Research Buildings 



197 



current at 110 volts ; they have also from 1 to 4 special outlets for direct-current circuits from 

 the storage-battery room, and from 1 to 4 gas outlets. There are likewise on this floor 

 3 rooms for the use of observers and 1 small room for the caretaker of the building. The 

 detail of the window openings in the laboratory rooms is designed to provide light-proof 

 curtains for darkening the rooms for special experimental work. The only piers carried 

 to the first story are those in rooms Nos. 207 and 209; they are of course free from the floor. 

 Below the floor they are 3 by 3 feet to the concrete footing and \2h inches square from just 

 below the floor; the top sections are of hydraulic white brick surmounted by white marb e 

 caps 2 inches thick and 16 inches square placed 3 feet above the floor. These piers are so 

 aligned with windows and doors that from the one in room No. 209 it is possible to sight 

 thi-ough the building either on the northwest-southeast line or the northeast-southwest 

 line and from that in room No. 207, on the northeast-southwest line and to the northwest. 

 In order to give the greatest possible freedom in the experimental work, from 1 to 4 

 special three-foiu-ths-inch conduits with two 8-gage wires each are installed from the 



SC ALt IN r L t T 



SCALZ, IN Mr.TEKS 



Fig. 7. Plan of Second Floor of Main Building. 



switchboard to each room. Conduit connections are inserted in the walls between the rooms 

 to provide for clock and other circuits. As already stated, the distributing-switchboard for 

 the storage battery is so arranged that various combinations can be secured in any one of the 

 rooms independently of any other. Small special soapstone switchboards are provided in 

 eachroom at thespecial circuit outlet boxes to make possible additional combinations. Each 

 room is supplied with a heavj' oak hook rail just below the ceiling. This is intended for 

 the stretching of fine piano wire from side to side to support special overhead wiring and 

 appurtenances. In each room, 7 feet above the floor, a 4-inch wooden rail is securely fas- 

 tened to the walls for mounting light lead-wires and galvanometers ; vertical wooden strips, 28 

 inches long, are placed in some of the rooms and extend down from this rail; on these strips 

 may be mounted movable and adjustable shelves for the lighter apparatus. A 6-inch 

 molded table-rail at the height of 33 inches has been added throughout this floor. For 

 mounting the heavier instruments, or those requiring great stability of bearing, such as 

 balances, heavy cast-iron brackets are attached to the walls bj' expansion bolts and on 



