| 摘要 |
<p>A surveyor's drafting aid comprising a follower (18) movable by hand along the surface of a structure to be surveyed, and lines (14, 16) connecting the follower to a base station which has a paper support (36) and a marking element (48) cooperating with the paper support, the marking element being drivable from a shaft (40) which is in turn driven from a rotatable carriage (12) rotatably carrying bobbins (20) receiving the lines from the follower.</p> |
