| 摘要 |
<p>This invention relates to a rotating guide instrument for drawing circles which, in a preferred embodiment (1) thereof, comprises a transparent sheet (2) provided with rotatable disks (5) which enable circles to be drawn with a free pencil. That instrument affords important advantages resulting, inter alia, from a much reduced overall size relatively to the largest diameters that can be drawn and a high versatility and ease of use.</p> |
