A. W. Ewell — Air in an Intense Electric Field. 377 



The complete electrical characteristics of any type of 

 Siemens ozonizer may be approximately calculated from the 

 relations given above, if the dimensions, and the dielectric 

 constant of the dielectric for the particular frequency 

 employed, are known. The minimum potential is obtained 

 from equation (5). B, fig. 2, may be calculated from equation 

 (3), adding h to the numerator, and C from equations (1) and 

 (2) and then the ionization current ' per square centimeter, 

 when large, is given by equation (4) , on substituting for V 



Fig. 6. Influence of Temperature. Abscissae = volts. Ordinates = milli- 

 amperes. I, II, III, Electrodes against # 59 cm of plate glass. IV, V, VI, 

 •59 cm of glass +'43 cm of air. Temperatures. I, 63° ; II, 20°; III, 7°; IV, 

 54° ; V, 18° ; VI, 5°. (These observations are uncorrected ; see text.) 



the value found for (7, and the power factor may then be 

 calculated. 



The ratio of current to electric intensity is greatest in curve 

 V 1 of fig. 3, where 7 milliamperes are maintained by an 



electric intensity, E, of — ~~ . Substituting in the equation 



2-41 



n e v F 



