PROJECTS IN CONCRETE CONSTRUCTION 



155 



the form has been removed . Forty-eight hours should 

 elapse for the ordinary job to allow for setting. To 

 finish the risers and sides of steps, remove all marks 

 made by forms by the use of a stiff brush. If care has 

 been observed in working the coarse material back 

 from the form and no air pockets have been formed, 



FIG. 150. Section thru hot-bed. 



this method of finishing is sufficient. If the wall is left 

 quite rough on removal of the forms, they should be 

 wet down and a cement mortar of the same propor- 

 tions as used on the treads should be applied with a 

 brush. Keep the step moistened for a week or ten 

 days until ready for use. 



143. Hot-bed, Foundation Wall, or a Similar Type of 

 Construction (Figs. 150, 151, 152). 



Requirements: To build a form such as needed for the walls 

 of a hot-bed or the foundation for a small building. 

 Determine the quantity of material required. Prepare 

 and place the concrete, remove the form in due time, 

 and finish the job. A mixture of wet consistency 

 should be used. 



Tools Needed: Same as in Sees. 140 and 141. 



Materials Needed: Enough cement, sand and gravel or 



