78 
and distributing it over the building. In the shops the distribution is 
through sheet metal pipes that are suspended against the upper portion 
of the side wails. The temperature is controlled by a regulating device in 
the heating chamber. By this scheme the ventilating apparatus can be 
closed to any portion of the building not in use. It may be used also as a 
supplementary heating system in severe winter weather. 
POWER. 
The electric current used for power and lighting is generated in a plant 
that is about three hundred yards away from the nearest point in the shops. 
It is of the alternating kind and is brought to the building at a tension of 
twenty-two hundred volts and is then stepped down to two hundred 
twenty volts in a transformer that is placed just ontside of, and in the 
rear of the shops. The portion used for power purposes is carried to a 
number of small motors that run groups cf the machines or that run indi- 
vidual machines: there are seventeen groups in all besides the individually 
driven machines. 
In the wood working shop it has been possible to place the motors in 
the basement, and this is especially desirable in wood working, as it tends 
to freedom from dust. This was not possible in the machine shop, because 
of the design of the driving heads of ordinary machine tools. 
The general arrangement of the building is shown in Fig. 2, where the 
floor area devoted to the various purposes is shown, also. 
Adjacent to every one of the shops there is a room for demonstration 
purposes. This is arranged so (that a machine may be conveyed from its 
place on the shop floor and used during the exposition of its purposes. 
Power for this purpose is brought to these class rooms; and to furnish 
current for the projection lantern in the large iecture room, there is a 
separate set of wires from the power house, bringing a direct low tension 
current. This low tension current is carried at one hundred ten volts. 
CONVENIENCES. 
The basement under the main corridor has the locker and toilet rooms ; 
a battery of forty wash basins supplied with hot and cold water, and rows 
of metal lockers are arranged at each end. There are individual lockers 
for eight hundred fifty students, in which they keep their work clothes. 
In the shops there are also separate tockers for cight hundred fifty stu- 
dents, in which the material on which they are working is placed when 
not in use. 
