AGRICULTURAL ENGINEERING. 



171 



RISE OF THE SLOPE FOR 100 FEET. (Waring.) 



Table I. gives the rise of the slope for loo feet of the horizontal 

 measurement. 

 Table II., the rise of the slope for loo feet of its own length. 



Deg. 



15 

 20 



25 

 30 



35 



40 



45 



Table No. I. 



Feet. 



119-175 

 142.815 

 173.205 

 214.451 

 274.748 



373-205 



567. 128 



1143.010 



Deg. 



15 

 20 



25 

 30 

 35 

 40 



45 



Table No. II. 



Feet. 



8.716 



17-365 



25.882 



34.202 



42.262 



50 



57 358 



64.279 



70 711 



Example. — If the horizontal measurement is 100 feet, and the slope is at 

 an angle of 10°, the rise will be 17.633 feet. 

 If the sloping line (at an angle of 15°) is 100 feet, it rises 25.882 feet. 



QU.VNTITY OF EARTH REMOVED PER ROD OF 

 DRAINS OF VARIOUS DI3IENSIONS. (Scott.) 



Q- 



2^ 



4 

 5 



In. 

 7 



Mean Width of Drains. 



Cubic Yards. 



In. 



18 



2.29 



2 75 

 3.21 

 3.66 

 4.58 



*' If a 4-ft. drain be cut 14 in. wide at top and 4 in. at bot- 

 tom, the mean width will be g in., and the quantity of earth 

 excavated in cutting each rod will be 1.83 cubic 3'ards ; if 



