Wiseman recommended the use of prism glasses...
...noted Roentgen ray expert, is at present attempting to determine the structure of the atom by means of X-ray spectra. A current of tremendous voliage is projected into a Roentgen tube arranged in such a way that the X-ray generated will be passed through a diamond prism. The resulting spectrum is caught on a photographic plate...