Fig. 67. - White Earthenware Wash-trays.

Wash-trays are made of white earthenware, iron (plain, galvanized or enameled), soapstone, slate, cement or wood.

Fig. 67 represents a set of three white earthenware trays. They are undoubtedly by far the most clean and durable of all kinds, but are correspondingly the most expensive. Wooden tubs are objectionable on account of their liability to shrink and crack and ultimately to decay. They can only be recommended in places where their use is constant, as in some classes of hotels. Of the cheaper kind of trays we should prefer slate or soapstone. Fig. 68 represents the

Fig. 68. - Plan of Wash-trays. From Gerhard's "Domestic Sanitary

Appliances." construction of wash-trays as recommended by Mr. Gerhard in his "Domestic Sanitary Appliances." In place of the chain and plug he suggests the use of a stand-pipe overflow, "thus avoiding not only the danger of an accidental overflow, but also, what is more important, the common nuisance of soap slime and particles of filth from soiled linen adhering to the countless links of the chain."