s. A isa small tube, Figs. If now a wave of current passes through the paper, all fric- loose bundle of bristles is laid with its center exactly over tion ceases, and the spring not being pulled, the side of the one of the holes, a strong cord or thin brass wire is made to resonator regains its… … a’, attached to them in contact is made with the plumbago point very lightly; and MODE OF FASTENING BRISTLES IN TOOTH BRUSHES. sucha position that it may the resistance of the plumbago being but slightly reduced, a out again, when on drawing it taut the bundle of bristles is be within the tube, A,…
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