An Electric Micrometer 1


    THERE is no finality in experimental measurement. In physics it is a common experience for a present-day worker, with better appliances and a wider horizon than his forerunners, to surpass all previous experimental work in accuracy. As knowledge increases it becomes more minutely exact, and nowadays the physicist has often to measure lengths much less than anything visible in any microscope.

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    An Electric Micrometer 1 . Nature 72, 495–496 (1905) doi:10.1038/072495a0

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