950 EXPERIMENT STATION RECORD. 



tuiv of ii])out 75", regardless of the outside temperature. The tem- 

 pered air will be circulated In^ two fans and discharge into a large 

 pleiuun chamlK'r, from which tempered air passages will run to various 

 parts of the l)uilding. In the plenum chamber the tempered air will 

 be sprayed with moisture to give it the proper degree of humidit3\ 

 Supi)lementar3' heaters, located under each tier of rooms, will heat a 

 part of the air to 110°, and at the bottom of each pair of flues Avill be 

 mixing dampers for controlling the amount of hot air mixed with the 

 tempered air. These dampers will be actuated by thermostats located 

 in the rooms above, so that the heat of each room will be absolutely 

 under control and can be cut off independentl}' of an}- other room. 



Provision will be made for supplying each laboratory room with hot 

 and cold water, distilled water, gas, live steam, compressed air, and 

 suction, as well as with electricity for light and power. All pumps 

 and machinery for maintaining the supplies of these will be located 

 without the building in the power house. The equipment of the latter 

 will include a plant for generating the electrict}'^ used for various 

 purposes. 



At six points in each wing there will be pipe shafts which will con- 

 duct the risers from the supply pipes in the subbasement, the laterals 

 for each room being brought out horizontal 1}' and suspended from the 

 ceiling of the room below, whence they will be brought up through the 

 floor at the desired points. All piping will thus be exposed, and the 

 pipe shafts wall be provided with doors so that the risers will be easily 

 accessible. In each of the double partitions between the rooms and 

 next to the outside wall will be a lead-lined soil pipe to carry the 

 waste. 



The details of equipment for the various laboratories will be worked 

 out later, after the assignment of the space has been made. Work 

 tables, sinks, hoods, and other fittings will be installed to suit the 

 requirements of the different kinds of work, but in the construction of 

 the building there will be no special provisions for a chemical labora- 

 tor}', a soil laboratory, a botanical laboratory, and the like, such as 

 are usually made in buildings of this kind. The facilities provided 

 throughout the two wings will be so complete as to admit of adapting 

 the rooms to a great variety of purposes, and to allows changes or 

 extension of quarters to be made readily at any time in future. This 

 will avoid the tearing up of floors and special equipment, and wall be 

 a great advantage in an institution like the Department, whose work 

 is growing rapidl}^ and whose special needs are changing from time to 

 time. 



Each wing will have three elevators, one of which will probal)ly be 

 used for freight; and on each floor will be located three large toilets, 

 suitably- ventilated, and provided Avith open ])luni])ing and marble 

 flttings, together wath janitors' storerooms. 



