=The refrigerator.=——A good refrigerator is built with double walls, and has several layers of non-conducting material. Figure 7 shows the careful way in which the refrigerator wall is made. 1. Porcelain enamel lining lock joint. 2. Inside wood lining. 3. Three-ply red rope water-proof paper. 4. Wool felt deafening paper. 5. Flaxlinum insulation. 6. Dead air space. 7. Flaxlinum insulation. 8. Wool felt deafening paper. 9. Three-ply red rope water-proof paper. 10. Outside wood case. The ice chamber is arranged to be easily filled, and has a connecting pipe for carrying off the water. If this is connected with the sewerage system of the house, make sure that it is properly trapped (Fig. 8). See “Shelter and Clothing,” page 51, for description of the S trap. The closets for the food should have an enamel or tiled lining. This is non-absorptive, and may be kept perfectly clean. A large refrigerator is more economical of ice than a small one, and in the end more than balances the few dollars extra that must be paid for the larger size. Select the coolest spot that you have for the refrigerator. Figure 9 shows the construction of a good refrigerator. [Illustration: FIG. 8.——A refrigerator trap. _Courtesy of the White Enamel Refrigerator Co._] [Illustration: FIG. 9.——A well-constructed refrigerator. _Courtesy of the White Enamel Refrigerator Co._] Artificial ice is cleaner and therefore safer to use than the natural. Always wash off the block before putting it into the ice chamber. Wash out the ice chamber once a week, and pour a solution of washing soda down the waste pipe. The food chambers should be washed out once a week and dried, and no spilled food allowed to remain a moment. Do not leave the doors open. Have a strong ice pick for breaking ice. A _window box_ fastened outside the window by strong iron brackets provides a convenient place for cooling food, and keeping some semi-perishable foods. It is easily made from a watertight wooden box, painted outside and in, the opening toward the window having a curtain of table oilcloth. A piece of wire netting set in one side of the box permits of a current of air. [Illustration: FIG. 10.——A sink of simple construction. _Courtesy of J. L. Mott Co._] =The sink.=——White enameled iron and porcelain are the most desirable materials for the sink. A simply constructed sink is shown in Fig. 10. Notice that the sink is supported from the wall, leaving a free space underneath. A larger sink is shown in Fig. 11, with the draining board in the sink. The trap below the sink should be a large S trap, and the trap and faucets should be nickel plate. [Illustration: FIG. 11.——A larger sink. _Courtesy of the J. L. Mott Co._] An iron sink should be rubbed and polished until it becomes very smooth. Do not attempt to paint it. If it is left perfectly dry, it will not rust.