This section is from the book "Principles And Practice Of Plumbing", by John Joseph Cosgrove. Also available from Amazon: Principles and Practice of Plumbing.
Pantry sinks are made of copper and of porcelain. They are used chiefly in cleaning silverware, cut glass and china, also for drawing water for table use. Copper sinks are made in oval and square patterns and are set in a frame work of wood and furnished with a wooden top. Sometimes copper sinks are set in a box containing soft plaster paris, so that when the plaster hardens the sink will have a solid bearing to prevent the copper becoming easily dented. Oval pantry sinks are pressed out of one piece of sheet copper and have a waste pipe and overflow tube soldered on. Square pantry sinks are made of two or more pieces of sheet copper locked and soldered together. Like the oval pattern, square sinks have waste pipes and overflow tubes soldered on.
Copper pantry sinks are quite extensively used at the present time owing to their apparent cheapness. They are slightly objectionable, however, on account of the large amount of woodwork required to encase them; the filthy joint that is left between the flange of the sink and wooden top; and the poor waste and overflow connections that generally are made with a putty joint.
Porcelain Pantry Sinks are more sanitary and are better appearing than copper sinks. They are sometimes objected to on the ground that they are more destructive than copper sinks to china or glassware accidentally dropped in the sink. This objection can now be overcome by using a rubber mat or a wooden grating on the bottom of the sink.
 
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