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To measure a small emf (of, say, a galva...

To measure a small emf (of, say, a galvanic cell or a thermocouple) the so-called balancing method is employed. The circuit diagram of this method is shown in the figure. Here ~x is the sought emf, is the source of current whose emf is much higher than ~x, G is a galvanornetcr with the zero in the middle of the scale, A is an ammeter, and R is the resistance box. How should one operate this circuit so as to ensure an accuracy in measuring ~x that is determined by the precision of the measuring devices?

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