The French Metre.
Tha French metre is oxptoasci in terms of the length of a quadi'&ni, of t,b.3 earth's suri'aoe, uul; Arab's, thy illustrious philo^o !j or, iy-^yi; it ed thafc it had not Lcoa ck:U.i mined in terms of tho y/avb length oi light. This has now been <!oim by Mr JVHchelson at thu Jutornatioiail Bureau of Weights and MecUiuvas, Seires. By a ■ method h-xw\\ on " interference fringes," ha has measured the wave lenglhs of different lights aud compared them with tho length of ihc standard metre. Operating in particular with the red ray of incandescent cavmium, he finds the standard metre to be correct to a demi-micion, that ig to say one five millioneth, which is about the nearest opproximation to absolute accuracy that can be attained.
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https://paperspast.natlib.govt.nz/newspapers/MH18940217.2.16
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Manawatu Herald, 17 February 1894, Page 3
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129The French Metre. Manawatu Herald, 17 February 1894, Page 3
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