Electricity, Its Application in Medicine and Surgery; A Brief and Practical Exposition of Modern Scientific Electro-Therapeutics Volume 1-2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 edition. Excerpt: ...in the face of Ohm's law C= (current equals tension divided by the resistance) without varying the tension when the resistance remains thesame, as is always the case? This is a mathematical problem the writer would like Dr. finge'lmann to solve for him. Surely, if C changes, we must change the value of E, when R does not change. We will now prove the error by a practical experiment, for the benefit of those who are not sufficiently versed in mathematics to appreciate the force of the above reasoning. Attach two electrodes to the secondary wire of Engelmann's finest or longest coil, place one electrode in each hand, now move the secondary coil gradually over the primary one, up to the point where the current just begins to be appreciable--suppose this to be 35 mm. from o. Now remove this coil and place Engelmann's coarsest wire or shortest coil in the same position, we find that the current is not appreciable. Why? Because the tension or electro-motive force of the first or longest coil was high enough to create a flow of current through the high resistance of the body of sufficient strength or volume to produce a sensory impression, while that electro-motive force set up by the second or shorter coil when in the same position with respect to the primary coil, was not sufficient to set up through the same resistance a current of similar strength. The fine wire or long coil, therefore, gives the greater tension, strictly in accordance with Engelmann's views. But let us now move the second or short wire coil a little further up the scale--say to 40 mm. from o, where we find that the current again becomes appreciable and feels just as it did when coming from the long wire coil when at the position marked 35 upon the scale. We have here produced the...show more

Product details

• Paperback | 46 pages
• 189 x 246 x 3mm | 100g
• Miami Fl, United States
• English
• black & white illustrations
• 1236552849
• 9781236552846