Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

533 OF engineering fokmulæ Breast and Overshot Wheels—continued. FORMS OF BUCKETS. D - Depth of shrouding. cl — Distance of buckets apart on periphery. I = Length of wrist mea- sured on periphery. S = Length of start (radial). ....... Two-part Buckets. D = d. S = J D. I = 1| D in large wheels. I = D in wheels under 25 feet diameter. Three-part Buckets. Divide D into 3 equal parts. a = Length, of arm measured on periphery D = d. 8 = i D, a = J D. Z *= D in large wheels. I = I D in wheels under 25 feet diameter. ’S? GUDGEONS OF WATER-WHEELS. w — Weight on the gudgeon in cwts. D — Diameter of gudgeon-journal in inches. D = ^/ ■ 86 W for wrought iron. D = VW for cast iron.