. A treatise on electrolysis and its applications to therapeutical and surgical treatment in disease . ither for series or groups or for mixed arrangements. This may be donereadily by a switch board like that shown in the annexed illustration(Fig. 57). The first desideratum of apparatus should be that of simplicity andeasy application. As most of the operations for electrolysis are of such anature that they will naturally be performed in a physicians office or at ahospital, it is not essential that the battery should be in a portable batteries are expensive, and when some of the
. A treatise on electrolysis and its applications to therapeutical and surgical treatment in disease . ither for series or groups or for mixed arrangements. This may be donereadily by a switch board like that shown in the annexed illustration(Fig. 57). The first desideratum of apparatus should be that of simplicity andeasy application. As most of the operations for electrolysis are of such anature that they will naturally be performed in a physicians office or at ahospital, it is not essential that the battery should be in a portable batteries are expensive, and when some of the auxiliary appara- APPARATUS AND INSTRUMENTS. !<•) tus which baa been described in the preoeding pages are combined in aportable form, they increase the expense very materially. A battery of twelve cells should Dot cosi a greal many dollars, and theBwitch board previously mentioned can be easily made for five dollars. A voltameter Cor measuring the current strength is a cheap matter, anda galvanometer with a roughly made resistance box or a water rheostalcan be obtained for a few dollars Fia. 5.—This diagram is intended t<» represeDl a combinationswitcb board. A A are two stripsof brass, each of which is connected with a pole cup, P C, to which the rheophores may be Bis the battery: the zinc of the first cell Zu 1, isconnected with the brass knob, 1; the copper ele-ment, c 8, is connected with the brass strip, A; the copper element of the last cell, c8,is connectedwith the brass knob c8, and the zinc of the same couple, Zu 7, is connected with the last knob c7;the intermediate battery elements are connected as marked in the diagram. It will be evident thatbrass plugs introduced in the various holes between the metallic strips and the numbered knobs willmake a connection in any desired combination; for instance, plugs inserted in a a a and 4 will con-nect the four cells in simple series; and plugs inserted in b b. bb, b b, and 4, will connect the cell
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