| 摘要 |
An ellipse drawing instrument which makes it possible to draw an ellipse easily and precisely without requiring special skill. The size and angle of the ellipse can be changed steplessly by a simple adjustment. It includes a base plate, a movable plate, a swivel arm, a swaying lever coupled to the movable plate and the swivel arm, and a writing implement carriage coupled to the movable plate and the swaying lever. When the swivel arm is turned, the writing implement carriage is given movements in two directions which are synthesized into an elliptical motion with respect to the material on which the ellipse is to be drawn.
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