. The Street railway journal . gine andtwo generators being regarded as a unit, however. Incharging the batteries three circuits are employed, as abovedescribed, so that one generator may be run at 160, the sec-ond at 170 and the third at 180 volts. When only two gen-erators are run the voltage is 166 and 178. During thetime of light loads but one engine is run, but for heavytraffic both are employed. These engines were made by the M. C. Bullock Manu-facturing Company, of Chicago, and are of the same typethat this firm had running on exhibition at the WorldsFair in 1893. They have been in cons
. The Street railway journal . gine andtwo generators being regarded as a unit, however. Incharging the batteries three circuits are employed, as abovedescribed, so that one generator may be run at 160, the sec-ond at 170 and the third at 180 volts. When only two gen-erators are run the voltage is 166 and 178. During thetime of light loads but one engine is run, but for heavytraffic both are employed. These engines were made by the M. C. Bullock Manu-facturing Company, of Chicago, and are of the same typethat this firm had running on exhibition at the WorldsFair in 1893. They have been in constant service in thisstorage battery plant since it was installed in 1896, and arestill working without any apparent depreciation. Eachengine, as illustrated, is really a double vertical engine, andeach half consists of three tandem cylinders, or is a tandemtriple expansion single action engine, with central simplevalve gear, with a fourth cylinder at the base, which acts asan air cushion. An important and particular feature of. HARVEY SUB-STATION this type of engine is the drainage arrangement, which isaccomplished by having the pistons dished downward inthe center, while the hollow piston rod has a ring of portsflush with the surface of the piston, being in the best pos-sible place for drainage. This feature is claimed to makea saving of at least 15 per cent in the steam consumption,as there is no water left in the cylinder to rob the incoming September, 1899.] STREET RAILWAY JOURNAL. 56i steam of its heat during the period of admission. Para-doxical as it may seem, the piston speed, 500 ft. per minute,owing to the short stroke, only 8 ins., is slower than in so-called slow running engine. In these engines the diameterof the three cylinders is as follows: Low pressure, 23I ins.;intermediate, 14 15-16 ins.; high pressure, io{- ins. Theengines run entirely noiseless, and the governing featuresare unusually sensitive and efficient. Among the claimsfor this type of machine are dur
Size: 1417px × 1762px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
