INDEX 



Paragraph 



Angles, reading and recording in single-theodolite observations 83,84,85 



in two theodolite observations 153 



in tail method observations 189-190 



preparation for slide rule when over 90° 161, 162, 163 



Baselines, length, bearing, etc 5,46 



Computation, methods of 102, 170 



single-theodolite 105,106,110 



formula used 105 



slide rule used 103, 104 



when elevation angles are below 45° 107 



when elevation angles are above 45° 108 



two-theodolite.. _ 158 



formulae used 161 



slide rule used 159 



with balloon in vertical plane through baseline 165,166 



curvature of earth, correction for 175-179 



influence of optical refraction 180 



tail method 181-190 



Errors, detection of 115,124 



Explosions, dancer of 68 



Forms used in pilot balloon work 128-147 



mailing to central office 148 



Graphing board, construction of 122 



Horizontal projection of path of balloon 112 



construction of 112-115 



for two-theodolite observation 173 



obtaining wind data from 117, 174 



Inflation balance, description of 58-62 



use of „ 63-66 



Lightins: device for theodolite 101 



Meteorological data, recording of 71 



Night observations 98 



lanterns used in 98,99,100 



lighting of 100 



electric lighting units for 98 



North Point, determination of 36,37,38 



by culmination of Delta Cassiopea and Mizar. 39,40,41 



by setting on Polaris.. _ 42,43,44 



by observation of sun at true solar noon 45 



Observation platform, construction of 9 



Observation points, selection of , 1,2,3 



marking of 8 



Observation, time of 69 



omission of 96,97 



preparation of balloon for_ 47,48,57 



steps in 70 



timing of 73,152 



two-theodolite. 150,151 



obtaining wind data from 174 



reading angles in 154 



recording data in 155 



time signaling in 152 



use of telephones in 152 



Orientation points, bearing of, etc 46 



Pilot balloons, size, color, etc 47 



ascensional rate of 52, 53, 54 



additive corrections applied to .. 53 



color, selection of for observation 48 



coloring of 50 



deterioration of " 51 



disappearance, causes of _ . . 89 



due to clouds 90,91 



due to distance, haze, etc 92 



fastening neck of _. 67 



height to which they will ascend 47 



inflation of 50, 57 



when lanterns or electric lighting units are used 98,99, 100 



patching of 49 



releasing of 76 



with lanterns attached 98 



sighting and following... 78-82 



Plottins board, construct ion of 111 



Resultant wind direction and velocity, computation of 142, 143, 144 



67 



