Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 262
measurement of length or motion a most refined in-strument is the interferometer, devised by Professor A. A. Michel-son, of the University of Chicago. It enablesMeasurements an observer to detect a movement through oneInterferometer. five-millionth of an inch. The principle involved is illustrated… … Photograph by Cc PROFESSOR A. A. MICHELSON,University of Chicago. THE INTERFEROMETER 215 by dropping- a pebble at each of two centres, say a yard apart, ina still pond, we send out two systems of waves, each system willripple out in a series of concentric circles. If, when the wavesmeet, the crests…
Inventions · Inventors
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