INDEX 



Abstract of log, 47-64 

 Atmospheric-electric laboratory, 3-4 

 figs. 1, 2, 21 



Batteries, 31, 32, 34, 35, 37, 42, 44, 

 45 



Conductivity, positive and negative, 

 apparatus 8A (CA8A) 

 eye reading, 



description, 3, 8 

 fig. 7, 23 



observer's reports, 36, 38, 

 41, 43 

 comments, 39 

 procedure for measurements, 

 8-9 

 location and description, 3 

 recorder, 



description, 9 

 figs. 9, 20, 21, 24, 28 

 installation, 4 

 observer's reports, 43, 44 

 discussion of results, 

 annual variation, 137 

 daily mean recorder values, fig. 



2, 163 

 diurnal variations, 137, 138 



figs. 3-6, 164, 165 

 land, effect of, 139 



fig. 8, 167 

 nuclei, effect of, 139 

 ratio of positive to negative, 138, 



139, 141-142 

 weather, effect of, 139 

 fig. 8, 167 

 methods for measuring, 2 

 tables of data, 



daily observations, 66-101 



explanatory note, 65 

 diurnal-variation observations, 

 105-112, 124-125 

 explanatory notes, 103, 123 

 Cosmic rays (see penetrating radiation) 

 Current density, air-earth, 

 change with latitude, 147 



fig. 15, 174 

 computation, 65 

 daily mean values, 146 



table 2, 146 

 daily range, 146 

 table 2, 146 

 discussion of results, 139 

 disturbance factors, 145 

 disturbed periods, 145,147-152 



tables, 148, 149, 150 

 diurnal variations, 145 



fig. 14, 173 

 tables of data, 



daily observations, 66-101 

 diurnal-variation observations, 

 105-112 

 explanatory note, 103-104 



Diurnal variation, 



observer's summaries, 31, 33, 34, 

 35, 37, 41, 43 



Diurnal variation, 



suggested schedule, 40, 41 



table, 40 

 tables of data, 105-112,114-121, 

 124-125 



Electrometers, 3 



Introduction, 1 



Ions, small, positive and negative, 

 apparatus, counter 1 (ICl) 

 description, 9-10 

 fig. 3, 21 

 location, 3 



observer's reports, 36, 38, 41, 

 43, 44 

 comments, 39 

 computation of content, 11 

 diminution, 1 



procedure for observations, 11 

 production, 1 

 tables of data, 



daily observations, 66-101 



explanatory note, 65 

 diurnal-variation observations, 

 105-112 

 explanatory note, 103 



Meteorological data 

 clouds, 66-101 



types, 65 

 daily notes in 

 log, 49-64 



tables, 105-112, 114-121 

 explanatory note, 104 

 relative humidity, 66-101 

 temperature, 66-101 

 weather 



notes, 66-101 

 symbols, 65 

 wind, 66-101 



Beaufort scale, 65 

 visibility, 66-101 

 scale, 65 

 Mobility of ions, positive and negative, 

 computation, 11 

 discussion of results, 

 effect of 



earth's field, 143 

 large ions, 143 

 observational errors, 144 

 frequency curves, 143-144 



figs. 11-13, 169-172 

 mean mobilities, tables, 144 

 tables of data 



daily observations, 66-101 

 diurnal -variation observations, 

 105-112 

 explanatory note, 103 



Nuclei, condensation 



concentration, 31, 32 

 counters 



description, 11-13 



figs. 13, 14, 25 



no. 2, observer's reports, 44 



177 



Nuclei, condensation, counters, 

 no. 4, 4 



observer's reports, 37 

 comments, 37 

 no. 5, 4 



observer's reports, 39, 42, 

 43, 44, 45 

 comments, 40, 42 

 discussion of results, 153-156 

 combination coefficients, 154- 

 156 

 change in magnitude, 156 



table, 154 

 computation, 155 

 diurnal variation, 154 

 fig. 17A and B, 175 

 land, effect of, 153 



fig. 16, 174 

 range of values, 153 

 relation to small ions, 154-156 



table, 154 

 volcanos, effect of, U ' 

 observations, 13 

 tables of data, 



daily observations, 66-101 

 diurnal-variation observations, 

 105-112 

 explanatory note, 103 



Penetrating radiation 

 apparatus 

 no. 1 (PRl) 



adjustments, 13-14 

 comparison with 5503, 14-15 

 description, 13 

 fig. 4, 22 

 location, 3 



observer's reports, 32, 33, 

 38, 41,43, 44, 45 

 comments, 32, 35, 37, 39, 

 42 

 no. 5503 (Kolhorster) 



comparison with PRl, 14-15 

 description, 13, 14 

 fig. 6, 23 

 location, 3 



observer's reports, 32, 33, 

 34, 35, 38, 41, 43, 44,45 

 comments, 39-40, 42 

 no. 5658, 44 

 discussion of results, 



average ocean value, 157, 158 

 latitude, change with, 157 



tables, 158, 159 

 residual ionization, 32, 35, 157, 

 table, 157 158 



table of data, 66-101 

 explanatory note, 65 

 Potential-gradient 

 apparatus 



eye reading, no. 2 

 description, 4 

 fig. 10, 24 

 location, 4 



meteorological observations, 5 

 observer's reports, 32, 33, 

 34 



