TABLES 



Page. 

 Tablk I. For computing the difference in the heights of two places from barometric 



observations 131 



II. Correction for the difference of temperature of the barometers at the two 



stations 134 



III. Correction for the difference of gravity in various latitudes 134 



IV. Correction for decrease of gravity on a vertical 135 



V. Correction for the height of the lower station 135 



VI. Differences of altitude from angular measurements for low angles and short 



distances 136 



VII. Differences of altitude from angular measurements for unit distance and high 



angles 152 



VIII. Corrections for curvature and refraction 153 



IX. Differences of altitude from angular measurements applicable to scale 1 : 45000. 154 



X. Differences of altitude from angularmeasurements applicable to scale 1 : 30000. 156 



XI. Differences of altitude from telemeter measurements ". 158 



XII. For converting wheel revolutions into decimals of a mile 162 



XIII. Constants 163 



XIV. Conversion table — metres into yards 163 



XV. yards into metres 164 



XVI. inches into metres and metres into inches 164 



XVII. metres into statute and nautical miles 164 



XVIII. .statute and nautical miles iuto metres 164 



XIX. Coordinates for projection of maps of large areas 165 



XX. Coordinates for projection of maps, scale 1 : 250000 175 



XXI. Coordinates for projection of maps, scale 1 : 125000 177 



XXII. Coordinates for projection of maps, scale 1 : 62500 180 



XXIII. Coordinates for projection of maps, scale 1 : 45000 185 



XXIV. Areas of quadrilaterals on the earth's surface, onedegreein latitude and in lon- 



gitude 186 



XXV. Areas of quadrilaterals on the earth's surface. 30 minutes of latitude and longi- 



tude 187 



XXVI. Areas of quadrilaterals on the earth's surface, 15 minutes of latitude and longi- 



tnde 188 



XXVII. Factors for the geodetic computation of latitudes, longitudes, and azimuths. . . 190 



XXVIII. Factors for reduction of transit observations 217 



XXIX. For reducing observations for latitude by Talcott's method 224 



