PETTICOAT OR DRAFT The pipe through which the exhaust-steam is conducted to the exhaust-nozzles in the smoke-box, thus creating a partial vacuum in the smoke-box, which sucks the smoke and gases out of the flues with great power, and forces them out into the open air by the blast or the action of the exhaust steam.
See Cow-catcher.
The disc-like plunger in the cylinder which is moved with a reciprocating movement by the steam, converting the energy of the steam into motion.
Pwroz-zon.— The rod attached to the piston-head, and by means of which the motion of the piston-head is communicated to the connecting-rod or crank.
The valve by means of which the air in the water-space of the pump is expelled. and a partial vacuum produced so as to cause an inflow of water to start the action of the pump.
A slotted curved bar which holds the reverse lever in the proper position by means of a reverse-latch. Also, a toothed bar located in the cab, by means of which the variable exhaust is regulated.
The angle-bar attached to the back end of the truck frame and to the radius-bar cross-tie by means of a pin.
The rod which connects the reverse-lever wi the reverse-arm of the reverse-shaft. The tongue which fits into the notch of the quadrant by which the reverse-lever is held in the right position.
OR lever by which the direction of motion of the locomotive can be changed, and the travel of the valves increased or decreased.. It
is located in the cab within easy reach of the engineer. The double-cranks connected with the link blocks at one end and the valve-rods at the other, and through which the valves receive the motion of the eccen trics and links.
A pin by which the link-hangers are attached to the saddle-plate, and by means of which the link is raised or lowered.
The plate which fits into and slides in the slot of the link.
Chains fastened to the front-bumper and to the front end of the truck-frame, to prevent the truck from swinging around and breaking the links in case the locomotive happened to run off the track.
Spring-valves attached to the dome-cover, by which the steam-pressure in the boiler is prevented from exceeding a certain limit.
The cylindrical or dome-shaped box attached to the top of the boiler to contain the sand used for the purpose of sanding the rails in order to increase the adhesion, and prevent the driving-wheels from slipping at starting, or when hauling • heavy load, or when running up a heavy grade.
The pipes on each side of the locomotive through which the sand from the sand-box is conveyed to the rails in front of the driving-wheels.