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 . -resistance to the current. 11. Keep your electrodes clean, ^s I have stated before, it is wellto cover them with fresh canton-flannel for every patient. This is anact of precaution which will impress ix-ojile with your regard for theirfeelings and for their safety from contact with infectious matter. Sponges STATIC ELECTKICITY. 647 are too expensive to be renewed so often. Absorbent cotton may oftenbe placed between the elect
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 . -resistance to the current. 11. Keep your electrodes clean, ^s I have stated before, it is wellto cover them with fresh canton-flannel for every patient. This is anact of precaution which will impress ix-ojile with your regard for theirfeelings and for their safety from contact with infectious matter. Sponges STATIC ELECTKICITY. 647 are too expensive to be renewed so often. Absorbent cotton may oftenbe placed between the electrode and its covering with advantage. STATIC ELECTKICITY.* An exposition of the ditlerent forms of generators which may beemployed, and the various methods of application of this therapeuticagent, together with hints respecting the care and management of induc-tion machines and the selection of apparatus, seems to be advisable in awork of this character. Most works on medical electricity are singularlydeficient in this field. We owe to the ingenuity of Otto V. Guericke, the inventor of theair-pump, the first electrical machine where friction was employed as the. Fig. 164.—Hawksbfes Original Electrical Machine. (From Lecons de Physique o( theAbbe Noliet, published in 1767 ) The globe is of glass, and positive electricity is collectedupon a conductor suspended by silken cords from the ceiling. exciting agent. It consisted of a ball of sulphur which was turned uponits axis by hand-power. An assistant grasped the ball with his hands,and, by so doing, served as a conductor for the escape of the positiveelectricit}^ to the earth. This primitiAC aflfair gave feeble sparks, whichcould only be seen in total darkness. Hawksbee substituted later a globe of glass for the ball of obtained more satisfactory sparks with the positive electricit}^ thusgenerated. Later still glass tubes wei-e used, with hand rubbing; and the}entirely superseded the globe as generators until the midd
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