. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . *—^— UA/£. Connections of shunt-wound dynamo. Fig. 58. Multipolar dynamo. Other Types.—The description given above is that of the simplest andmost usual type of direct current dynamo, which is also that of thedirect current motor. Often the design is modified for special purposes 84 APPLICATIONS OF ELECTROMAGNETIC INDUCTION Thus, in the multipolar dynamo the field magnet has several pairs ofpoles arranged alternately around the armature. These modifications,however, will be readily understood by an
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . *—^— UA/£. Connections of shunt-wound dynamo. Fig. 58. Multipolar dynamo. Other Types.—The description given above is that of the simplest andmost usual type of direct current dynamo, which is also that of thedirect current motor. Often the design is modified for special purposes 84 APPLICATIONS OF ELECTROMAGNETIC INDUCTION Thus, in the multipolar dynamo the field magnet has several pairs ofpoles arranged alternately around the armature. These modifications,however, will be readily understood by anyone who is familiar withthe simpler type. Fig. 58 shows a common form of dynamo of themultipolar type. The commutator and one of the brushes may be seenin the opening of the casing which surrounds the machine and supportsthe field coils. The Alternating Current Dynamo.—If in the single coil dynamo,described on page 81, the commutator is omitted and the ends of thewire of the armature are connected to two rings on which the brushesrest (Fig. 59), the E. M. F. and the current produced will be alternating,as described on page 77. Such an appar
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