SPE C1FICA T20NS. 3O I 



The vertical supply pipe shall be further sustained by plate 

 steel collars, secured to. . .inch radial rods, attached to each tower 

 leg in its horizontal plane and at each panel-point. 



(When climatic conditions render boxing or frost-proofing 

 necessary, insert the following: About the vertical supply main 



a frost-case in diameter shall be provided. It shall 



consist of sections of inch plate, riveted to 



form a steel tube, with horizontal end flanges of , 



inch angles. In the plane of each set of horizontal tower struts 

 (except when a bottom tie strut is used) the pipe shall be braced 



by means of inch collars, secured to... inch horizontal 



radial rods extending to each tower post at its panel-point. The 

 frost-case shall extend the entire length of the vertical supply pipe 

 and shall rest upon the pier supporting the foot-bend.) 



The cast-iron pipe, foot-bend, expansion-joint (frost-case), and 

 ties shall be included in the cost of the water-tower. 



MATERIALS. 



All material intended to be used in the construction of this 

 water-tower shall be the product of some well-established and 

 reputable mill. 



All tank plates and principal parts shall be manufactured 

 by the open-hearth process and the reduction of the metalloids 

 shall be insisted upon to the following maximum percentages in 

 the finished product: 



Acid process: phosphorus 08% 



Basic' " " 04% 



Drillings for chemical analyses may be taken either from test 

 pieces or from the finished product. 



Plate steel shall have an ultimate strength of 60,000 Ibs. per 

 square inch, with allowable variation of 5000 pounds either way, 



