516
MODERN GASWORKS PRACTICE
in the fracture of the shaft The washing appliance consists of bundles of corru-gated wrought-iron sheets, the corrugations of alternate sheets Crossing one another diagonally. The bundles (Fig. 320) are attached togethor so as to form a complete circle, and are fixed to the central shaft by means of double collars. The collars are made of such a size as to obstruct the direct passage of the gas from bay to bay and to cause it to take a circuitous path. in contact with. the wetted bundles. In order to preclude still further the possibility of “ slip ” a special arrangement of lead rings is fitted so as to bear upon the collar and completely close any gas way
Fig. 320.— Cobrugatbd-Ikon Bündle fob “Standard” Machine.
except through the bundles. The arrangement is clearly seen in Fig. 319. The liquor flows from bay to bay by means of the extemal sloping pipes shown. its usual depth being rather less than one-third of the diameter of the machine. When tlie machinp. is used for cyanide extraction the corrugated-iron bundles are replaced by a somewhat similar pattem made from wood.
The Whessoe washer-scrubber (Fig. 321) is very similar in construction to that described above, and is, in faet, worked on the same lines as the Kirkham and Chandler machine. Wooden bundles are used, and the machine is divided into four sections and driven from the centre of the shaft instead of from one end.
Holmes’ washer-scrubber is now made in two sections, as shown in Fig. 322,