. The Street railway journal . y to permitindependent expansion and contraction withoutplacing the cylinder casting under stress. Thetwo cylinders are united at the top by heavytie-rods, engaging peripheral bosses, and at the bottom by astout cast-iron distance piece. The rear section of the bed-plate which supports the two cylinders is cored hollow with acentral dividing wall, and serves as a reservoir for incomingand outgoing circulating water. All connections are pipeddirectly to these reservoirs, thus reducing the piping about theengine. Through the bed-plate extend the four vertical exhau
. The Street railway journal . y to permitindependent expansion and contraction withoutplacing the cylinder casting under stress. Thetwo cylinders are united at the top by heavytie-rods, engaging peripheral bosses, and at the bottom by astout cast-iron distance piece. The rear section of the bed-plate which supports the two cylinders is cored hollow with acentral dividing wall, and serves as a reservoir for incomingand outgoing circulating water. All connections are pipeddirectly to these reservoirs, thus reducing the piping about theengine. Through the bed-plate extend the four vertical exhaustpipes, which connect immediately below with an exhaust exhaust passages leading from the valve chambers arecast integral with the cylinders, upon their under sides, and arewater cooled. At the ends of each cylinder are horizontal side ports, re-sembling straight steam ports, which communicate with re-movable combustion chambers. The cylinders are closed bywater jacketed heads, those located between the two cylinders. (Copyright by the Westinghouse Machine Company.) FIG. 2.—DOUBLE-CRANK HORIZONTAL GAS ENGINE, 1500 HP varying in richness according to the load, the Westinghouse being split diametrically for facility in inspection of the in-terior, and the two halves united with a ground fit, no packingbeing necessary. This feature obviates the necessity for com-pletely dismantling the engine for inspection. The combustion chambers are independent castings, withplain machined faces, circular valve-liner seats and cored outpassages for circulating water. Both admission and exhaustvalves, which are of the standard poppet type, operate verticallyand with opposite throw. They open by cam movement, andare held to their seats by spring pressure. The central space,closed by the admission valve above and the exhaust valve 302 STREET RAILWAY JOURNAL. [Vol. XXL No. 8. below, communicate directly with the cylinder port beforementioned; the exhaust space with the exhaust passages
Size: 2629px × 951px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
