| 摘要 |
A device for forming circles on a drawing surface that includes, in part, a first rotatable member and a second rotatable member. The first rotatable member is substantially flat and includes an opening formed therein. The second rotatable member is resiliently disposed within the opening. A first means elevates the first rotatable member above the drawing surface to prevent smearing of lines on the surface. A second means elevates the second rotatable member above the drawing surface to prevent smearing of lines on the surface and to engage the surface for stabilizing the rotatable member over the surface. The second mechanism elevates the second rotatable member to approximately the same level as the first rotatable member. A plurality of holes are disposed in the first and second rotatable members. The holes accommodate a marking instrument used for forming the circles.
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