144 CEMENT AND CONCRETE 



top and 8" thick at the bottom, the bottom of tank 

 to be 5" thick. 



2) To make a rectangular tank with the same capacity 

 as No. 1, to have same thickness, walls and bottom, 

 and to be 4' 0" across inside at the top. 



3) To make a sidewalk 40 ' long, 3' wide, and 4" thick. 



mm M 



f/ 



FIG. 147. Making block. 



4) To make six concrete fence posts. Assume 20 cents 

 a post for steel. 



140. Molded Concrete (Figs. 147 and 147-a). 

 Project No. 2 



Requirements: To make tile of different sizes, block, flower 

 boxes, and other pieces of concrete work requiring a 

 dry mixture. 



Tools Needed: Shovels, bucket, measuring box, screen, mix- 

 ing platform, trowels, and suitable molds. 



Material Needed: Cement, sand and water. 



Preliminary Instructions: The principles outlined in the dis- 

 cussion on selection of sand must be kept in mind. 

 Only the best sand should be used. In the kind of 

 work outlined in this project, a relatively dry mixture 

 must be used, one about as wet as damp earth when 



