Word: shadowgraph
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Dates: during 1940-1949
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...masses of varying density. Barnes and Bellinger caught these rapid changes in air density by means of an extremely fast mercury lamp with an exposure of less than one-millionth of a second. The light, flashed through a region of disturbed air, recorded on a photographic plate a "shadowgraph" showing groups of bunched air molecules. Using a more elaborate rig, which has a knife-edge that stops all but the bent light rays, the experimenters developed a technique so sensitive that it can photograph the heat rising from a human hand at room temperature...
...method of revealing the true identity of an artist's work, X-ray shadow-graphs have proved, the Fogg exhibition reveals, that four paintings previously accredited to the artist Gorgione are not his. By imagining how to hold a brush, following the strokes in the shadowgraph print, a student can reproduce the size, shape, speed and direction of the artist's brush-stroke, an excellent means of study...
...European War affected the Museum's program of obtaining X-ray shadowgraph of paintings. An exchange of shadowgraph material arranged with the National Gallery, London, and with the Louvre, Paris, was interrupted and during the past year only nine such prints were received from London, and none from Paris. The Fogg Museum collection of X-rays of paintings now numbers 4,099, Mr. Forbes reported...