GRATE A bar attached to the movable grate-bars of shaking or rocking grates, by which they are moved back and forth with a rocking motion, thus dis turbing the fire over the whole area of the grate, to effect proper combustion. It is operated by means of a suitable lever placed in the cab.
The parallel bars between which the cross heads move, thusgiving a perfectly horizontal motion to the piston-rods. They may consist of two parallel bars. double-guides or a single guide-bar, attached to the back bead of the cylinder and to a support called the guide yoke, a strong plate usually fastened to both the frame and the boiler. and placed across the frame at a point well forward of the front driving-wheels.
The blocks on the back-head of the cylinders, and on the guide-yoke, to which the guide-bars are attached.
aum•ffouiz.— Openings provided in the outside shell of the furnace near the ring, through which deposits of rust or dirt in the water-legs of the furnace are removed.
Brass or iron pipes attached by brackets or studs to the upper part of the boiler, and extending from the cab to the smoke-box. They are used by the engineer in getting on or off the running board.
A large light placed on the front end of the locomotive to illuminate the track in front and thus disclose any obstructions that may exist thereon, and to signal the approach of the locomotive.
Hirarita-cocks.— Cocks attached to the back end of the boiler, by which steam is blown through the feed-pipes, to prevent them from freezing in cold weather.
Hou.ow-zr•vs.— Hollow stay-bolts inserted through the inside and outside sheets of the furnace near the crown sheet, through which air is admitted to the furnace to increase the combustion.
Housz.— See Cab.
INDucnoz-roars.— The passages in the valve-seats, through which steam is admitted to the cylinders. See Steam-ports. Isurcroa.— A mechanical device by means of which a continuous supply of feed-water is given to the boiler. Partial condensation of the steam is essential to efficient action. The injector will not feed water too hot to condense the steam.
Jacsarr.— The outside coverings of the cylinders and the boiler. The boiler jacket is composed of layers of wood called " lagging " about seven-eighths of an inch in thickness, felt, and iron, placed around the boiler to prevent the lose of heat by raidation and convection.