FIGURE 2.—Sketch showing sanitary privy box with stack. (a) Galvanized pall, 15 inches high

and 15 inches in diameter; (b) blocks to hold pail in position; (c) bottom of box; (d) 1-inch holes, 1 inch from bottom, to be covered with screen wire; (e) opening to stack, to be cov ered with screen wire.

the back wall make an opening 4 inches square for the ventilation flue.

Let the ventilating flue measure at least 4 inches square, inside measurement. Make the short arm of the flue about 2 feet long, extend the long arm about 1 foot above the roof of the privy, and join it to the short arm at right angles. Attach the ventilating flue securely to the outside wall of the privy.

Tack small blocks of wood 2 inches thick to the bottom of the box to hold the can in its proper place.

Do not waste food; save it for those who need it.

FIGURE 3.-Sketch showing installation of sanitary box in existing privy building. a, Sceen-wire vent; b, galvanized iron pail, 15 by 15 inches in size.

Fasten a block of wood inside of the back wall of privy to prevent the lid of the seat hole reaching a perfectly vertical position, thus making it self-closing.

The can for use in the sanitary box should be constructed of galvanized iron of No. 22 to No. 26 gage, and should be 15 inches in diameter and 15 inches in height. Handles should be attached to the sides of the can.

FIGURE 4.-Sketch showing house and vault of sanitary privy.

Dimensions are approximate

and may be varied. (a) Screened vent over door.

A CONCRETE-VAULT SANITARY PRIVY.

Figures 4, 5, and 6 show a type of privy that is recommended by the UNITED STATES PUBLIC HEALTH SERVICE. This privy has a watertight concrete vault, and is fly-proof, well ventilated, and economical.

The concrete-vault privy has several desirable features:

1. It is permanent.

2. It requires less scavenger service.

3. It is less likely to need repairs.

4. It is especially useful in colder climates.

The concrete-vault privy is strongly recommended to companies or persons who wish lasting sanitary improvements.

FIGURE 5.-Plan and elevation of concrete vault privy. (a) Back wall of Louse; (b) vent, 4 inches square, inside house, screened at bottom; (c) No. 24 gage galvanized iron hinge; (d) concrete section in front of hole cut to 2 inches; (e) 2 by 4-inch timber extends 1 inch over walls; (f) 2 by 4-inch timber; (g) vent, 4 inches in diameter; (h) 3-inch anchor bolts, 8 inches long; (i) house floor; (j) door to vault, should be waterproof; (k) ground line; (1) inside surface of vault, finished watertight with neat cement; (m, m) seats, 12 by 18 inches. Dimensions are approximate and may be varied.

1. Study the designs carefully.

2. Dig the hole in the ground 5 inches larger than the outside dimensions of the vault.

3. Make suitable forms corresponding to the inside dimensions of the vault.

4. Pour the bottom of the vault and allow the concrete to "set.” 5. Place the forms accurately in the hole, leaving a 5-inch space on all sides.

6. Pour the walls, using barbed wire for reinforcing, and put in the anchor bolts.

7. When sufficiently dry, remove the forms and plaster the inside of the vault with rich concrete to make it positively water-tight.

8. Put on a new privy seat, flue, back lid, and covers over the seat holes, all to fit fly-tight.