| 摘要 |
The instrument has a viewing and framing window (1), a chart of ellipses (7), a chart of circles (6), a rule (13), and a gray palette (14). Two handles (11, 12) made of Plexiglas mirror are fixed with a spirit level (10), where the chart of ellipses, the chart of circles, the rule, and the gray palette are printed with black and white dotted lines, so that features of the dotted lines are perfectly visible at the time of aiming a subject to be drawn. Figures and letters are printed in black on white circles. |
