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Priority to ES1971175204UpriorityCriticalpatent/ES175204Y/en
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Publication of ES175204YpublicationCriticalpatent/ES175204Y/en
Improved drawing rule, which being of a transparent nature and being specially designed for topographic works in which the collaboration of a centesimal or sexagesimally graduated circle is required, is essentially characterized by having an axis of rotation perpendicular to the zero division coinciding with the "zero" division. A plane that defines the rule itself, while at the same time a series of divisions whose common center is the axis of rotation, and whose divisions give place, together with the divisions of the graduated circle that is being used, have been transversely planned. To a nonius of circular type, in such a way that the transversal divisions of the rule are superimposed on those of the circle. (Machine-translation by Google Translate, not legally binding)