Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 15
length to the original platinum oneof 1799, but of course minute diflferences existed betweenthem—perhaps one part in one hundred million. So the onewhich appeared to agree most perfectly with the old standardwas taken as the new International Prototype Standard.The new kilogram (see § 11) was also… … NATIONAL STANDARDS 5 secured by tlirce locks, the keys of which are kept by threedifferent high officials. The vault is opened not oftener thanonce a year, at which time all three officials must be present. 6. National Standards. The metre rod kept in the vaultat Sevres is the standard for the…
Physics
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