138 



SCIENCE. 



[N. S. Vol. XVII. No. 421. 



sliafts. A door, opens into each shaft on 

 each floor, making everything accessible 

 without the main pipes and wires being 

 exposed in the laboratories. On each floor 

 branches are brought out from the water 

 pipes to the sinks, from the air and gas 

 pipes to work tables, and from the dis- 

 tributing wires in the shaft to a small 

 switchboard, there being one such switch- 



connected to any other circuit in any other 

 laboratory room or to any battery or gen- 

 erator in the mechanical building. The 

 storage battery in the basement will be so 

 connected to the main switchboard that 

 any number of cells from one to the total 

 number may be joined to any laboratory 

 circuit, and an auto-transformer will sim- 

 ilarly give any alternating voltage re- 



E;>n3. riiOOE plan. 



3i-d FLOOR PL,AJ1. 



board for each suite of two or three rooms 

 in each quarter of the building. The 

 wires connected to these small switchboards 

 run to a main switchboard near the north 

 door of the first floor, and thence trunk 

 lines run through the tunnel to the dis- 

 tributing switchboard of the dynamic 

 room. Thus, through these two main 

 switchboards and a laboratory board any 

 circuit in any laboratory room may be 



quired. Alternating currents of different 

 phases and frequencies may be had at any 

 place by connecting to the proper machine 

 in the dynamo room. An experimenter 

 can then be supplied with any particular 

 kind of electric current by telephoning to 

 the engineer. The pipes and wires are 

 carried to the foot of these vertical shafts 

 through the basement and tunnels which 

 extend under the flues of the partitions 



