144 



AUSTIN: CONDENSER LOSSES 



The results of the tests with the condensers in air are given in 

 Table I. 



TABLE I 

 Condensers in Air 

 Volts = 14,500 (Max.) Current = 7 to 8 Amps. Wave-length = 1,000 m. (About). 



Wireless Specialty (1). 

 Wireless Specialty (2) . 



Telefunken 



United Wireless 



Moscicki* 



Paper 



Compressed Air 



* It is not exactly correct to compare the Moscicki condensers with the jars 

 in air as the insulating liquid covers the edges of its conducting coatings. 



Special experiments showed that the slight difference in capacity 

 between the compressed air and the other condensers made no 

 observable difference in the results, the inductance remaining 

 the same. The paper condenser on account of its small capacity 

 was measured in parallel with a glass condenser of known loss and 

 its resistance deduced from these observations. 



Comparisons were also made by the same method between the 

 compressed air condenser and the different sets of Leyden jars, 

 the latter being immersed in a heavy transformer oil, the condi- 

 tions of the experiment being the same as before. Here no differ- 

 ence exceeding 0.05 ohm was observed between the jars and the 

 compressed air, indicating that the losses in the glass of the jars is 

 small compared with the brushing losses. 



Experiments were next tried with the three wireless specialty 

 jars immersed in oil at voltages from 4700 to 18500 (maximum). 

 The circuit containing the jars was the same as above except that 

 there was no spark gap, it being excited by a quenched gap circuit 

 to which it was coupled. The decrement was determined by 

 means of a wave meter in the usual way. Table II shows that 

 there was no certain increase observable with increasing voltage. 



