ATMOSPHERIC IONS. 



143 



92. Data for ionization. In table 51 the date and hour are given in 

 the first and second columns. The fall of potential, V-v (v being the 

 fall in the absence of the aspirator air current), in volts, during the 

 ten minutes of observation, is shown in the fourth column, marked 

 "volts." From this the charge (Q) in electrostatic units per cubic 

 meter, and the number of ions (n) in thousands per cubic centimeter, 

 are computed. The sign of the charges is indicated in each case, and q 

 denotes their ratio (Q + /Q_). The correction (v) is regarded as negligible. 



Table 51. 



