. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ; Fia. IS. Fig. 19. Figs. of dynamos. Fig. 20. magnetism constant, and hence the E. M. F. generated is independent of changes in the ex-teriud circuit. Roth the preceding types of machines may be regulated eithoii by iiltering thesi)eed or by varying the magnetism passing through the armature. Fig. 18 shows the methodof connection. ;}. Scries-Dyyiamo.—This is the type of machine now generally emp
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ; Fia. IS. Fig. 19. Figs. of dynamos. Fig. 20. magnetism constant, and hence the E. M. F. generated is independent of changes in the ex-teriud circuit. Roth the preceding types of machines may be regulated eithoii by iiltering thesi)eed or by varying the magnetism passing through the armature. Fig. 18 shows the methodof connection. ;}. Scries-Dyyiamo.—This is the type of machine now generally employed for arc-lighting,and which is specially adapte<l to furnish currents of constant strength. As shown in , the armature, tlie external circuit, and the field-magnet windings, are all connected inseries, so tliat the current is of equal strength in all parts of the circuit. Tliis type of ma-chine does not begin to generate current until it has attained a certain critical speed, asbelow this sfjced the magnets do not become excited ; tliis speed dejieiuls upon the resistanceof the circuit,. This type of nuichine is also liable to have its polarity reversed ; h
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
