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Pitman—The same as Connecting Rod.
holes or indentations. Planimeter-An instrument for determining the area of indicator
diagrams. Plug-In motor parlance, the Spark Plug. Plunger-A piston. Any object working or sliding within a cavity
made to fit its surface. Plunger Pump-A pump operated by means of a plunger or piston. Port-An opening through which gas is admitted to the cylinder or
base of a motor. Pre-ignition—The igniting or exploding of a charge of gas before the
Primary Coil—A coil for producing low-tension electricity but not
induced current. Primary Winding—The first winding on a spark coil conveying the
primary or low-tension current. Primary Wire—The wire used to convey the primary or low-tension
electrical current. Priming-Pouring or injecting liquid fuel into a cylinder to start
the motor. Placing water in a pump to start its operation. Priming Cup-A cup for priming, usually a small receptacle
attached to the cylinder and connected with the interior by a
valve or cock. Prony Brake—A device for testing the power of gasolene motors. Protractor-An instrument used for determining angles and degrees
of a circle. Puddle Carburetor—A form of carburetor in which the liquid fuel
is in a pool or puddle instead of in a float chamber, and from the
surface of which the gas is drawn. Pyrometer-An instrument for measuring the temperature of exhaust
Quadrant-Any piece of metal in the shape of a quarter circle;
usually applied to the curved, notched piece which holds levers in position.
Rack-A notched, or cogged, bar operating on a cog-wheel for
transmitting rotary motion to reciprocating motion or vice versa. Rack and Pinion—The combination of a rack and a small cog-wheel or pinion.
Radiator-A device for giving off, or radiating, heat and through
which the hot water from the cylinder jacket is passed in order to
cool it. Ratchet Valve-A valve operated by a ratchet gear instead of by
Ratchet Wheel-A disk or wheel with notches or projections so formed
that it will turn in one direction but not in the other by dogs or
lugs dropping into the notches. Ratio—The proportion or relation of one thing to another. Reducer-An appliance for reducing the size of an opening or of a
rod or shaft. Reducing Coupling-A coupling smaller at one end than at the other
for reducing the size of any two pipes or rods which are connected
by the coupling. Reducing Elbow-An elbow with one opening smaller than the other. Relief Cock—A cock or valve placed in the cylinder to relieve the
pressure of compression. Ribbon Vibrator-A vibrator made with a slender or thin piece of
metal to which the contact point is attached. Ring Oiler-A device in the form of a ring which is attached to the
crank shaft and serves to distribute the oil in the crank case to
the bearings and connecting rod. Ring Valve-A valve in the form of a ring or cylindrical section. Rotary Valve-A cylindrical or conical valve which rotates or re
volves on its seat instead of lifting and closing. Ruhmkorff Coil-An induction or vibrator coil.
Scavenging—The cleansing of the cylinder of burnt gases.
current. Self-oiling-Oiling without the aid of mechanical devices. Self-starting-Equipped with a device for starting without turning
or “cranking” the fly-wheel. Set-screw-A screw of hardened steel or other metal used to hold a
shaft or other object in place. Shaft-Any revolving rod for transmitting power or motion. Shaft Bearing—The bearing through which a shaft passes. Shaft Coupling-A coupling for fastening two ends of shafting
Shaft Hanger-A bearing for shafting attached to a frame or post
for fastening to a wall, floor, or ceiling. Shims—Thin pieces of metal placed between joints to keep the two
parts separated. Short Circuit—The passage of electricity from one point to another
without passing through the conductors provided.
of electricity through faulty insulation. Sight Feed—A device by which the flow of oil or other lubricant
may be seen in exactly the amount and condition in which it is
fed to the parts to be lubricated. Silencer-A device for silencing the noise of the exhaust. Sonoscope-An instrument for determining the location of vibration
or “pound" in a motor. Spark Break—The interruption or breaking of an electrical circuit
to produce a spark. Spark Coil-A coil of either the primary or induction type which
intensifies the electrical current and produces a hotter and larger
spark. Spark Plug-A plug fitted into the cylinder and insulated therefrom
and provided with electrodes or terminals which produce the
spark. Sparking Points—The two terminal points or electrodes from which
the spark is produced. Spindle—A round rod or bar. The tapered or reduced end of a
shaft. Sprocket-A wheel provided with teeth which fit into the links of a
chain for transmitting power or motion. Sprocket Chain—The chain used on a sprocket wheel. Spur Gear—A form of cog-wheel or gear-wheel in which the teeth
are sharp or pointed. Street Elbow-A pipe elbow in which one end is male- and the other
female-threaded. Stud-A piece of projecting metal to which a nut may be attached;
a lug. Stud Bolt-A bolt threaded at each end so that it may be screwed
into a threaded hole and a nut screwed onto the projecting
portion. Stuffing Box—A box or casing through which a shaft passes and which
may be packed to prevent leakage around the shaft. Suction Stroke-The stroke of the piston which draws the charge of
gas into the cylinder or crank case.
Switch-A device by which the electrical current may be turned on
Tachometer-An instrument for measuring the number of revolutions
of a wheel or other object. Tap-A tool for cutting female threads in nuts, holes, etc. Taper Pin-A round, tapered pin used to hold two parts of machin
ery together; especially for fastening a shaft to a wheel or gear. Templet—A pattern or guide for duplicating parts. Terminal—The end of a wire or electrical connection. Thermal-Relating to heat. Thermal Efficiency—The proportion of heat utilized by the engine as
indicated by the power developed as compared with the total heat
contained in the fuel used. Thermal Units—The quantity of heat required to raise one pound of
pure water from 32 degrees to 33 degrees Fahr. Thread—A spiral groove cut in a screw, or in a hole, into which a
screw is fitted. Throttle—Any device for regulating the speed of a motor by increas
ing or decreasing the amount of gas entering the combustion
chamber. Thrust—The forward tendency or push of a shaft when operating
under a load. Thrust Bearing—The bearing designed to overcome the friction of
the thrust. Timer-A device for interrupting and connecting the electrical
circuit at certain intervals in order to produce a spark at the
correct time. Timing-So regulating the timer, or the valves of a motor, as to
operate at the proper time to develop the best results. Torque-A twisting or turning force. Two-cycle—A form of motor in which an explosion or impulse occurs
on every upward stroke of the piston or on every complete revolution of the crank shaft.
Union-A device for connecting two pieces of pipe so that they may
be connected or disconnected without disturbing the rest of the pipe.
Valve-A device for opening or closing a passage.
Valve Cam-A cam which operates a valve.
cams operate. Valve Gear-Gears for operating the valves. Valve Port—The opening through, or beneath, a valve which is
opened or closed by the action of the valve. Valve Rod—A rod for operating a valve. Valve Seat—The portion of the valve box upon which the valve rests
when closed. In a rotary or slide valve the portion around the
valve against which it bears. Valve Stem—The spindle or shaft that connects the valve with its
foot or handle. Vaporizer—A device for vaporizing or transforming liquid fuel to a
gaseous state by mixing it with air. Vibrator—The part of an induction coil which automatically opens
and closes the circuit of electricity through the coil. Volt-A unit of measurement of electricity denoting the force
of current. Analogous to pressure. Voltage—The amount of volts produced by a battery or generator
and which will flow from it when a circuit is completed. Voltmeter-An instrument for measuring voltage. V-motor-A form of gas engine in which the cylinders are placed at
angles with one another or in “V-shape.” V-thread-A screw thread in which the grooves are angular with
sharp or “V-shaped” angles.
Waste Nut—A flange or plate for fastening pipes to a floor or wall. Water-jacket—The casing outside of a cylinder and which contains
the circulating water. Web—The thin portion of a wheel connecting the hub with the rim. Whitworth Thread-A particular form of screw-thread differing from
the ordinary threads in the shape of the grooves. The standard
British thread. Wipe Break—A form of make-and-break spark in which the spark
is produced by one electrode rubbing or passing over the other. Wipe Spark-A spark produced by a wipe break. Wire Drawing—The pull or resistance caused by overcoming friction
or pressure against moving gas, or in overcoming the resistance
to a spring. Woodruff Key-A form of key which is straight on one side but