. Practical physical chemistry . 4V«ry3yT-iiVrrYTvrrryyw)-. w Fig. 60. The calibration bridge A consists of a strip of wood carry-mg II mercury cups. These cups are connected by 10approximately equal resistances, the sum of which should beabout the same as the total resistance of the bridge resistances, one of which should be marked differentlyfrom the others, are very suitably made of thin manganin wiresoldered to thick copper wires, the ends of vihich, previouslycleaned and amalgamated^ dip into the mercury cups (Fig. 61). In all measurements of electrical resistance or conductanc
. Practical physical chemistry . 4V«ry3yT-iiVrrYTvrrryyw)-. w Fig. 60. The calibration bridge A consists of a strip of wood carry-mg II mercury cups. These cups are connected by 10approximately equal resistances, the sum of which should beabout the same as the total resistance of the bridge resistances, one of which should be marked differentlyfrom the others, are very suitably made of thin manganin wiresoldered to thick copper wires, the ends of vihich, previouslycleaned and amalgamated^ dip into the mercury cups (Fig. 61). In all measurements of electrical resistance or conductance, wheneverconnections have to be made by means of copper wires dipping intomercury, one should invariably make it a rule to see that the ends of thecopper wires are rubbed quite clean, and, if necessary, freshly amalgamated. CONDUCTIVITY OF ELECTROLYTES 175 The ends of the calibration bridge are connected by non-resistance wires (thick copper wires), WW, to the ends of the Fig. 61. measuring bridge (Fig. 60); and the latter is also connected withthe seco
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