368 



ELEMENTS OF ELECTRICAL ENGINEERING. 



Fig. a. 



A body of mass m is sup- 

 ported by a flat spring S, 

 clamped in a vise as shown 

 in Fig. a. A force F push 

 ing sidewise on m moves it 

 a^ distance x, which is pro- 



Fig. b. 



A body of moment of in- 

 ertia K is hung by a wire 

 as shown in Fig. b. A 

 torque T acting on the body 

 will turn the body and twist 

 the wire through an angle 



Fig. c. 



A condenser C is con- 

 nected to the terminals of 

 a coil of inductance L as 

 shown in Fig. c. An elec- 

 tromotive force E acting 

 anywhere in the circuit 



