CONTACT-MAKING TAMBOUR. 



353 



wires is connected with terminals h and i by a coil 

 of thin copper wire. A light bent blade-spring is 

 inserted between the ebonite block and the bracket, 



to resist the motion of the arbor G. The beam 

 d y e has platinum soldered on the part where the 

 platinum ends of the wires are to touch. A ter- 



2 A 



