A NEW CURRENT WKHWKR, KTC. 



489 



suspended cylinder No. 2 is about 1 in 10,000 ; the larger ends of these cylinders are 

 the ends which were in contact during the turning. The ellipticity of the coils on 

 the fixed cylinders is greater than that of" the suspended coils, but it is much too 

 small to influence the calculation of the mutual induction, for the variation of mutual 



PLANE Of MEASUREMENT 

 S 6 7 S 9 IO II 



IZ IS 



38 



80 







"e 



85 

 o 



ISO 



ELLIPTIC! T Y 



Fig. 13. Suspended cylinder No. 1. 



induction with small changes in radius is approximately linear. For the same reason 

 the conicality of the coils may be neglected. The larger end of each fixed cylinder is 

 that which was secured to the face plate of the lathe during the final turning and 

 screw cutting. 



VOL. OCVII. A. 3 R 



