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Updated: May 31, 2025
That society proposed the adoption of the decimal division, by taking for a fundamental unit the ten-millionth part of the quarter of the terrestrial meridian. The motives which determined this choice were the extreme simplicity of decimal calculation, and the advantage of having a measure taken from nature.
A photograph of a Cygni, taken November, 26, 1886, shows that the H line is double, its two components having a difference in wave length of about one ten-millionth of a millimeter. A photograph of o Ceti shows that the lines G and h are bright, as are also four of the ultra-violet lines characteristic of spectra of the first type.
Thus, the surface of water conforms to the surface of a sphere eight thousand miles in diameter; but, as the arc of such a circle would arch up from a chord ten feet long by only the ten-millionth part of an inch, the surface of water in a cistern may be considered a plane.
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