Electro-diagnosis and electro-therapeutics : a guide for practitioners and students . a cell, for instance, numerous smallGerman-silver rods, in such a way that the current mustpass through them before reaching the human body,then the difficulty attending the passage of the currentincreases with the number of resisting substances placedin the connecting-arc of a cell. With a certain number of these inserted resistances,no portion of the current will be able to pass throughthe body. If it is possible to interpose resistance in in-creasing degrees, then the amount of the current to reach EXPLANA
Electro-diagnosis and electro-therapeutics : a guide for practitioners and students . a cell, for instance, numerous smallGerman-silver rods, in such a way that the current mustpass through them before reaching the human body,then the difficulty attending the passage of the currentincreases with the number of resisting substances placedin the connecting-arc of a cell. With a certain number of these inserted resistances,no portion of the current will be able to pass throughthe body. If it is possible to interpose resistance in in-creasing degrees, then the amount of the current to reach EXPLANATION OF THE APPARATUS 17 the body will gradually become less and less. This isaccomplished by the rheostat (in direct connection) Riieostatin ?^ ^ . ^ ^ Direct Current diagrammatically presented in Fig. 6, and in Figs. 4and 5 designated as B. Below the apparatus table areplaced German-silver rods, each of which leads to acontact-point on the surface of the table. A handleglides over these points of contact arranged in a the handle (0 in Fig. 6) is placed on the first. FIG. 6.—The Rheostat in Direct Connection. UTi, Rheostat; C, handle; K, human body. point of contact to the right of 0 (which would be uponthe contact-point 1 in Fig. 6*), then we see that the cur-rent would have to pass through all the little German-silver rods before it can reach the body. These littlerods offer so much resistance to the circuit that whenthe handle is placed thus no current can reach the body;no matter how many cells have been included by meansof the battery switch, the needle of the galvanometerremains fixed. But if we now turn the handle aroundto the right, less and less resistances will remain to thecircuit, more and more resistances will be excluded, so * There is a break at contact 0. 18 ELECTBO-BIA GNOSIS Rheostat in Accessory Connection that the passage becomes clearer and clearer for the cur-rent, and gradually more and more current can pass intothe body; and when the handl
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