| 摘要 |
A drafting system includes a drawing board (12) and drawing instrument(s) (30) for use with the board for the production of perspective drawings. The board includes a drawing surface (20) and guide means (2(L), 2(R)) on at least one side of the drawing surface (20) for cooperative engagement by the instrument(s) (30) to produce perspective views having vanishing points (VP(2L), VP(2R)) at one or both sides of the drawing surface (20). The board (12) further includes guide means (3(T), 3(B)), above and/or below the drawing surface (20) to permit the production of height and/or depth perspective drawings having vanishing points above (VP(3B)) and/or below the drawing surface (20). In one form of the invention (Figure 10) at least some of the guide means are disposed on a removable and replaceable portion (60) of the board to permit use of guide means having different characteristics. |
