| 摘要 |
Artwork often involves the placement of lettering along the arc of a circle. Practice is to use a compass to lay out the arc and then place the lettering along the arc. The arc is then erased. The present invention provides a lightbox whose platen is fitted with a vertical centerline and a pivot. Basemarks are positioned along the centerline, each at a distance from the pivot equal to the radius of a desired arc. The art sheet is placed on the platen so that the center of the desired arc falls over the pivot. The sheet is rotated about the pivot as successive letters are applied. The desired basemark is used as a position indicator for the base of each letter. The letter is oriented so that the centerline bisects it vertically. In one embodiment the pivot is adapted for use in punching a hole in the art paper.
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