137 



THE RIGHT.ANGLE. 



Every Farmer ought to know before he erects a house or any other build* 

 ing, how to layoff the sills in an exact square. He must measure off 8 

 feet from the end of one sill, and there make a mark ; he then measures off 

 6 feel on the sill lying at right angles with the first, and makes another 

 mark ; he then lays on a 10 feet pole, one end of it squaring with the first 

 mark and if the other end of it does not exactly meet the second mark, 

 he moves the sill in or out, until it exactly squares with it. The figure 

 which he thus makes in marking off his sills and in laying down his 10 feet 

 pole, is a right-angled triangle, A, B, C ; the right-angle or square corner 

 being at B. 



Now, unless the line A C be 10 feet 

 long when the other two are 8 and 6 re- 

 spectively, the corner B will not be a square 

 corner; for it is found by mathematicians, 

 that in every right-angled triangle, the long, 

 est lina the line opposite to the right- 

 angle when squared, is just equal to the 

 squares of the other two, the lines A B 

 and B C. This is the reason why carpen 

 ters adopt this rule to lay their sills square 

 8 squared being 64, and 6 squared, 36; 

 both together being 100 ten squared being 

 100, ten times ten. 



8 feet sill. 



O 



MEASUREMENT OF CORN IN THE CRIB. 



After levelling the corn, multiply the length and breadth of the house 

 together, and the product by the depth, which will give the cubic feet of the 

 bulk of corn : then divide this last product by 12, and the quotient will be 

 the number of barrels of shelled corn contained in the house or crib. If 

 there be a remainder after the division, it will be so many twelfths of a 

 barrel of shelled corn over. 



Example. 

 32 feet long 

 11 feet broad 



~132 



6 feet deep 



12)792 cubic feet 



66 barrels of shelled corn 

 5 bushels in a barrel 



330 bushels of shelled corn. 



12* 



Memoranda. 21,500 cubic inches will 

 contain ten bushels of shelled corn, but 

 the same space filled with corn in the ear 

 will shell out rather more than five bush 

 els. These 21,500 cubic inches contain 

 12 cubic feet, and 764 cubic inches over. 

 Now, two barrels, or ten bushels in the 

 ear, will generally, in shelling, overrun 

 just about these 764 cubic inches. 



