which are not apparent to the uninitiated observer, 

 which have to do with auxiliaries in the power plant. 

 The engine room may be said to be the heart of the 

 building, for the reason that the power plant supplies 

 the building with light and heat as well as power. 

 Tin- space allowed is necessarily small, while appa- 

 ratus for many different purj>oses are required. The 

 electric motor again proves its value here, being used 

 to drive pumps of different kinds as well as special 

 machinery incident to the operation of the building. 



It will be noted that the service required of electric 

 motors in the modern office building is exacting, and 

 they must be thoroughly reliable and well adapted to 

 the work they are to perform. They are frequently 

 called ujjon to run, fully loaded, continuously for 



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many hours, and failure would interfere seriously with 

 the successful operation of the building. 



The Diehl Manufacturing Com /HI in/ makes a 

 specialty of motors for the purposes outlined, and the 

 motors installed in the Singer Building arc note- 

 worthy for their efficient, sparkless running and low 

 heat limits. The motors an- strongly and compactly 

 built and all parts subject to wear have generous 

 allowance to insure great durability. 



The motors drive ventilating fans located in vari- 

 ous parts of the building, from the MIMh floor to 

 the engine room in the basement. They are also 

 used to drive pumps for ice-water circulation through 

 the building and for emptying the drain pit in the 

 basement into the sewer. The Vacuum Cleaner 



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