. St. Nicholas [serial]. FIG. 3. DIAGRAM OF SIX-POLE GENERATOR, END VIEW. A, commutator segments; B, brushes; C, coils of wire collectingpressure impulses; D, wire connecting negative brushes; E, wireconnecting positivebrushes; N-S, the field magnets —N, north poles;S, south poles; +, the positive, or outflowing, current; —, the nega-tive, or incoming, current. huge wheel thirty-two feet in diameter, and theyget from these machines a pressure of eleventhousand volts, and it takes an engine of eightthousand horse-power to run each of them. Al-. FIG. 4. DIAGRAM SHOWING SIDE VIEW OF ARMATURE WIND
. St. Nicholas [serial]. FIG. 3. DIAGRAM OF SIX-POLE GENERATOR, END VIEW. A, commutator segments; B, brushes; C, coils of wire collectingpressure impulses; D, wire connecting negative brushes; E, wireconnecting positivebrushes; N-S, the field magnets —N, north poles;S, south poles; +, the positive, or outflowing, current; —, the nega-tive, or incoming, current. huge wheel thirty-two feet in diameter, and theyget from these machines a pressure of eleventhousand volts, and it takes an engine of eightthousand horse-power to run each of them. Al-. FIG. 4. DIAGRAM SHOWING SIDE VIEW OF ARMATURE WINDING, THE COILS, C (CORRESPONDING TO C IN FIGURE 3), AND HOW THEY ARE CONNECTED TO THE COMMUTATOR SEGMENTS, A. N-S, FIELD MAGNETS. though the big wheel only turns over seventy-five times a minute, it is so big that the wires 1024 HOW ELECTRICITY IS GENERATED cut the magnetic fields at the rate of a mile anda quarter a minute. So quite a pressure is set upin each part, and there is room for a great manysections of wire around so large a wheel. But in order to use the pressure and currentgenerated by thus passing these wires throughthe magnetic fields, it is necessary to take it fromthe coils- and send it out over wire to where it isto be used. This is done in the commonest typeof machine by arranging at one end of the cyl-inder or one side of the wheel a ring of smallcopper bars, each one connected by a copper wireto some part of the revolving coils. This ring ofcopper bars is called a commutator. Small blocksof carbon, which is like com
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Keywords: ., bookauthordodgemar, bookcentury1800, bookdecade1870, bookyear1873
