TABLE OF CONTENTS. IX 



Table Page 



Determination of heights by the barometer — English measures — 



51 Values of 60368 (1 + 0.0010195 X 36) log. — — .... 134 



B 



52 Term for temperature 138 



53 Correction for gravity and weight of mercury 140 



54 Correction for average degree of humidity 142 



55 Correction for the variation of gravity with altitude . . . 143 

 Determination of heights by the barometer — Metric and dyna- 

 mic measures — 



760 



56 Values of 18400 log — 144 



B 



101^ % 



57 Values of 18400 log — 145 



B 



58 Temperature correction factor (a = .00367 d) 147 



59 Temperature correction (0.00367 Q X Z) 148 



60 Correction for humidity 149 



61 Correction for humidity. Auxiliary to Table 58 . . . . 151 



62 Correction for gravity and weight of mercury 153 



63 Correction for the variation of gravity with altitude . . . 154 



64 Difference of height corresponding to a change of 0.1 inch in 



the barometer — English measures 155 



65 Difference of height corresponding to a change of 1 millimeter 



in the barometer — Metric measures 156 



Determination of heights by the barometer — 



66 Formula of Babinet 157 



Barometric pressures corresponding to the temperature of the 



boiling point of water — 



67 English measures 158 



68 Metric measures 158 



HYGROMETRICAL TABLES. 



69 Pressure of aqueous vapor over ice — English measures . . . 160 



70 Pressure of aqueous vapor over water — English measures . . 161 



71 Pressure of aqueous vapor over ice — Metric measures . . . 165 



72 Pressure of aqueous vapor over water — Metric measures . . 166 



73 Weight of a cubic foot of saturated vapor — English measures . 169 



74 Weight of a cubic meter of saturated vapor — Metric measures . 170 

 Reduction of psychrometric observations — English measures — 



75 Values of e = e' - 0.000367.B {t - t') ( I + — ). . . 172 



V 1571 / 



76 Relative Humidity — Temperature Fahrenheit . . . . 183 

 Reduction of Psychrometric Observations — Metric measures — 



77 Values of e = e' — 0.000660 B (t — t') (1 + 0.00115 /') . . 186 



78 Relative humidity — Temperature Centigrade 192 



