OF ARTS AND SCIENCES. 



97 



tional ; the figures in the upper line headed L, the various values of 

 the alternating line current in milliamperes ; and the figures in the 

 columns vertically beneath these last, the corresponding amplitude of 

 vibration of the diaphragm in thousandths of a millimeter. 



TABLE II. 



The results of a portion of the measurements are shown graphically 

 by the curves in Figure 1. Only series 1, 3, 5, 6, 7, 11, 13, 14, are 

 reproduced, as a greater number would have been likely to render the 

 diagram confused. The abscissas are excursions of the diaphragm in 

 thousandths of a millimeter ; the ordinates, the line currents in milli- 

 amperes. The several curves are numbered to correspond with the 

 serial numbers in the table. 



It will be seen from these results, that, as the strength of the mag- 

 net of the telephone increases, the amplitude of the vibration likewise 

 increases up to a certain limit, and then falls off. A comparison of 

 them with a curve representing the magnetization of the magnet as 



VOL. XXVIII. (n. S. XX.) 7 



