The energy that a fly uses in crawling up one inch of window-pane in one second, is as near to nothing at all as most people can imagine. But last week, Dr. D. D. Knowles, 28-year old research engineer of the Westinghouse Electric & Manufacturing Co., demonstrated before unbelieving eyes in the Hotel Pennsylvania in Manhattan, a device that runs on one-fortieth of one fly-power—in electrical parlance: one-billionth of a watt.
By Dr. Knowles' device, a dewdrop could be made to stop a battleship, a passing cloud...
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