NATURAL HISTORY BUILDING 99 



tanks, four with a capacity of about 750 pounds of ice each, and two 

 with a capacity of about 325 pounds each. Their location is near the 

 top of the freight elevators and of the elevators and stairway in the 

 north pavilion, and in the attic space of the middle wing near the 

 south pavilion. The tanks are of steel covered with cork and wood, 

 and each contains a coil of 1^-inch galvanized iron pipe for the circu- 

 lation of the water, on top of which the ice is placed. Water enters 

 the coils from the city mains, and also by return after dropping to 

 the ground story, the circulation being continuous. The outlets, 

 aggregating 20 in number, terminate in spigots, set in small catch 

 basins with waste pipes, which are embedded in the walls except a 

 few in the third story which are set against the thin expanded metal 

 partitions. While this service is commendable in principle, its ad- 

 vantages are restricted by the fact that the water cannot be 

 carried far, especially in a horizontal direction, at a sufficiently low 

 temperature. 



Gas. — No provision has been made for the use of gas for illumina- 

 tion, but it has been introduced on a small scale to serve the few 

 purposes in which a flame is required for heating, as in the mechanical 

 shops and some of the laboratories. The main enters the building 

 under the north pavilion where, in the battery room, a meter is 

 installed. The distribution is through the tunnels under the ground 

 floor and the pier chases. 



WATER CONNECTIONS AND SEWERAGE 



Water is brought into the building under the south doorway of the 

 east entrance through a 6-inch pipe leading from a 12-inch city main. 

 The 6-inch pipe enters and terminates in the boiler room, but before 

 reaching there it is tapped by a 4-inch pipe from which nearly the 

 entire building is served for general purposes. This principal branch 

 diminishes in size as connections are made for supplying the toilets, 

 basins, sinks, fire risers, etc., until it reaches a minimum of 2 inches 

 in the extreme west side of the ground story and in the third story. 

 The distribution of the pipes, which are of galvanized steel, is 

 through the tunnels and pier chases. With the exception of the fire 

 service, the city pressure is relied upon, although the service in the 

 third story is cross-connected with the power plant to provide against 

 an emergency. 



Hot water connections with the lavatories, wash basins and slop 

 sinks are made from the engine room. The machinery comprises a 

 2-inch Alberger volute pump run by a 1 horse power Westinghouse 

 motor, from which a l|-inch discharge passes through an Alberger 

 hot water heater made up of copper tubes in a manner similar to the 

 large heaters. From the heater the water is carried to a large tank 



