278 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



is represented iu Figure 6. In this case the hot-wire ammeter reading 

 was taken in the secondary circuit as an inductance, in series with the 

 primary of the oscillation transformer, was varied, the abscissa scale 

 being in turns of the coil. The disconnected curve, marked Xi, repre- 

 sents the primary fundamental wave length plotted to turns of iuduct- 



230 



210 



O 



Z 



UJ 



190 



170 



150 



> 



< 



CO 



111 



UJ 



5 



130 

 2 4 6 8 10 



TURNS OF INDUCTANCE. 



Figure 6. Curve showing Syntony to Wave Form. 



Ao = 86 meters. 

 lo = .75 ampere. 

 Ci = 60 X 10-5 m/. 

 Cs = 40 X 10-5 M./. 



ance. The curve of secondary current shows the marked maximum 

 when, the I. C. F. remaining constant, the primary discharge loop has 

 the best duration compared to the period of the secondary oscillation. 

 The forcing by the secondary oscillation of the primary to discharge 

 at the frequency corresponding to a wave length of 138 meters is well 

 shown by the Xj curve. 



A very interesting and useful chart, in showing the way in which the 

 variables change, is shown in Figure 7. This diagram was taken for 



