INDEX. 



PAGE 



Absolute thermometric scale defined xi 



Absorption, by atmospheric water-vapor bands in in- 

 fra-red lxxi, 230 



Air, coefficient of expansion xxxix, xli 



density of, at different humidities, 



English lxix-lxx, 221-223 



Metric lxix-lxx, 225-228 



density of, at different pressures, 



English lxix-lxx, 221-223 



Metric lxix-lxx, 225-228 



density of, at different temperatures, 



English Ixix, 220 



Metric lxix-lxx, 224 



mass of, corresponding to different zenith dis- 

 tances of the sun lxviii, 218 



weight in grams per cubic centimeter 



xli, lxix-lxx, 220-228 



Angle, conversion of days into xx, 52-55 



Angot, A., treatise cited lxviii 



Approximate absolute thermometric scale defined . . xi-xii 

 Approximate absolute temperature, conversion into 



Centigrade, Fahrenheit, and Reaumur xii, 2-4 



Aqueous vapor, decrease of pressure with altitude 



at mountain stations lxi, 194 



pressure of, by psychrometric observations, 



English lvii-lx, 172-185 



Metric lvii-Lxi, 186-193 



pressure of saturated, 

 over ice 



English lii-lv, 160 



Metric lii-lv, 165 



over water, 



English lii-lv, 161-164 



Metric lii-lv, 166-168 



(See also atmospheric water vapor.) 

 weight of, 



English lv-lvii, 169 



Metric lv-lvii, 1 70 



Arc, conversion into time . xx, 50 



Aschkinass, Rubens &, treatise cited 231 



Astronomical twilight, defined lxvi 



duration of lxvi-lxvii, 215 



Atmospheric pressure, in units of force, .xvii-xviii, 36-39 

 Atmospheric water vapor, 



absorption by, in infra-red lxxi, 230 



lines in visible spectrum lxxi, 229-230 



August, work cited _ lvii 



Avoirdupois, conversion into metric xxiii, 60 



Babinet, barometric formula for determining heights 



xlix, 157 



Ball, Frederick, work cited lxvii 



Bar, value of defined xvii 



Barometer, 



correction for (in determining height), 

 gravity and weight of mercury, 



English xliii, 140-141 



Metric xlvii, 153 



humidity, 



Dynamic xlvi-xlvii, 152 



English xliii-xliv, 142 



Metric xlvi-xlvii, 149-151 



temperature, 



English xlii-xliii, 138-139 



Metric xlv-xlvi, 147-148 



Variation of gravity with altitude, 



English xliv, 143 



Metric xlvii, 154 



determination of height by, 



Babinet's formula xlix-1, 157 



Laplace's formula xxxix-xli 



Dynamic xliv-xlviii, 145-154 



English xli-xliv, 134-143 



Metric xliv-xlviii, 144-154 



t, PAGE 



Barometer, 



difference in height corresponding to, 



a change of 0.01 inch xlviii, 155 



a change of 1 mm xlix, 156 



pressures corresponding to temperature of boil- 

 ing water 1 — 111, 158 



reduced to, 



standard gravity xxxiv-xxxviii, 129 



English xxxvii-xxxviii, 130-131 



Metric xxxviii, 132-133 



standard temperature xxx-xxxiv 



English xxxii-xxxiii, 86-105 



Metric. xxxiii-xxxiv, 106-128 



value for auxiliary formula in determining height, 



Dynamic xlv, 145-146 



English xlii, 134-137 



Metric xlv, 144 



Barometric constant xl-xli 



Baumann, A., treatise cited lii 



Beaufort, Admiral, 



weather notation lxxii, 236 



wind scale xxiv-xxv, 70 



Belli, work cited lviii 



Bemporad, A., treatise cited lxviii 



Bowie, William, work cited xxxv, lxiii 



Broch, work cited xxxii, lii-liii 



Buckingham, Edgar, work cited xv 



Cederberg, I. W., treatise cited liii 



Centigrade, conversion into Approximate Absolute, 



Fahrenheit, and Reaumur xii, 2-4 



conversion into Fahrenheit xiv, 10-12 



differences into differences Fahrenheit. . . .xv, 13 



near boiling point of water xiv, 13 



thermometric scale defined xi 



Chappuis, Pierre, work cited xviii 



Civil twilight, defined lxvi 



duration of lxvii, 216 



Clarke, treatise cited xli, lxiv 



spheroid •■•■•_ •_ xx, lxiv 



Cloud classification, international lxxii, 234-235 



Coefficient of expansion of air with temperature. xxxix, xli 

 Continental measures of length and equivalents . . . xx, 48 

 Conversion of, 



barometric readings into standard units of 



pressure xvii, 36-39 



linear measures xvi, 16-48 



measures of time and angle xx, 50-58 



measures of weight xxiii, 60-62 



thermometric scales xi-xiv, 2-13 



wind velocities xxiv, 64-70 



Correction, 



in determining heights by barometer, 

 for gravity and weight of mercury, 



English xliii, 141 



Metric xlvii, 153 



for humidity, 



Dynamic xlvi-xlvii, 152 



English xliii, 142 



Metric xlvi-xlvii, 149-151 



for temperature, 



English xlii-xliii, 138-139 



Metric xlv-xlvi, 147-148 



for variation of gravity with altitude, 



English xliv, 143 



Metric xlvii, 154 



for temperature of emergent mercurial column 



of thermometers xv, 14 



Davis, H. N., work cited lvi 



Days, conversion into decimals of year and angle 



xx, 52-55 

 conversion of decimals of, into hours, minutes, 

 and seconds xxi, 56 



