. Practical electricity in medicine and surgery. he manner in which? the electrodes are applied, all control, to a greater or less degree,the available strength of current at the point of , in order to determine exactly how much current istraversing the tissues, and, probably, doing certain work there inmodifying nutrition, etc., a means is desirable by which we canmeasure the current, to find out, as it may be expressed, thedose of electricity which we are administering to the an apparatus is at our command in the so-called absolutegalvanometer or milliamperemete
. Practical electricity in medicine and surgery. he manner in which? the electrodes are applied, all control, to a greater or less degree,the available strength of current at the point of , in order to determine exactly how much current istraversing the tissues, and, probably, doing certain work there inmodifying nutrition, etc., a means is desirable by which we canmeasure the current, to find out, as it may be expressed, thedose of electricity which we are administering to the an apparatus is at our command in the so-called absolutegalvanometer or milliamperemeter, shown on the following page. 234 PRACTICAL ELECTRICITY IN MEDICINE AND SURGERY. The milliampere lias been adopted by common consentamong therapeutists as the electro-therapeutic unit, and it hasbecome customary to record the strength of the galvanic currentused in any case in milliamperes (Ma). While the use of thisinstrument has only very recently become general, and no fixedrules as to the measured current strength to be used in all dis-. FlG. 194.—MlLLIAMPEREMETER. eases have yet been established, certain important results havealready been obtained to which reference will be made in thenext chapter. Electrolytic operations, especially, have yieldedmuch more definite results since the measuring of the currentused has been more regularly practiced. MILLIAMPEUEMETER. 235 It is therefore most earnestly urged upon the practitionerwho uses the galvanic current that the milliamperemeter shouldbe a constant accessory to the battery in the application ofelectro-therapy and diagnosis. The proper construction of thisinstrument has been described in the first part of this all stationary batteries now made by the instrument-makersit is an essential part of the outfit. It should, in addition,be used also in measuring the current when a portable hatteryis used. Fig. 195 shows the instrument connected in circuitwith a portable battery. Rheostat, or Current Controller.—In the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectri, bookyear1890
