This section is from the book "Principles And Practice Of Plumbing", by John Joseph Cosgrove. Also available from Amazon: Principles and Practice of Plumbing.
Laundry Trays, Fig. 157, are used to wash clothes in. There are three tubs in a full set, and when properly installed they are supplied with hot and cold water and are connected by a waste pipe to the drainage system. When laundry trays are located on any floor above the basement, they should each be provided with an overflow pipe to prevent water overflowing and damaging the ceilings below. When located in a kitchen they should be provided with covers to conceal soiled clothes when soaking, and to provide table space on top of the tubs. In large apartment houses a general laundry is sometimes fitted up in the basement; when such is the case a single tub should also be installed in each of the apartments for the tenant to do light washing in.

Fig. 157

Fig. 158
 
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