| 摘要 |
This invention relates to a perspective drawing machine and more particularly, to a machine which will keep track of a chosen vanishing point. Two machines are disclosed; one, a mechanical machine works to +/-22.5 degrees with an error of +/-4.7%. The second is an electronic machine that corrects for the above error and can have a much wider range. Both machines convert instantly from the left hand vanishing point to the right hand vanishing point and then to a standard drafting machine when required.
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