59 



Cover the top with empty paper cement sacks, build- 

 ing paper or any other handy material. 

 HOT WEATHER. 



Concrete, to he of good quality, must set slowly and 

 with plenty of moisture present^ Rapid drying does 

 not provide sufficient water for proper crystallization 

 and to insure the safety of concrete installed in the hot 

 seasons it becomes of vital importance to protect the 

 fresh concrete from the effect of the direct heat rays 

 in every practicable way. Both forms and concrete 

 should be kept soaked with water and the placings 

 should be shaded with awnings; and if this is not pos- 

 sible the surface covered, as soon as placed, with cloths 

 which should be kept soaked with wnter and the place 

 where operation ceased at any time during the day or 

 at the end of the day's work covered with rags. During 

 the night a man should be kept on the job expressly 

 for the purpose of keeping everything thoroughly 

 wotted. 



Concrete should he flushed thoroueMy at nierht and 

 earlv morninp. for nt least a week after placing, and 

 left to drv off naturally during the day. no water being 

 applied while the ravs of the <=nn are pourinq- upon it. 

 for the veneration of steam will be <?ure to disirr 

 the surface. 



FTET,D NOTES. 



Acid Fumes. The fumes from and or a <=nilt or 

 broken bottle of arid will ruin clotbW and rone* and 

 tools. Tt is be^t to keep acid out of the locker and in 

 a <=afe place. 



Blue Prints. Tt is a pood plan to entrr on the re- 

 verce of the bluf print the date and from whom re- 

 ceived. This wHl prevent a substitution without the 

 sunerintrnci' rt's krowlerW of bine nrint. covering 

 cbanees in the work. 



Borrowing Tools. Discourage as much as possible 

 the habit of borrowing tools among fellow mechanics. 



