This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1809 Excerpt: ...is 74' in the horizon, it would only be f 56', if the density of the atmospherical strata diminished in arithmetical progression, and became nothing at its surface. The horizontal refraction which is observed to be about 64'f, is a mean between these limits. The law of the diminution of the density of the strata is ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1809 Excerpt: ...is 74' in the horizon, it would only be f 56', if the density of the atmospherical strata diminished in arithmetical progression, and became nothing at its surface. The horizontal refraction which is observed to be about 64'f, is a mean between these limits. The law of the diminution of the density of the strata is then nearly the medium between the arithmetical and geometrical, progressions, which agrees with the observations of the barometer and thermometer. In general all these observations and those of astronomical refraction maybe reconciled by means of very probable hypotheses of the diminution of heat from ascending in the atmosphere without having recourse, as some natural philosophers have done, to a particular fluid which, mingled with the air, produces refraction. When the apparent altitude of a star exceeds f 12, the refraction only depends sensibly on the state of the barometer and thermometer in the place of the observer; and it is nearly proportional to the tangent of the apparent distance of the star from the zenith diminished by four times the refraction. It has been discovered by different 34' 49' 8. +10 48'. means that at the temperature of melting ice, when the height of the barometer is 76 centimetres, the co-efficient, which multiplied by this tangent gives the astronomical refraction is 185."9, but it varies as the density of the air in the place of observation: this density varies a 250th part for every degree of the thermometer; this co-efficient must therefore be increased or diminished as many times its 250th part, as the thermometer of the observer indicates degrees above or below zero; the density of the air at unequal temperatures being proportional to the height of the barometer, the co-efficient thus corrected must be va...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
