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On the Making of Recording Instruments and a Moving Model of the Solar System

On the Making of Recording Instruments and a Moving Model of the Solar System

HENRY MARROWS, AN INSTRUMENT DESIGNER of New York City, quarrels with the cliche that the primary tools for scientific research ultimately boil down to just a pencil and a piece of paper. "A brain limited to this method of recording data," he writes, "would certainly arrive at a narrow concept of the universe!" Over most of the spectrum of natural phenomena it is impossible to record observations without the assistance of more rapid, more sensitive, more tireless or more accurate recording instruments. Marrows explains: "A pencil propelled by human muscle can keep up with only about five events per second, and a human being cannot stay awake long enough to make a continuous record of events lasting more than about 24 hours. In the parlance of instrument designers, the muscle-driven pencil has a sharply limited frequency response. The frequencies of nature stretch across a spectrum paced at one extreme to the slow evolution of galaxies, covering billions of years, and at the other extreme to the spin of an electron, taking place within a millionth of a microsecond.

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On the Making of Recording Instruments and a Moving Model of the Solar System
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