882 TABLE XVIII. CUBIC YARDS OF DIGGING IN DRAINS, ETC. 



EXAMPLES. 1. Required the solid content of digging in a drain 

 3 feeo 6 inches deep, 7 inches wide at bottom, 13 inches wide at 

 top, and 500 yards in length? 



To find the mean width, 7-|-13=r20-7-2=10 inches mean 

 width ; then find 3 feet 6 inches, the depth, on the top of a page, 

 and opposite 500 yards, under 10 inches, the mean width, stands 

 1G2 yards 1 foot, the solid content. 



2. Required the solid content of digging in a drain 225 yards 

 in length, 6 feet deep, and top and bottom widths 2 feet 6 inches 

 and 1 foot 6 inches ? 



First, 21 feet + 1 J foot = 4. ~- 2 = 2 feet, mean width. 

 Then find 6 feet, the depth, on the top of 



the page, and opposite 200 yards in length, Yards. Feet. 



under 2 feet mean width, stands . . 266 18 

 And opposite 25 yards stands ... 33 9 



Solid content, 300 



3. Required the solid content of digging in a drain 3 feet 10 

 inches deep, width at top and bottom 14 and 8 inches, and 1000 

 yards long ? 



14 + 8 = 22 ~ 2 = 11 inches mean width; then, as 3 feet 

 | 10 inches, the depth, is not found in the Table, take the two 

 depths, of 3 feet, and 10 inches, separately. 

 Thus, at a depth of 3 feet, opposite 1000 

 yards, under the mean width 11 inches, Yards. Feet. 



stands 305 15 



And at a depth of 10 inches, opposite 1000 

 yards, under width 11 inches, stands . 84 24 



The solid content, 390 12 



4. Required the solid content of digging in a ditch 700 yards ! 

 in length, 5 feet deep, width at bottom 2 feet, and at top 12 feet? j 



24-12=14 2 = 7 feet mean width; but as 7 feet, the j 

 mean width, is not in the Table, we may take the width as the 

 depth, and the depth as the width ; ami the lengths of 200 and 

 i 500 yards = 700. 



Thus, at a depth of 7 feet, opposite 200 yards, Yards. Feet, 

 under 5 feet wide, stands . . . 777 

 And opposite 500 yards stands . . 1944 12 



The solid content, 2722 -6 



