VII. A new determination of the ratio standard yard to the international prototype metre

Abstract

Abstract The method employed for the determination of the ratio involves the use of a subsidiary line standard which is specially graduated in main intervals of 1 1/8 inches. The graduations define a number of approximate yard and metre lengths, 32 main intervals being closely equivalent to one yard and 35 to one metre. The relative values of the yard and metre lengths can be determined by a calibration of the main intervals, while their absolute values are determinable by comparison with the corresponding primary standards or attested copies. The Paper describes how these determinations have been carried out and applied. They result in the following value of the ratio:- 1 metre = 39.370147 inches.

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