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Fig. 269, is usually fixed at the be fitted trim lower end of the waste-pipe, and chain to a knob. By a simple actuated by a weighted lever attached by a of slots in the socket of the arrangement waste- and knob, on bosses is tin- spindle of the knob, the latter can be fixed in positio with the waste-valve open, so that it need not be held the time the basin all up is being emptied. The fixed waste-plug is only suitable for places where valves priate, would be inappro- and where anything in the shape of a loose plug and chain would be be stolen.

266, the effect of which is that t trap Incomes a sort of permanent reservoir of soapy water. lc frequently of the most objectionable nature. of the lwusin,from the bottom of which a hole A sinking is made on each perforated through the marble or porcelain, and the outlet connected by a is pipe to the waste-pipe or trap. The draining pipes to these sinkings speedily become choked, and in course of time very foul with decomposing soap. The materials of which lavatory basins are generally made are porcelain, glazed or and enamelled iron stoneware, fireclay ; they can of course be made of tinned c opper and of galvanized iron, but neither of these % materials difference is in common use.

Work. hospital It is, is of great strength; it glazed fire-clay, white inside and tinted outside, and is which built into the wall. requires no other support than the projecting piece The overflow and waste are separate, the back of the basin being recessed to and waste are joined into are drained by means of small channels receive the overflow; under the basin the overflow one The sinkings pipe. , rim of the basin. Fig. 268 shows a good form of porcelain lavatory basin, which can be fixed either with or without a wood casing.