How to use a galvanic battery in medicine and surgery : adiscourse delivered before the Hunterian Society / by Herbert Tibbits.

  • Herbert Tibbits
Date:
1886
Catalogue details

Licence: Public Domain Mark

Credit: How to use a galvanic battery in medicine and surgery : adiscourse delivered before the Hunterian Society / by Herbert Tibbits. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    Alviays keep the socket on the lowest number and the lever on the highest, as putting socket ahead of lever would reverse the current Should, through any accident, a cell become disconnected or run down, or should it get out of order from any cause, it is onl}'^ necessary to short-circuit the cells and throw the milli- ampere-meter in circuit by adjusting the switch 10- By placing ■the socket on the pin marked O and selecting cell after cell with the lever, the defective cell is easily found by the milli- ampere-meter failing to deflect when the pin corresponding to the defect is reached. TO OBTAIN THE IXTEItRUPTED GALVANIC CURRENT. To obtain the interrupted galvanic current, move the switch at left of selector on to button marked interrupted, then turn the switch just above the vibrator on to its button marked 11, by adjusting the screws at 14 and 15 the proper degree of vibration will be obtained. It is necessary that the point of the screws at 15 should touch the plate with every vibration as the current passes through at this point and un- less it touches, connections would not be made. TO MEASURE THE RESISTANCE OF THE PATIENT. To measure the resistance of the patient turn the lever at the left of selector on to the button 8 marked milli-ampere- meter and wire rheostat. Supposing him to have the electrodes in his hands and a current from 30 cells registers 8 milli-am- peres; without changing any other conditions, throw the upper left-hand lever 10 on button marked rheostat and milli-ampere- meter only. The patient will now be thrown out and the needle will fly around as far as it can go. Begin b)'^ throwing in resistance, which is done by manip- ulating the top row of levers, until the needle which will have ]-etraced its course rests directly over the division marked 8 milli-amperes or whatever may have been the previously re- corded amount. The numbers on uncovered buttons added together will be the resistance of the patient. The known resistance having taken the place ^f the patient.
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