252 



ART OF BUILDING. 



of arithmetic. For a stone building it must be done in 

 detail, by finding the number of stones of eacli dimen- 

 sion and finish, which will be required. 



For brick work it is different ; we have only to find the 

 superficial contents of the building, and then by estima- 

 ting 4500 bricks to each square rod, when the wall is 1^ 

 bricks thick, we have the total number required ; this is 

 the number with a proper allowance for waste, &c. To 

 facilitate these calculations, the following table is here 

 introduced. 



