Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 704 PHYSIOLOGY charging battery. In order to get great extent of surface, a condenser is built up as in the diagram (Fig. 320) of a very large number of plates of tinfoil, separated by discs of mica or paraffined paper. Alternate discs are connected together : thus 1, 3, 5 are connected to one pole, while 2, 4, 6 are connected to the other. The rheocord is used to modify the amount or strength of current flowing through a preparation. One form of it is represented in Fig. 321. A constant source
Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 704 PHYSIOLOGY charging battery. In order to get great extent of surface, a condenser is built up as in the diagram (Fig. 320) of a very large number of plates of tinfoil, separated by discs of mica or paraffined paper. Alternate discs are connected together : thus 1, 3, 5 are connected to one pole, while 2, 4, 6 are connected to the other. The rheocord is used to modify the amount or strength of current flowing through a preparation. One form of it is represented in Fig. 321. A constant source of current at b causes a flow of electricity from a to b through a straight way. As the resistance of this wire is the same throughout its length, the fall of potential from a toh must be constant. The nerve, or whatever preparation that is used, is con- nected with the straight wire at two points, at a and at c, ^^j^i^^>*= by means of a sliding contact or rider. Supposing that there is an electromotive difference of one volt between a and b, it is evident that if c is pushed close to b, the acting on the nerve will be also one volt. The however may be made as small as we like by sliding c nearer to a. Thus if a b is one metre, and there is a differ- ence of one volt between the two ends, then if c be one centimetre from a, the acting on the nerve will be roo' volt. Thus we alter the current passing through the nerve by altering the which drives the current. The galvanometer is an instrument used to measure strength of current. Its construction depends on the fact that, if a small compass be suspended within a coil of wire and a current be passed through the wire, the compass is deflected, and tends to take up a position at right angles to
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