. Practical physical chemistry . Fig. has already been 2?4 PRACTICAL PHYSICAL CHEMISTRY cell Wa can be put in circuit. C is the sliding contact on thebridge wire. The different connections are best made withflexible well-insulated If a two-way key Kj is not available, its place can be takenby the arrangement shown in Fig. 76, A. This consists of ablock of wood or of paraffin (obtained by melting paraffin andpouring it into a cardboard mould, the lid of a photographic

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