#mechanical_device  mechanism consisting of a device that works on mechanical principles
  supertype:  #mechanism  device consisting of a piece of machinery; has moving parts that perform some function
  subtype:  #bellows__bellow__blower  a mechanical device that blows air onto a fire to make it burn more fiercely
  subtype:  #broadcaster.mechanical_device__spreader  a mechanical device for scattering something (seed or fertilizer or sand etc.) in all directions
  subtype:  #bumper  a mechanical device consisting of bars at either end of vehicle absorb shock and prevent damage
  subtype:  #bumper_guard  vertical bars attached to a bumper to prevent locking bumpers with another vehicle
  subtype:  #carburetor__carburettor  mixes air with gasoline vapor prior to explosion
  subtype:  #compressor  a mechanical device that compresses gasses
     subtype:  #air_compressor__aircompressor  a compressor that takes in air at atmospheric pressure and delivers it at a higher pressure
     subtype:  #supercharger  compressor that forces increased oxygen into the cylinders of an internal-combustion engine
  subtype:  #copyholder  mechanical device used in printing; holds the copy for the compositor
  subtype:  #coupler__coupling  a mechanical device that serves to connect the ends of adjacent objects
     subtype:  #clevis  a coupling to attach a drawbar to a plow or wagon or trailer etc.
     subtype:  #clutch.coupler  a coupling that connects or disconnects driving and driven parts of a driving mechanism
        subtype:  #friction_clutch  a clutch in which one part turns the other by the friction between them
           subtype:  #cone_clutch__cone_friction_clutch  a friction clutch in which the frictional surfaces are cone-shaped
           subtype:  #disk_clutch  a friction clutch in which the frictional surfaces are disks
           subtype:  #slip_clutch__slip_friction_clutch  a friction clutch that will slip with the torque is too great
     subtype:  #fluid_drive__fluiddrive  an automotive power coupling
     subtype:  #swivel  a coupling (as in a chain) that has one end that turns on a headed pin
     subtype:  #universal_joint__universaljoint__universal  coupling that connects two rotating shafts allowing freedom of movement in all directions; "in motor vehicles a universal joint allows the driveshaft to move up and down as the vehicle passes over bumps"
  subtype:  #hair_curler__curler__roller__crimper  a mechanical device consisting of a cylindrical tube around which the hair is wound to curl it; "a woman with her head full of curlers is not a pretty sight"
  subtype:  #diaphragm.mechanical_device__stop  a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"
     subtype:  #iris_diaphragm__iris  diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
  subtype:  #dicer  a mechanical device used for dicing food
  subtype:  #dildo  a mechanical device that substitutes for an erect penis to provide vaginal stimulation
     subtype:  #vibrator.dildo  dildo that has a vibrating tip
  subtype:  #electromechanical_device__electromechanicaldevice  a mechanical device that is operated by electricity
  subtype:  #escapement  mechanical device that regulates movement
  subtype:  #gearshift__gearstick__shifter  a mechanical device for engaging and disengaging gears
  subtype:  #hook.mechanical_device__claw  a mechanical device that is curved or bent to suspend or hold or pull something
     subtype:  #ground_tackle__anchor  a mechanical device that prevents a vessel from moving
        subtype:  #grapnel_anchor__grapnelanchor__grapnel  a light anchor for small boats
        subtype:  #mooring_anchor__mooringanchor  an anchor used to hold a mooring buoy or a channel marker in place
        subtype:  #mushroom_anchor  an anchor used for semipermanent moorings; has a bowl-shaped head that will dig in however it falls
        subtype:  #sheet_anchor__sheetanchor__waist_anchor__waistanchor  spare anchor for use in emergency
     subtype:  #pothook  an S-shaped hook to suspend a pot over a fire
        subtype:  #trammel.pothook  an adjustable pothook set in a fireplace
     subtype:  #tenterhook  one of a series of hooks used to hold cloth on a tenter
  subtype:  #simple_machine__machine  a device for overcoming resistance at one point by applying force at some other point
     subtype:  #inclined_plane  a simple machine for elevating objects; consists of plane surface that makes an acute angle with the horizontal
        subtype:  #ramp__incline  an inclined surface or roadway that moves traffic from one level to another
           subtype:  #ski_jump__skijump  a steep downward ramp from which skiers jump
        subtype:  #screw.inclined_plane  a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole
        subtype:  #wedge  something usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them
           subtype:  #ax_head__axe_head__axehead  the cutting head of an ax
           subtype:  #colter__coulter  a sharp steel wedge that precedes the plow and cuts vertically through the soil
           subtype:  #moldboard__mouldboard  wedge formed by the curved part of a steel plow blade that turns the furrow
           subtype:  #plowshare__ploughshare__share  a sharp steel wedge that cuts loose the top layer of soil
           subtype:  #coign__quoin__coigne  expandable metal or wooden wedge used by printers to lock up a form within a chase
           subtype:  #shim  a thin wedge of material (wood or metal or stone) for driving into crevices
     subtype:  #lever.simple_machine  a simple machine that gives a mechanical advantage when given a fulcrum
     subtype:  #pulley-block__pulley__block  a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
        subtype:  #bollock__bullock_block__bullockblock  a pulley-block at the head of a topmast
        subtype:  #fairlead  a pulley-block used to guide a rope forming part of a ship's rigging to avoid chafing
           subtype:  #snatch_block  a pulley-block that can be opened to receive the bight of a rope
        subtype:  #idle_pulley__idler_pulley__idlerpulley__idle_wheel  a pulley on a shaft that presses against a guide belt to guide or tighten it
     subtype:  #wheel  a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
        subtype:  #balance_wheel__balancewheel  a wheel oscillating against the hairspring of a timepiece to regulate its beat
        subtype:  #bicycle_wheel__bicyclewheel  the wheel of a bicycle
        subtype:  #buffing_wheel__buffingwheel  a wheel that is covered with soft material
        subtype:  #cartwheel.wheel  a wheel that has wooden spokes and a metal rim
        subtype:  #car_wheel__carwheel  a wheel that has a tire and rim and hubcap; used to propel the car
           subtype:  #fifth_wheel.car_wheel__spare  an extra car wheel and tire
        subtype:  #daisy_print_wheel__daisyprintwheel__daisy_wheel__daisywheel  a wheel around which is a set of print characters that make a typing impression on paper
        subtype:  #driving_wheel__drivingwheel  a wheel that drives a motor vehicle (transforms torque into a tractive force)
        subtype:  #gear_wheel__gear__cogwheel  a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
           subtype:  #bevel_gear__bevelgear__pinionandcrownwheel__pinion_and_ring_gear  gears that mesh at an angle
              subtype:  #differential_gear__differential  a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves
           subtype:  #escape_wheel  gear that engages a rocking lever
           subtype:  #pinion  a gear with a small number of teeth designed to mesh with a larger wheel or rack
              subtype:  #lantern_pinion__lanternpinion__lantern_wheel__lanternwheel  a small pinion having cylindrical bars instead of teeth, used chiefly in inexpensive clocks
           subtype:  #planetary_gear__planetarygear__epicyclic_gear__epicyclicgear__planet_wheel__planet_gear  an outer gear that revolves about a central sun gear of an epicyclic train
           subtype:  #rack_and_pinion  a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)
           subtype:  #spur_gear__spur_wheel  gear wheels that mesh in the same plane
           subtype:  #sun_gear__sungear  the central gear in a epicyclic train
           subtype:  #worm_gear  gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel); changes the direction of the axis of rotary motion
           subtype:  #worm_wheel  gear with the thread of a worm
        subtype:  #grinding_wheel__emery_wheel__emerywheel  a wheel composed of abrasive material; used for grinding
        subtype:  #handwheel.wheel  a wheel worked by hand
        subtype:  #nosewheel  a wheel located under the nose of an airplane that is part of the plan's landing gear
        subtype:  #paddlewheel  a large wheel fitted with paddles and driven by an engine in order to propel a boat
        subtype:  #potter's_wheel  a horizontal rotating wheel holding the clay being shaped by a potter
        subtype:  #ratchet_wheel__ratchetwheel  toothed wheel held in place by a pawl or detent and turned by a lever
        subtype:  #roller.wheel  a small wheel without spokes (as on a roller skate)
           subtype:  #caster.roller__castor  a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable
        subtype:  #toothed_wheel__toothedwheel__roulette  a wheel with teeth for making a row of perforations
        subtype:  #rowel  a small spiked wheel at the end of a spur
        subtype:  #sprocket_wheel__sprocket  thin wheel with teeth that engage with a chain
        subtype:  #trundle  small wheel or roller
        subtype:  #wagon_wheel__wagonwheel  a wheel of a wagon
        subtype:  #waterwheel__water_wheel__waterwheel  a wheel that rotates by direct action of water; a simple turbine
           subtype:  #millwheel  water wheel that is used to drive machinery in a mill
           subtype:  #noria  a water wheel with buckets attached to the rim; used to raise water for transfer to an irrigation channel
        subtype:  #water_wheel__waterwheel__waterwheel  a wheel with buckets attached to its rim; raises water from a stream or pond
  subtype:  #pantograph  mechanical device used to copy a figure or plan on a different scale
  subtype:  #piston__plunger  mechanical device that has a plunging or thrusting motion
  subtype:  #propeller__propellor  a mechanical device that rotates to push against air or water
     subtype:  #airplane_propeller__airscrew__prop  a propeller that rotates to push against air
     subtype:  #screw_propeller__screw  a propeller with several angled blades that rotates to push against water or air
     subtype:  #variable-pitch_propeller  propeller for which the angle of the blades is adjustable
  subtype:  #pump  a mechanical device that moves fluid or gas by pressure or suction
     subtype:  #air_pump__airpump__vacuum_pump  a pump that moves air in or out of something
        subtype:  #condensation_pump__diffusion_pump__diffusionpump  vacuum pump used to obtain a high vacuum
        subtype:  #inflater__inflator  an air pump operated by hand to inflate something (as a tire)
        subtype:  #ion_pump__ionpump  a vacuum pump that removes gas by ionizing the atoms or molecules and adsorbing them on a metal surface
     subtype:  #aspirator  a pump that draws air or another gas through a liquid
     subtype:  #auxiliary_pump__auxiliarypump__donkey_pump  a supplementary pump available if needed
     subtype:  #bicycle_pump__bicyclepump  a small pump that fills bicycle tires with air
     subtype:  #bilge_pump__bilgepump  a pump to remove bilgewater
     subtype:  #centrifugal_pump__centrifugalpump  a pump that use centrifugal force to discharge fluid into a pipe
     subtype:  #force_pump__forcepump  pump used to force a liquid up and expel it under pressure
     subtype:  #gas_pump__gaspump__gasoline_pump__island_dispenser  a pump in a service station that draws gasoline from underground storage tanks
     subtype:  #grease-gun__gun  a hand-operated pump that resembles a gun; forces grease into parts of a machine
     subtype:  #hand_pump  a pump worked by hand
     subtype:  #heart-lung_machine  a pump to maintain circulation during heart surgery; diverts blood from the heart and oxygenates it and then pumps it through the body
     subtype:  #hydraulic_pump__hydraulicpump__hydraulic_ram__hydraulicram  a water pump that uses the kinetic energy of flowing water to force a small fraction of that water to a reservoir at a higher level
     subtype:  #lift_pump  pump used to lift rather than force a liquid up
     subtype:  #oil_pump__oilpump  a pump that keeps a supply of oil on moving parts
     subtype:  #stirrup_pump__stirruppump  a hand-operated reciprocating pump; used in fighting fires
     subtype:  #suction_pump__suctionpump  a pump for raising fluids by suction
        subtype:  #stomach_pump__stomachpump  a suction pump used to remove the contents of the stomach
        subtype:  #sump_pump  a suction pump for removing liquid from a sump
     subtype:  #water_pump__waterpump  the pump in the cooling system of an automobile that cause the water to circulate
  subtype:  #ratchet__rachet__ratch  mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction
  subtype:  #record_changer__auto-changer__changer  an automatic mechanical device on a record player that causes new records to be played without manual intervention
  subtype:  #reed  mechanical device consisting of a thin strip of stiff material that is fitted into the mouthpiece of woodwind instruments and that vibrates to produce a tone when air streams over it
     subtype:  #double_reed  a pair of joined reeds that vibrate together to produce the sound in some woodwinds
  subtype:  #ride  a mechanical device that you ride for amusement or excitement
     subtype:  #carousel__carrousel__merrygoround__roundabout__whirligig  large mechanical apparatus with seats for children to ride on
     subtype:  #Ferris_wheel  rotating mechanism consisting of a large upright wheel with suspended seats that remain upright as the wheel turns; provides a ride at an amusement park
     subtype:  #roller_coaster__big_dipper__bigdipper__chutethechute  elevated railway in an amusement park (usually with sharp curves and steep inclines)
  subtype:  #seeder.mechanical_device  a mechanical device that sows grass seed or grain evenly over the ground
  subtype:  #shutter.mechanical_device  a mechanical device on a camera that opens and closes to control the time of a photographic exposure
  subtype:  #splicer  a mechanical device for joining two pieces of paper or film or magnetic tape
  subtype:  #splint  an orthopedic mechanical device used to immobilize and protect a part of the body (as a broken leg)
  subtype:  #sprinkler  mechanical device that attaches to a garden hose for watering lawn or garden
  subtype:  #stator_coil__stator  mechanical device consisting of the stationary part of a motor or generator in or around which the rotor revolves
  subtype:  #stoker  a mechanical device for stoking a furnace
  subtype:  #stretcher.mechanical_device  a mechanical device used to make something larger (as shoes or gloves) by stretching it
  subtype:  #striker  the part of a mechanical device that strikes something
     subtype:  #clapper__tongue  metal striker that hangs inside a bell and makes a sound by hitting the side
     subtype:  #firing_pin  striker that ignites the charge by striking the primer
     subtype:  #piano_hammer__pianohammer__hammer  a striker that is covered in felt and that causes the piano strings to vibrate
     subtype:  #gunlock_hammer__gunlockhammer__hammer  the part of a gunlock that strikes the percussion cap when the trigger is pulled
     subtype:  #head.striker  the striking part of a tool; "the head of the hammer"
        subtype:  #golfclub_head__club_head  the head of the golf club that strikes the ball
        subtype:  #hammerhead  the striking part of a hammer
  subtype:  #supply_chamber  a mechanical device for holding something and supplying it as needed
     subtype:  #cartridge_holder__cartridgeholder__cartridge_clip__cartridgeclip__clip__magazine  a metal frame or container holding cartridges; can be inserted into an automatic gun
        subtype:  #pincurl_clip__pincurlclip  a variety of clip for holding pin curls
     subtype:  #magazine.supply_chamber__cartridge  a light-tight supply chamber holding the film and supplying it for exposure as required
  subtype:  #swing.plaything  mechanical device used as a plaything to support someone swinging back and forth
     subtype:  #trapeze  a swing used by circus acrobats
  subtype:  #tone_arm__pickup__pickup_arm  mechanical device consisting of a light balanced arm that carries the cartridge
  subtype:  #trap.mechanical_device  a device to hurl clay pigeons into the air for trapshooters
  subtype:  #vibrator  mechanical device that produces vibratory motion; used for massage
  subtype:  #voting_machine  a mechanical device for recording and counting votes mechanically
  subtype:  #weathervane__wind_vane  mechanical device attached to an elevated structure; rotates freely to show the direction of the wind
     subtype:  #weathercock  weathervane with a vane in the form of a rooster
     subtype:  #wind_tee  weather vane shaped like a T and located at an airfield
  subtype:  #wheelwork  mechanical device including an arrangement of wheel in a machine (especially a train of gears)
     subtype:  #gearing__gears__gear__geartrain__power_train__powertrain__train  wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed; "the fool got his tie caught in the geartrain"
        subtype:  #epicyclic_train__epicyclictrain__epicyclic_gear_train  a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis
        subtype:  #reduction_gear__reductiongear  gearing that reduces an input speed to a slower output speed
  subtype:  #winder  mechanical device around which something can be wound
     subtype:  #bobbin__spool__reel  a winder around which thread or tape or film or other flexible materials can be wound
        subtype:  #filature  a bobbin used in spinning silk into thread
        subtype:  #shuttle  bobbin that passes the weft thread between the warp threads
     subtype:  #reel.winder  winder consisting of a revolving spool with a handle; attached to a fishing rod
  subtype:  #winder.mechanical_device__key  mechanical device used to wind another device that is driven by a spring (as a clock)
     subtype:  #watch_key__watchkey  winder consisting of a key with a square hole; used for winding some watches
  subtype:  #windshield_wiper__windscreen_wiper__wiper__wiper_blade  a mechanical device that cleans the windshield

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