| 摘要 |
A machine is provided for use by draftsmen, illustrators and artists in making various axonometric or three dimensional drawings, such as isometric, dimetric, trimetric as well as perspective views. The machine includes a flat working surface which supports drafting paper or the like placed thereon. Provided along the borders of the working surface and visible to the draftsman are changeable construction guide lines along with ellipse angle selection data by use of which the draftsman may prepare various types of three dimensional views. The construction guide reference lines in one embodiment are provided by means of a printed chart on a roll which moves under the working surface, and by moving the chart in one direction or the other the reference lines may be moved according to the requirements of the drawing to be made. Each roll may contain a number of different construction guide lines at different angles in order to make a wide variety of three dimensional views such as isometric, dimetric, trimetric and the like. When used to produce perspective illustrations, each group of depth of field lines is provided with corresponding ellipse angle information whereby three dimensional views may be prepared without the usual plotting requirements and a wide range of scale elevation, distance and perspective angle are readily available.
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