. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . New-model regtilating Oudin resonator. In Oudins resonator heavy copper wire wound helicallyabout a wooden cylinder forms the lower part of a tallcylinder. The upper part wound with finer wire (aboutfifty yards) is not traversed by the currents directly, but isthrown into vibration in resonance with that of the oscil-lating current passing through the larger wire at the to one point is the fine wire
. Radiotherapy and phototherapy : including radium and high-frequency currents, their medical and surgical applications in diagnosis and treatment ; for students and practitioners . New-model regtilating Oudin resonator. In Oudins resonator heavy copper wire wound helicallyabout a wooden cylinder forms the lower part of a tallcylinder. The upper part wound with finer wire (aboutfifty yards) is not traversed by the currents directly, but isthrown into vibration in resonance with that of the oscil-lating current passing through the larger wire at the to one point is the fine wire which encircles the Traite de radiologie medicale, Paris, 1904. 558 HIGH-FREQUENCY CURRENTS drum, and it is here that the potential is increased andthe resonance which led Oudin to name it resonator ; isproduced (Figs. 114 and 115). This form of harmonious vibration has its counterpartin music, the coils of the resonator vibrating more rapidlyin their remote portion than where stimulated by the current,just as the string of an instrument has a greater vibrationat the extremities than at the part which receives the primary Fig. Oudin type of resonator operated by coil. impact or impression. In other words, it is necessary toharmonize the vibrations. Rochefort constructed a doubleor bipolar resonator (Fig. 116) which Oudin has usedtherapeutically with satisfaction, and found that greaterintensity and quicker effect could be produced in con-ditions requiring more energetic treatment than with thesingle apparatus. There are various-sized solenoids of this type available,the smaller giving up to 200 milliamperes, being sufficientfor most methods of application, excepting that with the HOW THE CURRENT IS PRODUCED 559 large cage solenoid, as shown in Fig. 117, or with the auto-condensation couch. Rochefort recently showed me in his Paris laboratory theextensive magnetic electrostatic field which could be pro-duced by this bipolar apparatus. The limits of this fieldof action of t
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