Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

532 Molesworth’s focket-book Breast and Ovebshot Wheels—continued. VELOCITY OF PERIPHERY. V = Velocity of periphery in feet per second. h = Fall of water in feet. When h = 5 feet V = 7 feet per second. = 10 =6-6 ^15 =6-2 = 20 =5-8 - 25 =5-4 = 30 -5-0 = 35 ^46 - 40 =4'2 = 45 ~3'8 = 50 =8-4 DISTANCES OF BUCKETS AI’ABT. 12 inches in high-breast or overshot. 18 inches in low-breast. OPENINGS OF BUCKETS. • I of a square foot to each cube foot of contents of bucket in high-breast. - i of a square foot to each cube foot of contents of bucket in low-breast. Or generally about 6 to 8 inches width of open- ing in high-breast. And about 9 to 12 inches width of opening in low-breast. Depth of shrouding from 12 in. in high-breast. „ „ „ 16 in. in low-breast. APPROXIMATE BULE SOMETIMES USED FOR THE NUMBER OF BUCKETS. D — Diameter of wheel in feet. N = Number of buckets. For wheels from 12 to 25 ft. diam., N = D X 2’1 „ „ 25 „40 „ N=I)x2-3 „ „ 40 „50 „ N - D X 2’4