#inclined_plane  a simple machine for elevating objects; consists of plane surface that makes an acute angle with the horizontal
  supertype:  #simple_machine__machine  a device for overcoming resistance at one point by applying force at some other point
  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

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