192 



POULTRY CULTURE 



and most substantial foundation and floor is made of concrete. 

 Figures 81 to 82 show views of the construction of the main 

 part and one wing of the new 180 feet unit system breeding- 

 house at the North Carohna Experiment Station. Figure 

 83, 4 shows the survey outfit and a means of finding the level. 

 When this is not available a line can be stretched and, by aid 

 of the level and straight edge, the level Kne can be obtained. 

 Figure 83, 7 shows the forms in which the concrete foundation 

 is made. This foundation is 4 inches wide and 1 foot above 

 the ground at the highest point. It extends into the ground 1 



Fig. 83. — Construction of the foundation and floor. 1, The cinders, 

 which are being leveled and tamped (2) after being wet down (3) ; 4 is the 

 survey outfit to find the level; 5, mixing the concrete; 7, the forms which 

 extend 1 foot into the ground and in which the 4-inch concrete wall is made; 

 8, the 3-inch coat of coarse concrete; 9, the bolts set into the concrete 

 to which the 4 by 4 inch sills are to be bolted. 



foot. The floor space inside the frames is filled in with cinders 

 of a good grade to within 4 inches of the top of the foundation 

 frames. These cinders are wet down and tamped (Fig. 83, 2, 

 3). Figure 83, 8 shows 3 inches of crushed rock and sand and 

 cement. The crushed rock and sand should constitute 7 

 parts and Portland cement 1 part. The gravel, sand, and 

 cement are mixed dry, then wet down and mixed again to the 

 proper consistency, loaded into wheelbarrows, wheeled to 

 the proper places, and tamped down. On top of this is placed 



