Simple Wastes

In the common sink-of all-work, the waste-outlet generally takes the form of a simple brass grate, the stone or fireclay having a rebated hole, as shown in fig. 28, to receive it. A cup of lead (a) with a flange or rim at the top, is bedded in red-lead cement, and the brass grate (b), with the edge previously tinned, is then soldered to the flange of the cup; sometimes the grate is secured by pouring molten lead around it instead of by soldering. The lower end of the cup is soldered to the inlet of the lead trap. At one time glazed fireclay grates and shanks were often used, but they are not as durable or as satisfactory in other respects as brass grates. The area of the openings in the grate ought to be at least equal to the area of the cross section of the trap and waste-pipe, so that these will be effectively cleansed by the flush of water.

Another method of fixing the grate is by means of a brass coupling with fly-nut (a), as shown in fig. 29. The brass tail-piece (6), after being tinned, can be soldered to the inlet of the lead trap by an ordinary wiped joint, or by a copper-bit joint. Fig. 30 is an improved form with enlarged grate; the dimensions are as follows: Diameter over flange 3 5/8 in., diameter over screw 2 1/4 in., bore of union tail 1 1/2 in.

Fig. 28. Common Sink-Waste with Brass Grate and Lead Cup.

Fig. 29. Sink-Waste with Brass Union and Fly Nut.

Fig. 30. Improved Sink- Waste withLarge Grate.

It is a good plan to place in every sink a small perforated metal strainer for the reception of garbage, such as tea-leaves and scraps of food, so that these do not choke the grate or the trap. A special compartment may be made for the purpose as shown in fig. 20. In a sink recently designed by Broad & Co. (fig. 31), a small tinned-copper strainer is placed below the outlet grate, a second grate being inserted below the strainer, so that large solids cannot pass into the trap even if the strainer is removed. The sink is made in four sizes, ranging from 24 in. by 18 in. by 6 1/2 in. to 48 in. by 24 in. by 9 in.

Fig. 31. Broad & Co.'s Sink-Waste with Strainer.

Fig. 32. Improved Plug-Waste.