File:American X-ray journal (1897) (14570253399).jpg

Identifier: americanxrayjour1418unse (find matches)
Title: American X-ray journal
Year: 1899 (1890s)
Authors:
Subjects: X-Rays Radiography
Publisher: St. Louis : American X-Ray Publishing Co.
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: Open Knowledge Commons and the National Endowment for the Humanities

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ly the same, a little en-ergy is necessarily lost during the trans-forming process by induction, 1 be it ei- 462 THE AMERICAN X-RAYJOURXAL. ther up or down,) in making the inter-change. THE DVNAMOTOR VERSUS THE INDUCTIONCOIL. In the study of the structure and function of the dynamotor one may considerit as the modification of the common in-duction coil, e. g. Faradic or Ruhmkorff.The field-magnets are the analogue ofthe primary coil, and its soft iron core,the armature is the homologue of tinsecondary, the effect obtained by revolv- ing mty OF THE DYNAMOTOR.When the armature of a dynamotor isat rest its potential is nearly zero, butit w ill gradually rise with the increase inrapidity of revolution; it is governed inthe same manner previously explainedfor the action of the armature of the dy-namo. If a current from a bank of lampsis supplied to the field-magnets, suita-bly wound, the armature of the dynamo-tor will revolve with increasing rapiditvand if there are many turns of wire en-
Text Appearing After Image:
FIG. 4. Electrically Driven Telegraph Plant. 20 Dynamotors. Western Union Telegraph Co., Buffalo, N Y. tering into its formation, the voltage willrise with each additional lamp turnedon, the range of potential being fromone to eighty volts, which is all the elec-tro-therapeutist can desire for the gal-vanic treatment of chronic diseases. Itmust be borne in mind that the cur-rents strength of any electrical devicebears little relation to the same af-ter the resisting tissues of the patienthave been placed in the circuit ; it be-comes in accordance with Ohms law, a ing the armature of a dynamotor resultsin the induction coil, from making andbreaking the primary circuit at the in-terrupter or rheotome. For the thor-ough understanding of the process of in-duction upon all electrical devices wemust not only try to comprehend whatoccurs in the conductors but also thecondition of stress, or strain caused bythe lines of force in the dialectric atmos-phere, in the air gaps surrounding theappar

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