BLOW-OPT COOL—. A plug-cock at the bottom of the fire box, by the opening of which the boiler is blown of or emptied.
The pipe in the smoke-box connected with the blower-cock in the cab. By blowing steam through it, • draft is produced when the locomotive is at rest.
Bonze.— The large sheet-iron cylindrical structure, con stituting the main upper body of a locomotive, filled with tubes, in which the steam used for driving the locomotive and operating ,its various auxiliary appliances is generated.
Bon.sa-jaatisr.— See Jacket.
The wirg cap or netting placed over the smoke stack to restrain Ike sparks and cinders.
Dom— The bearings which rest upon the journals of the axles.
Basics.— The appliance by which a locomotive or a train is brought quickly to a standstill. Ordinarily, it consists of a flexible piece of strap-iron lined with wooden blocking which is applied to the tires of the wheels by means of rods and levers actuated by the pressure of compressed-air, or by hand.
The pipe through which compressed-air is conducted from the various air-reservoirs connected with the air-pump, to the brake-cylinders of the loco motive, the tender, and the cars composing the train. Each car has its own brake-pipe and brake-cylinder. When the cars are made up into a train, these pipes are connected with each other and with those of the tender and the locomotive, by means of flexible hose, and when thus connected, it is called the train-pipe. BaAsses.—The brass boxes on the croes-heads and the crank-pins.
Summit Swum— Pieces of timber bolted to the bumpers for the purpose of reducing the shock of impact when the cars come together.