The cylinder (Fig. 96) is used in conjunction with the afore-described pump, and constructed equal to that illustrated in Fig. 94.

The generators (Figs. 97 and 98), also manufactured by Bratby & Hinchliffe, Manchester, in different sizes, are arranged for steam and manual power. They are made entirely of rolled lead, having only one seam, which is burnt by machinery, thus rendering it impervious to the action of the acid.

The agitator shaft, as illustrated by Fig. 99, is made of copper, with heavy copper blades, and coated with tin.

Fig. 94. - Double Action Carbonating Machine.

The gas purifiers, as shown in Figs. 100 and 101, are used in preference to allowing the gas to be pumped direct from the gasometer. A greater purity is then ensured and this additional security is a guard against contamination. These purifiers are also of English manufacture and used in conjunction with the above apparatus. The gas from generator enters the purifier by the pipe showing downward arrow, and is cleansed during its passage through the water, and makes its exit through the pipe shown by upward arrow to the gasometer, when it may enter another purifier and get washed a second time before being pumped into the cylinder. These purifiers are made of strong Dantzic oak, bound with hoop iron, and the fittings are of gun metal, turned and polished.

Fig. 95. - Double Carbonating Pumps.

Fig. 96. - Separate Copper Cylinder.

Fig. 97. - Separate Vertical Generator.

Fig. 98. - Separate Horizontal Generator.

Fig. 99. - Agitator Shaft.

Fig. 100. - Gas Washer or Purifier.

Fig. 101. - Sectional View of Fig. 100.