A Laboratory Manual of Electrotherapeutics

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Page 23 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 153 - I the amount issuing from the medium, we have alu=l, when a represents the fraction of the original amount of light which passes through the medium, on the supposition that the light extinguished is proportional to the original intensity of the light. The first series of experiments was made with the view of determining this point. The intensity of the chemical rays proceeding from a constant source of light was measured before and after passage through a cylinder with plate-glass ends, filled with...
Page 138 - It is, of course, applicable to every form of muscucular paralysis, for there is no practical stimulus to nerve and muscle except the electric, and none more energetic than this form of it " Its effects upon the Hallerian irritability of the muscular tissue necessarily includes an effect upon the local circulation of a part and upon the lymphatics, and to this may doubtless be referred many clinical results of relief, as in lumbago and all forms of muscular rheumatism, subacute and chronic rheumatic...
Page 156 - As to the usefulness of his discovery, Professor Herdman observes: " ' So far as these experiments go, they appear to show that alternating magnetic stress is in some way related to a quickened metabolism of tissue; that the magnetic energy goes through some sort of transformation and reappears as physiological energy. Growth can undoubtedly be accelerated by the use of electricity, but it must be admitted that the growth thus obtained is unhealthy, and in the end is disadvantageous to man or animal....
Page 23 - System of electro-magnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice 14.4521 grammes in mass, of a constant cross-sectional area, and of the length of 106.3 centimeters.
Page 120 - ... the high-tension, high-frequency currents impart an extraordinary activity to the nutritive processes of animal tissues, without disturbing to any extent the phenomena of conscious life. 88. In the majority of cases where these currents have been employed for therapeutic purposes, they have exercised a powerful and generally reparative action on diseases caused by, or attended with, feeble nutrition, by accelerating the organic changes and by increasing the activity of enfeebled or perverted...
Page 123 - Holtz machine for medical use have of late years furnished it with a small Wimshurst for the purpose of exciting action in the Holtz when it loses its charge, and the latest...

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