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Authors

W. H. Clark

Document Type

Research

Abstract

The degree of accuracy with which physicists have divided the fundamental units of length and mass, the centimeter and the gram, demands a division equally as accurate of the remaining unit, the unit of time. We are all familiar with Michelson's measurement of the standard meter where a half and a quarter wave length of light was a quantity not to be neglected. Our recent literature describes a balance which will weigh to one millionth of a milligram. When we consider these facts and the added fact that time so often enters into our formulae to the second degree we see the necessity of accurate small divisions of our unit of time.

Publication Date

1911

Journal Title

Proceedings of the Iowa Academy of Science

Volume

18

Issue

1

First Page

105

Last Page

111

Copyright

© Copyright 1911 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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