LABORATORIES FOR GENERAL TEACHING 41 



remain in the old portion of the building at the main entrance. 

 The large stock room and the ventilation equipment are in the 

 old part. There are five entire floors available for laboratory 

 purposes in the new addition. 



THE GROUND FLOOR 



The ground floor is divided between the department of indus- 

 trial chemistry and the State Water Survey. The south side is 

 occupied by industrial chemistry. The metallurgraphic labora- 

 tory is supplied with solid piers giving a firm support for the 

 microscopes, which permits high magnification. The assay 

 laboratory has eight furnaces, burning oil, gas, and coal. The 

 oil is stored outside the building and forced in by compressed air 

 through a constant pressure tank ; this arrangement prevents 

 fluctuation of temperature. There are also grinding and sample 

 rooms, a laboratory for wet assay, and a thoroughly equipped 

 dark room. 



The State Water Survey has the north end of the ground floor. 

 Besides the offices and routine laboratories there are rooms de- 

 voted to research, mineral analysis, sanitary analysis, and 

 bacterial examination. Glass partitions make these rooms 

 especially attractive. There are also two incubator rooms, one 

 for 20 and the other for 37J. 



THE FIRST FLOOR 



The division of physical chemistry occupies the entire north 

 end of the building, both in the new and old parts. The equip- 

 ment includes the following : a constant temperature room, 

 insulated with rubber ; a titration laboratory with white tile 

 finish ; a conductivity laboratory with a sound-proof booth ; x 

 a polariscope room ; a room for ultra-microscopic work ; an 

 optical room ; and a precision calorimeter room. There are in 

 use a 10-kw. 12- volt motor generator set and a 30-kw. trans- 

 former with variable voltage for electric furnace work. 



The south half of the first floor is occupied by the division of 

 industrial chemistry. There is an insulated room for calori- 

 metric work, where both gas and coal calorimeters are used, 

 Stirring is done by a central motor. A laboratory for advanced 

 pourses in gas and fuel analysis ; a laboratory for the analysis 



* Tin's is required in the use of the telephqpe. 



