The nursing and care of the nervous and the insane . nowing this, shewill be willing to be guided by the physician, and willnot be willing to take any improper risks on her ownresponsibility. Ordinarily the doctor directs the use of so many cells—fifteen, twenty, thirty, etc.—of a galvanic is not an exact standard. The current-strengthgiven by ten cells on one day will differ from that obtainedon another. It depends upon many varying circum-stances ; therefore when applications are gauged by cellsthe method is very inexact. A recently-invented in-strument enables the doctor to ord
The nursing and care of the nervous and the insane . nowing this, shewill be willing to be guided by the physician, and willnot be willing to take any improper risks on her ownresponsibility. Ordinarily the doctor directs the use of so many cells—fifteen, twenty, thirty, etc.—of a galvanic is not an exact standard. The current-strengthgiven by ten cells on one day will differ from that obtainedon another. It depends upon many varying circum-stances ; therefore when applications are gauged by cellsthe method is very inexact. A recently-invented in-strument enables the doctor to order the nurse to givea certain dose, and it enables the doctor or the nurse torecord the dose given. It is called a milliamperemetre.(Fig. 11.) All that can ordinarily be seen of it is aneedle, which is made to move across the arc of a circle. THE NERVOUS AND THE INSANE. 89 This is arranged from zero in the centre to fifty on eachside. These spaces measure so many milliamp&res. Amilliampere is resistance offered hy a human body to a Fig. THE MILLIAlirEREMBTRE. current of electricity which is generated by three Dan-iels elements,—that is, by three cells of a certain kindof battery. It is a term introduced by Dr. de Watte-ville, of London. Dr. Landon Carter Gray,1 of Brooklyn, describes themilliamperemetre made by John A. Barrett, which isshown in Fig. 11, as follows: The scale is graduated from one to fifty of these newunits. The working parts of the metre are enclosed ina case about four inches square at the base, and sixinches high, having a glass face showing pointer andscale. The pointer is attached to a movable magnetic 1 New York Medical Journal, July, * 90 THE NURSING AND CARE OF needle, which is a steel disk suspended between a sur-rounding coil of wire on two knife-edges, so as to oscil-late freely in a vertical plane. The movements of themagnet are indicated by the pointer on the scale. Themagnet is counterbalanced and held in equilibrium, sothat the po
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