212 



TOWERS AND TANKS FOR WATER-WORK'S. 



Tension on the Joint between the Bottom and the Cylinder. 



When, as in the case under discussion (Fig. 48), the bottom is 

 a hemisphere, the stress along this joint is 



W 904,857 



, or - = 1200 Ibs. per linear inch. 



27rr 7^4. 



/ v/ 



For 5/i6-inch bottom plate, with f-inch rivets, having 70% 

 efficiency of joint, the strength of this connection is 



0.3125X60,000X70% 



, or 3491 ibs.; 



hence the plate assumed and rivets given are ample to resist 

 the stress along this joint. 



The hemispherical bottom may be composed of one circular 

 dished head of steel plate, say 96 inches in diameter and 5/16 





FIG. A. 



inch thick, with ten 5/i6-inch curved special plates, all f inch 

 double riveted along the vertical joints, or the segments may 

 be made of such size as may be structurally economical. The 



