Abstract

CORRECTIONS TO REFRACTION TABLES.—Prof. Cleveland Abbe, in a short note to the Astronomische Nachrichten, calls attention to the fact that the reading of the mercurial barometer which is used in the refraction-formula as an index to the density of the air is not a true index to the pressure controlling that density until it is corrected for the effect of the variations in gravity. The correction is accomplished by adding one more factor, g; for gravity, when the formula becomes—

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