Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . the extent of the charge;(2) by the proximity of a part to some surrounding object; and (3) bythe condition of the atmosphere, as regards its moisture. As the patient 666 LECTURES ON NEEVOUS DISEASES. moves liis finp:or-tips mwr tho <loor-c:isin; or some article of furnitnrenot insnhited, you may be uble to perceive tliis esctipe of electricity, evenin a strong light. Now we have a condition which is knoAvn as static insula
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . the extent of the charge;(2) by the proximity of a part to some surrounding object; and (3) bythe condition of the atmosphere, as regards its moisture. As the patient 666 LECTURES ON NEEVOUS DISEASES. moves liis finp:or-tips mwr tho <loor-c:isin; or some article of furnitnrenot insnhited, you may be uble to perceive tliis esctipe of electricity, evenin a strong light. Now we have a condition which is knoAvn as static the machine is a powerful one, it may be carried to a high point. Thepatient happens to be charged, in Fig. 17G, with positive electricity,because he is connected with the positive pole of the machine. The final step consists in presenting to the part which you wish toinfluence a brass ball on the end of an insulated handle. This electrodeis connected, as you see, with a gas-pipe by means of a brass chain. Awater-pipe makes an equally good connection. When this ball reachesa certain degree of proximity to the patient,* 3ou notice that a discharge. Fig 176.—The Indiukct Spakk. of the accumulated electricity occurs in the form of a spark. This isknown as the indirect spark, because the electricity takes an indirectcourse (through the earth) to form a circuit. It leaps from the patientand escapes to the earth down the gas-pipe or whatever grounding theelectrode may chance to have. The length of tlie indirect spark is directly proportionate to thegenerating power of the machine—supposing, of course, that all otherfactors in the application are equal (such as the humidity of the atmos-phere, the completeness of insulation, etc.). *The lensjth of the ppark elicitcil depends on the power of tlie macliine, the drynessof the atmosphere, and tlie perfection of the insulation of the patient. I frequently havedrawn a spark of cio;lit inches by this method. STATIC ELECTKICITY. 6
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