lavatories and private toilets. These eight risers are 

 collected into a 3-inch return, which is carried back 

 to the heater in the basement, a drop of about 550 

 feet, to insure good circulation. Branches are taken 

 off this pipe to supply the public toilets on the 35th 

 to the 14th floors inclusive. 



The hot water heaters are supplied with live and 

 exhaust steam, and controlled by Davis and Roesch 

 regulators. 



There is a high pressure ice water system for the 

 Tower. It is supplied from the 39th-floor tank, and 

 filtered a second time by being passed through a 



[59] 



