Tables, Meteorological and Physical: Prepared for the Smithsonian Institution

Front Cover
Smithsonian Institution, 1858 - Meteorology - 636 pages
0 Reviews
 

What people are saying - Write a review

We haven't found any reviews in the usual places.

Other editions - View all

Common terms and phrases

Popular passages

Page 34 - Corrections to bo applied to the Means of the Hours of Observation to obtain the true Mean Temperatures of the respective Days, Months, and of the Year.
Page 1 - The laws of the distribution and transmission of moisture through the atmosphere are too little known, and its amount, especially in mountain regions, is too variable, and depends too much upon local winds and local condensation, to allow a reasonable hope of obtaining the mean humidity of the layer of air between the two stations by means of hygrometrical observations taken at each of them. These...
Page 21 - T', or the Difference of the Temperatures of the Barometers at the two Stations. This Correction is Negative when the Temperature at the Upper Station is lowest, and vice vers i. T—V. Correction. T— T'. Correction. T — T1. ( Correction. T— T'.
Page 4-7 - REDUCING TO THE FREEZING POINT THE OBSERVATIONS TAKEN WITH OLD FRENCH BAROMETERS, PROVIDED WITH BRASS SCALES, EXTENDING FROM THE CISTERN TO THE TOP OF THE MERCURIAL COLUMN ; CALCULATED FROM 240 TO 345 LINES, OR FROM 23 INCHES 4 LINES TO 28 INCHES 9 LINES.
Page 18 - We then calculate the correction a.— '- — -- — for the temperature of the air, by multiplying the nine hundredth part of a by the sum of the temperatures t and t', diminished by 64.
Page 2 - GLASS SCALES, TO THE FREEZING POINT. IN most of the common barometers the scale is engraved upon a short plate of brass, or of ivory, fixed upon the wooden frame of the instrument. In such a case, the compound expansion of the two substances can only be guessed at, and the correction to be applied to the observations for reducing them to the freezing point cnnnot be determined with precision.
Page 51 - From the foregoing statements it may be safely inferred that " the mean height of the barometer at the level of the sea being the same in every part of the globe...
Page 80 - This last quantity was declared in 1799 to be the length of the legal metre, and vrai et deftnitif, and is the length of Lenoir's platina standard. Later and more extensive measurements in various parts of the globe, however, seem to indicate that this quantity is somewhat too small. The latest and most exact results we now possess, combined and computed by Bessel, would make the quarter of the meridian 10,000,856 metres, and the me"tre = 443-29979 Paris lines. Schmidt's computation would make it...
Page 80 - Schmidt's computation would make it 443.29977 lines, and both numbers are confirmed by Airy's results. The legal metre is thus, in fact, as Dove remarks, a legalized part of .the toise du Perou, and this last remains the primitive standard. But it must be added that a natural standard, in the absolute sense of the word, is a Utopian one, which ever-changing Nature never will give us. The metre is, for all practical purposes, what it was intended to be, a natural standard ; though it must be confessed...

Bibliographic information