| 摘要 |
<p>The invention concerns a topographic instrument for plotting the drawing of a shape, consisting of a main ruler (3) and a secondary ruler (4), sliding relative to each other, a plurality of main pointer arrows (5) perpendicular to said sliding rulers (3, 4), said main pointer arrows (5) capable of sliding lengthways and along the slide rules, fixing means (19, 20) arranged at the outer ends (7, 8) of said sliding rulers, said fixing means (19, 20) designed for fixing the instrument on the profile, at least a flexible tape (18) passing from the outer end (7) of the main ruler (3), then at the ends (10, 11) of the arrows (5) and finally at the outer end (8) of the secondary ruler (4), so as to define the shape of the profile. The invention is useful for plotting the shape of an aperture frame, such as of a window, door or the like.</p> |
