Word: lightnesses
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Dates: during 1920-1929
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That exception is the fact that Professor Albert Abraham Michelson of the University of Chicago has very accurately calculated the speed of light. It travels 186,000 miles a second. That figure, Professor Michelson said at Washington last week, was not more than one mile from exactness. And now scientists knowing that, he proudly repeated, can at any time they please remake the Paris standard metre...
Professor Michelson's presence at Washington last week was a joy to him. The Optical Society of America was meeting there, in the auditorium of the Bureau of Standards. Several hundred physicists who have been searching out light's properties and effects hailed him as one of their greatest. He had measured light data upon which Albert Einstein was able to base his relativity theory...
...presentation done, Dr. Ives explained to the physicists present a new camera invented by Dr. Clarence Whitney Kanolt of the U. S. Bureau of Mines. It makes pictures seem lifelike. In front of the photographic plate is a glass grating of alternate vertical light and dark lines. In photographing, the camera so moves before the subject that its centre is always on a line with the centre of the camera lens and plate. The finished picture is striped. Some of the stripes show the person or thing from one angle, others from other angles. When a second glass grating...
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...
Obliquely interesting to the light physicists at Washington was the California Institute of Technology's decision to build a 200-inch telescope near Mount Wilson. The present Mount Wilson apparatus has a 100-inch reflecting mirror. The new one, to be done in three years, will double the astronomer's vision, quadruple the amount of light that at present can be caught from the stars. The great mirror, about 17 feet in diameter, is possible because Professor Elihu Thomson of the General Electric Co. has learned how to fuse quartz into great discs that will not crack...