| 摘要 |
<p>A characteristic of this compass is that its centering (45, 51, 27, 43) and/or drawing means (53, 13, 61, 38) are automatically maintained perpendicular to the drawing plane (29) notwithstanding any size variations (S1, S2) in the drawn circumferences (7, 10, 11). Said drawing means can be located either on an eccentric adjustment member (22, 21, 37) orbitally movable about an axis (3, 31, 14, 39) parallel to the compas centering axis (40, 35, 401), or on a slider (48) disposed perpendicular to a pivoting (45) bar (44) and made to advance horizontally by screw (50, 48) movements.</p> |
