as a reflector of sound waves. He gives directions for constructing the We illustrate in the cuts accompanying this article bles strikingly Bell's instrument of the 1876 patent. In interior surface of such form as to reflect the sound both of the systems, the armature is distinct from an object of… … cipal workingparts. Bindingpostsareattached posts. A tension spring is used to adjust the BOYAL E. HOirSE'S TELEPHONE 07 1868. to one of the arms of the pull df the pivoted arma- frame opposite to the mag- ture away from the mag- nets. Thus the frame net. forms the back piece of The box has…
