Laboratories, their planning and fittings . chkmistry 2J the dimensions are external or internal. As a general guide to sizes, 24 12 ins. by 7 ins. deep inside is suitable for a sink at a bench end, and forsinks in the bench covered as described, perhaps J2 ins. by i 5 to iS ins. by7 ins. deep. The usual outlet to a ware laboratory sink is a stoneware grid(no brass must be used) cemented in from the t(jp. Spigots (outlet pieces)made as part of the sink are better, as having no joint, which always getsdirty, but are so easily broken in transit that they are difficult to obtain frommakers
Laboratories, their planning and fittings . chkmistry 2J the dimensions are external or internal. As a general guide to sizes, 24 12 ins. by 7 ins. deep inside is suitable for a sink at a bench end, and forsinks in the bench covered as described, perhaps J2 ins. by i 5 to iS ins. by7 ins. deep. The usual outlet to a ware laboratory sink is a stoneware grid(no brass must be used) cemented in from the t(jp. Spigots (outlet pieces)made as part of the sink are better, as having no joint, which always getsdirty, but are so easily broken in transit that they are difficult to obtain frommakers. Spigots can also be cemented in from below (Fig. 9) and are satis-factory if not made to carry the weight of lead wastes. All grids in wasteopenings are apt to get choked at times and are best made movable but nottoo easily so, otherwise students may remove them and solid bodies mayfind their way into the drains. A perforated, slightly-tapered glazed ware plug(Fig. 10), the top flush with the bottom of the sink, will prove Fig. 10. Sink Outlets. The waste pipes should be straight lengths of untrapped lead or earthenwarepipe, the former dressed well over the sink spigot, suitably supported on thebench framing, and terminated with an open end bent slightly in the directionof flow in the drain. Bottle Racks.—Some reagent bottles are usually required on a bench,but if only one row is necessary, these can stand on a strip of opal glass letinto the bench top or surrounded by a thin hard wood beading. If tworows—usually the limit—are required a shelf generally of ^ in. plate glasssupported by wooden or metal ends, but sometimes of wood, or wood coveredby glass or tiles, is provided. These shelves, which serve both sides of adouble bench, are divided by a horizontal bar of wood, or enamelled iron, toprevent bottles being pushed through. Sometimes the whole of the framework is enamelled iron, which has a lighter effect than wood. Such ironreagent shelves are used
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1921
