| 摘要 |
The drafting apparatus has only three parts which are the permanently attached first head and blade, the adjustably attached second head, and the thumb screw. The apparatus quickly adjusts to a given surface. If secure attachment is desired, the thumb screw is tightened against the blade to position the second head firmly against a side of the surface opposite the first head. If desired, the second head is easily completely removed, to aid a draftsperson in a given task. The apparatus is not confined to use only on a drafting table. The transparent bevels provide visual access to indicia under part of the blade. The relatively long length of the elongated slot provides for fit to even narrow drawing surfaces.
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