Gilley, Frank M · Boston, Allyn & Bacon · leaf 417
ichhave binding-posts to which wires are connected. Touch the 406 PBINCIPLES OF PHYSICS. ends of the wires together, being sure that the covering, orinsulation, is off of the ends of the wire. From which stripdo the bubbles come now ? Place vertically, pointing north and south, a coil of… … Fig. 377. is somewhat more sensitive with the needle in that posi-tion. To the ends of the coil, or to the binding-posts towhich the ends are attached, fasten the wires from, the zincand copper strips shown in Fig. 376. Notice the effect uponthe needle. Interchange connections and note effect. A…
Physics
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-1227-543.webp)
