. ANCIENT AND MODERN WORKS. 2Q 



constructed of steel, was badly damaged by the wind with a 

 recorded velocity of from 33 to 60 miles an hour, with an average 

 for five minutes of 57 miles. The pipe was located upon a hill, 

 and the wind had full sweep against it from every side. The 

 stand-pipe was erected upon a concrete foundation of ample 

 strength, and upon which it was observed to rock back and 

 forth during the storm, breaking two anchor rods on the south 

 side, showing a crystalline fracture. All of the rods were found 

 with their nuts off of their heavy batter washers. 



The specifications called for the following thickness and 

 weights of plate. 



Section, ft. from bottom. Thickness, in. Weight per sq. ft., Ibs. 



Bottom plate 1/2 20.0 



i to 5ft 3/4 30.0 



6 " 10 " 11/16 28.0 



21 " 30 " 5/8 25.0 



31" 4o" 9/ 10 22.5 



41" 45" 7/ 16 17-5 



46" 55" 3/ 8 !5- 



56" 65" 5/16 12.5 



66" 80" 1/4 10. o 



81 " 100 " 3/16 7.5 



The other chief features of the specifications were: T. S., 

 60,000 Ibs. per square inch. Vertical seams, D. R., and horizontal 

 seams, S. R. Bottom united to shell by 6 in.X6 in. steel angle; 

 top stiffening ring to be 3iX3j steel angle securely riveted to 

 plate. Eight anchor- rods, if inches diameter, securely anchored 

 in concrete foundations and passing through heavy lugs riveted 

 to shell. Plates to be such size that eight plates make a course 

 of 25 feet diameter and twenty courses a height of 100 feet. 



The angle stiffening ring was broken in several places. This 

 ring was in sections riveted on the outside of the shell. The 

 joints were butt-joints held by flat plates. The exact amount 

 of water in the tank during the storm's greatest intensity was 



