388 jPiipin — JResonance Analysis of Alternating Currents, 

 b. Second test of the resonator indications. 



4. 



This test is represented graphically by diagram fig. 4. Two 

 transformers C and D had their secondaries connected in series. 

 The primary of the air-core transformer E formed part of their 

 circuit. The secondary of the transformer E was a part of the 

 resonator F. The .transformer C, a Stanley 5 K.W. (closed 

 magnetic circuit), was fed by the 10 H. P. alternator mentioned 

 above (130 p. p. s.), the transformer D of induction coil type 

 with a cylindrical core of fine iron wire was fed by a 1 H. P. 

 alternator with slotted armature (278 p. p. s.) Both alternators 

 were run simultaneously at full excitation. First, the primary 

 circuit of the large alternator was broken, so that the current 

 in the circuit CDE was due to the action of the small machine 

 alone. The resonator detected a resonant rise of 240 volts at 

 capacity -407 M. F. and another of 150 volts at capacity "044 

 M. F. These were evidently the fundamental and the first 

 odd harmonic. Then the circuit of the small machine was 

 broken and that of the large machine closed, so that the cur- 

 rent in the resonator was due to the action of the large machine 

 alone. The resonator detected a resonant rise of 220*1 volts at 

 capacity 1*78 M. F. This corresponded to the fundamental 

 frequency (130 p. p. s.) of the large machine. Finally both 

 circuits were closed, so that the current in the resonator was 

 due to the simultaneous action of the two machines. The same 

 resonant rises of potential were detected by the resonator and 

 at the same capacities as before, in perfect agreement with 

 theory. 



This experiment afforded another opportunity of testing the 

 theory which underlies this resonance method of studying the 



