. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. chap, xv.] MEDICAL BATTERIES. 151 the movement of the sledge increases the number of cells in circuit without breaking the circuit. Opening and closing shocks are, therefore, avoided. The B sledge has binding screws for the attachment of wires. It also has an arrangement c which acts both as key and commutator. When the handle is perpendicular no current is passing; when it is turned back the right- hand binding screw is positive; wh
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. chap, xv.] MEDICAL BATTERIES. 151 the movement of the sledge increases the number of cells in circuit without breaking the circuit. Opening and closing shocks are, therefore, avoided. The B sledge has binding screws for the attachment of wires. It also has an arrangement c which acts both as key and commutator. When the handle is perpendicular no current is passing; when it is turned back the right- hand binding screw is positive; when it is turned fortvard the left-hand screw is positive. Thus the circuit may be interrupted and tbe direction of the current altered. By this arrangement, therefore, any strength of current may be used, and the current may be inter- rupted or sent in any desired direction. The Leclanche battery is the one now largely in use for medical purposes. It is compactly put up in boxes containing twenty, forty, or more cells. Each cell is about the size of a two ounce bottle, and is divided into two compartments by a porous partition, on one side of which is zinc in sal- ammoniac solution, and on the other gas carbon and native pyrolusite moistened with water (page 23). Fig. 79 is a representation of the cover of such a battery, s h ow i 11 g a dial plate a, with a series of brass Studs, Fig. 79.—The Leclanclie Battery. each stud having a number marked 011 it. A hand can be turned over the dial and caused to make contact with one stud after another. When it makes contact with a stud the number attached indicates the number of elements in circuit, the binding screws for connecting with wires being always the same. The contact-point of the hand should be so made that when exactly over one stud it does not touch the stud 011 either side, but when being moved to a new position it ought to he. Please note that these images are extracted from scanned page images that may have been digital
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