178 Proceedings of Indiana Academy of Science 



AN OSCILLOGRAPHIC STUDY OF AN INDUCTION COIL 

 WITH HIGH FREQUENCY LOAD. 



F. O. Anderegg and K. B. McEachron, Purdue University. 



A report was made to this Academy a year ago on a Chemical 

 Study of a High Frequency Corona Discharge'. During the preliminary 

 work a large induction coil capable of throwing a 40 cm. spark was 

 connected to the Tesla coil as described in that reference. The source 









Vvx. 1. An <jsoilio'4r;:ph showiii:-; that the wave form of the voltajic fiom a tertiary 

 coil wound outside of the secondary coil of an induction coil is the same as the alter- 

 natins' voltaKe impie.'-scil upfin the |)riniary coil, all three coils boini^' concentric. 



Fig. 2. The wave forms of the eurrcnl ami vollancs of the primaiy circuit of a 

 lar.^e induction coil. The current was supplied by an S-pole d.c. Kcneratoi-. explaininu 

 the small waves. 



of supply for the primary of the induction coil was the campus direct 

 current at 100 v. The yields of ozone obtained with this arrangement 

 were very unsatisfactory as to consistency of results. Later, a tran.s- 

 former was used in place of the induction coil with much better results. 

 A General Electric oscillographic apparatus being available, a study 

 was made of the induction coil to see if the variations could be explained. 

 The secondary current could be obtained directly with the aid of 

 a sensitive element. To get the secondary voltage a tertiary coil was 



' Pioc. Ind. Aca(i. Science. li)21. ii. l.'iT. 



'Proc. .'iSth Meeting-. 1922 (192:!).' 



