Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 191.—Ammeter Balance Beam Gravity—Westinghouse Type. AMMETERS. 203 accommodateitself the linesof the magnetism. Fig. 192.—Thomson Inclined Coil Ammeter. ance of the instrument being about .0001 ohm. The instru-ment may be calibrated for an alternating or direct currentcircuit. 207. Thomson Inclined Coil Ammeter. —In many typesof ammeters, beside the above, the magnetic body is apiece of iron, rather than a magnet, and placed so that itwill gradually move to throughof
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 191.—Ammeter Balance Beam Gravity—Westinghouse Type. AMMETERS. 203 accommodateitself the linesof the magnetism. Fig. 192.—Thomson Inclined Coil Ammeter. ance of the instrument being about .0001 ohm. The instru-ment may be calibrated for an alternating or direct currentcircuit. 207. Thomson Inclined Coil Ammeter. —In many typesof ammeters, beside the above, the magnetic body is apiece of iron, rather than a magnet, and placed so that itwill gradually move to throughof Thomson inclinedcoil ammeter utilizes thisprinciple and is con-structed in the portableand switchboard pat-terns. A view of theportable type, with coverremoved, is shown inFig. 192, and a sectionalview in Fig. 193. A cir-cular coil of wire, C, ismounted with its axis inclined to the horizontal. Through thecentre of the coil is passed a vertical shaft mounted betweenjewel centres and carrying a pointer at its upper end. A smalliron vane, A, is attached to the shaft at an angle, and themovable system is controlled by the two flat springs, S. When current is passed throughthe coil the vane tends to turnagainst the ac
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
