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Characters device for symmetrical drawings.
Characters device for symmetrical drawings.
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机译:对称图形的字符设备。
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摘要
The drawing instrument is for symmetrical drawings, and comprises a baseplate, on which and on the paper underneath there bears a scale plate with markings round a circular opening. The latter accommodates a circular disc with cut-out portions of different shapes, and markings corresponding to these portions round its periphery. - The scale plate is detachably secured to the baseplate by holding lugs and a locking eccentric. The design allows easy changing of the scale plate, while holding this firmly on the baseplate.(DS)
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