174 CEMENT AND CONCRETE 



153. Vault for Privy (Fig. 164). 



Requirements: To construct a sanitary vault for privy with 

 partition as illustrated in plan. As many sections can 

 be made as desired. This is a dry type of vault, dry 

 earth or ashes being used to absorb liquids. 



Instructions: 



1) Prepare footing for vault so its lower level will be no 

 lower than the surface of the ground. 



2) Construct form in place. 



3) Provide pieces of wire for reinforcing to insure against 

 shrinkage cracks. 



4) Mix concrete of 1 : 2 : 3 proportion to a wet consist- 

 ency. 



5) Place floor and wall of vault as one unit. 



6) Remove inner form after twenty-four to forty-eight 

 hours, and paint up any holes with 1 : 2 cement-sand 

 mortar. 



7) Paint inner surface with a cement wash. 



8) Remove outer form after several days. 



9) Finish outer surface. 



154. Milk-Cooling Tank (Fig. 165). 

 Requirements: To excavate, construct form and place con- 

 crete and reinforcing for a milk-cooling tank to be 2' 6" 

 wide, 20" deep, length as needed, bottom 8" lower 

 than floor of milk room. The bottom to be corru- 

 gated to allow free circulation of water with drainage 

 outlet. 



Note: Refer to Sec. 143. 



