40 



in temporary ([uartors ;ii:(l tin- iieriiuinent l)uilding was in progress of construction. 

 No work prescril)fd in thu catalogue lias been omitted from the course of uny 

 student. 



The acconip:inyin,<; plan shows the laljoratory as it now stands restored. Tlie 

 portion which was hiirned included the forge room, machine room and engineer- 

 ing laboratory; also, a three-story front containing ofhces, recitation rooms and 

 drawing rooms. The outline of the old building has been preserved in the new, 

 but the construction of the front has not yet been undertaken. All laboratory 

 rooms have been entirely finished and equipped. A room has been added for ex- 

 perimental work with natural gas, and the locomotive testing plant has been pro- 

 vided for in a separate building. jS'ot only has the capacity of the structure been 

 increased, but the etpiipment also in every department has been improved. Time 

 will not permit an enumeration, but the lloor ])lan shows the location of apparatus 

 now in jjlace and in daily use. 



It will be seen that while other lines oi work have not been neglected, the 

 'L'i|uipment of the engineering laboratory is especially complete for work in steam 

 engineering. The several engines shown are mounted as separate plants. This 

 arrangement avoids any chance of interference among different groups of students 

 who may be working with different engines at the same time. The Buckeye, 

 Straight Line and Baldwin engines occupy the Hoor space, which before the tire 

 was taken by the plant now in the annex. The Baldwin consists of a pair of 9h 

 and 16x18 Vouclain Locomotive Engines fitted up for the purpose of experiment. 

 These engines are supplied with steam from the laboratory boilers and are run 

 under the load of a friction brake. 



The loeinnotive testing plant in the annex laboratory has been much im- 

 proved. The plant shows Purdue's locomotive, Schenectady, in place, but tlie 

 arrangement of the plant is such that any locomotive may be received and tested. 



The engineering laboratory contains thirty-six steam cylinders aggregating 

 over l,oOO horse power. 



Method of Determining Sewage Pollution of Rivers. By Chas. C. 

 Brown, C. E. 



[Abstract.] 



In 1888 I began work for the State Board of Health of New York on the 

 iuYestigation of the purity of water supplies drawn from rivers, with a detailed 

 inspection of the water-shed of the Croton River from which New York City 

 derives its supply. This was almost entirely an inspection of the actual sources 

 of pollution, though a study was made of the chemical side of the question. The 



