Sentence Examples


  • 32~ Screw-like or Helical Motson.Since any displacement in a plane can berepresented in general by a rotation, it follows that the only combination of translation and rotation, in which a complex movement which is not a mere rotation is produced, occurs when there is a translation perpendicular to the plane and parallel to the axis of rotation.
  • Such a complex motion is called screw-like or helical motion; for each point in the body describes a helix or screw round the axis of rotation, fixed or instantaneous as the case may ~ be.
  • To cause a body to move in this manner it is usually made of a helical or screw-like figure, and moves in a guide of a corresponding figure.
  • Helical motion and screws adapted to it are said to be right- or left-handed according to the G appearance presented by the rotation to an observer looking towards the direction of the translation.
  • The translation of a body in helical motion is called its advance.

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