Smithsonian Meteorological Tables Volume 35, No. 1; Based on Guyot's Meteorological and Physical Tables (Paperback)

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. 1893 Excerpt: ...the vapor pressuref, viz: /==/--0.000660 (t--(, ) 1 +0.00115 (/--/, ) It gives the vapor pressure to hundredths of a millimetre from--300 C. to 45.9 C., the intervals being 1 for temperatures below o C. and o.1 for temperatures above o C. Table 44, with the depression of the wetbulb t--/, and the barometric pressure as arguments, gives the value of the second term of the formula. The top argument is given for every l o millimetres from 770 to 460 mm.; the side argument t--/, is given for every whole degree up to 20. Tabular values are given to hundredths of a millimetre. From the two parts of the table we then have Vapor pressure, / (mm) = Table 43--Table 44. The temperature in Table 43, corresponding to the vapor pressure thua Example: ' Given / = 104 C.; /, = 8. . and = 740 mm., to find the vapor pressure and dewpoint. Table 43, with the argument /, = 8? ., gives/, =8.15mm. Table 44, with t--f, =21 and --740 as arguments, gives 1.03 mm. as the value of the last term of the expression for/. Hence we have the vapor pressure, /= 8.15--1.03 = 7.12 mm. The value of the temperature in Table 40, corresponding to this vapor pressure, is the dewpoint d = 6 . Table 45. Relative humidity--Temperature Centigrade. Table 45 gives the relative humidity of the air in hundredths, having given the air temperature t and the dewpoint d in Centigrade degrees. It is computed by the formula f Relative humidity =, f f and F being the maximum pressures of aqueous vapor corresponding to the temperatures d and / as given in Tables 36 and 43. The top argument is the dewpoint d, extending by 5 intervals from--15 to 30 C. The side argument is the depression of the dewpoint t--d, given for even' o?2 C. from o?o to lo....