. How to make and use electricity ... A, 4 inches in diameter and 3 inches thick, cuta circular hole and insert a large-sized test tube B, about 6inches long, that will just fit in the hole. Take an (No. 20) in-sulated copper wire about 6 feet long, wind the central portioninto a coil C, with turns about 1-8 inch apart, leaving about 3or 4 inches at both extremities unwound. To these fasten orsolder pieces or strips of copper and amalgamated zinc aswide and long as the interior of the test tube will permit, andallow them to be separated. Insert them in the tube, andcover with dilute sulphuric
. How to make and use electricity ... A, 4 inches in diameter and 3 inches thick, cuta circular hole and insert a large-sized test tube B, about 6inches long, that will just fit in the hole. Take an (No. 20) in-sulated copper wire about 6 feet long, wind the central portioninto a coil C, with turns about 1-8 inch apart, leaving about 3or 4 inches at both extremities unwound. To these fasten orsolder pieces or strips of copper and amalgamated zinc aswide and long as the interior of the test tube will permit, andallow them to be separated. Insert them in the tube, andcover with dilute sulphuric acid (1 to 20). In the center ofthe coil lay a No. 16 soft iron wire D, and float the whole in avessel of water. The apparatus constitutes a small floatingbattery and electro-magnet. Bring one end of a permanentmagnet, or a short piece of soft iron wire E, suspended ina paper stirrup N, near to one of the poles of the core of thefloating battery, and prove by experiment that the coil and itscore behave in every respect like a Remove the iron wire from the floating electromagnet andbring a separate battery wire over and parallel with the helix,as in Figure 6. In this position the two currents flow inplanes at right angles to one another. Immediately the coilturns and tends to take a position at right angles to the wireabove, so that the two currents may flow in parallel planesand in the same direction as in Figure 7. It will be observedthat the action of the helix in the last experiment is analogousto the deflection of a needle by an electric current. Place op^posite one end of the floating battery a second helix, Figure 8,in such a manner that the currents in the two helices mayhave the same direction. The two poles of the helices attractone another in conformity to the law previously the poles of the helix in your hand so that the cur-rents will flow in opposite directions, though still parallel;they repel one another. The two helices appear to be po
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectricity, bookyear
