282 



INDEX. 



PACE 



Thermometer, hypsometric lix-lx, ibi 



correction for temperature of mercury in 

 stem xix-xx, 14 



Thermometric scales, defined xv-xvi 



intercnnversion of xvi, 2-4 



Thiesen, M.. work cited Ixii, Ixiv 



Time, 



arc into xxiv, 50 



into arc xxiv, 51 



mean, at apparent noon xxvi, 57 



mean solar into sidereal xxvi, 58 



sidereal into mean solar xxvi, 58 



Toise, value of 48 



Transmission percentages of radiation through 

 moist air Ixxxii, 239 



Twilight, duration of astronomical ... .Ixxviii, 223 

 duration of civil Ixxviii, 224 



Vapor, aqueous, decrease of pressure with al- 

 titude at mountain stations Ixxii, 202 



precipitable water equivalent 



Ixvi-lxviii, 176-178 

 pressure of, by psychrometric observations, 



English Ixviii-lxxi, 180-193 



Metric Ixviii-lxxii, 194-201 



pressure of saturated, 

 over ice. 



Dynamic Ixi-lxvi, 173-174 



English Ixi-lxv, 164 



Metric Ixi-lxvi, 169 



over water. 



Dynamic Ixi-lxvi, 175 



English Ixi-lxv, j 65- 168 



Metric Ixi-Ixvi, 170-172 



(See also atmospheric water vapor) 



1 • Vage 



vapor, aqueous 



specific gravity Ixvi-lxvii 



weight of 



English .Ixvi-lxviii, 176 



Metric Ixvi-lxviii, 177-178 



Vara, values of. 



Mexican 48 



Spanish 48 



Versta or Werst, value of 48 



Visibility, horizontal code for Ixxxvi, 246 



Visible spectrum, water vapur lines in 



Ixxxii, 237-238 



Waals, J. D. Van der, work cited Ixii 



Water, vapor of (see Aqueous 1 

 Weather, state of, Beaufort symbols for 



Ixxxvi, 245 

 Weight, of saturated aqueous vapor. 



Cubic foot Ixvi-lxviii, 176 



Cubic meter Ixvi-lxviii, 177-178 



in grams, of a cubic centimeter of air, 



English Ixxx-lxxxi, 228-231 



Metric Ixxx-lxxxi, 232*236 



Werst or versta, value of 48 



Wind tables xxviii-xxxii, 64-73 



Wind. ' 



true direction aiid velocity at sea, de- 

 termination of xxx 



gradient, velocity of xxx-xxxii, 71-73 



radius of critical curvature 



xxx-xxxii, 71-73 



scale, Beaufort's xxviii-xxix, 70 



synoptic conversion of velocities. .. .xxviii, 64 



Year, days into decimals of. and angle. xxiv, 52-55 

 tropical, length of xxvi 



