28o PHILIP DAWSON 



engines should always be employed. The wear on the cylinder 

 is reduced, as also the quantity of oil required, and with an 

 automatic oiling system and a well laid out station the super- 

 vision of such engines will not be greater than would be the 

 case with horizontal ones. America now possesses a large 

 number of stations in which vertical engines are running. No 

 better example of such a station can probably be found than 

 the 96th street station of the Metropolitan street railway of 

 New York. 



The boiler house of this station contains three tiers of 

 boilers, and above them, two large coal pockets or bins, each 

 having a capacity of 5,000 tons. From these the coal is 

 led to the boiler furnaces by chutes. The boilers are fired 

 by mechanical stokers of the Vickars type for the most part, 

 but there are some box stokers and some boilers are hand 

 fired. The boiler equipment consists of eighty seven Bab- 

 cock & Wilcox boilers arranged, as mentioned above, in 

 three tiers. These boilers have a heating surface of 2,665 

 square feet each; the drums 42 inches in diameter and 23 feet 

 4 inches long. The gases from the boilers are led to a large 

 smokestack made of brick, and measuring 353 feet in height 

 and 22 feet internal diameter throughout. The condensing 

 plant consists of Worthington surface condensers and in- 

 dependent combined air and circulating pumps, each engine 

 having its own condenser. 



There are eleven engines, made by the Allis-Chalmers Co., 

 of Milwaukee, each direct coupled to one generator. These 

 engines are of the vertical cross compound condensing type, 

 with the generator mounted on the shaft between the cyhn- 

 ders. Normally the engines give 4,500 indicated horse- 

 power when running at 75 revolutions per minute, with steam 

 at 160 pounds per square inch; but they are capable of running 

 continuously at 6,000 indicated horsepower or for short 

 periods at 7,000 indicated horsepower. The cylinders 

 measure 46 inches and 86 inches in diameter by 60 inches 

 stroke. The shaft measures 34 inches at the journals, 30 

 inches at the cranks, and 37 inches where the generator and 

 fly wheel come; it is 27 feet 4 inches long, and has a 16 inch 

 diameter hole through its length. The connecting rods are 



