Instrument for drawing straight lines or curved comprises rigid ruler with slotted sections to receive ends of flexible rulers

摘要

The instrument consists of a rigid ruler (1) with a raised slotted section (1b) along one edge to receive the ends of one or more flexible rulers (2, 3). The slots in the raised section are marked with angles, and the flexible rulers can be bent into various curves by fitting their ends into the slots, and the lines of the curves can then be traced on paper. An auxiliary component with a toothed edge and a pencil holder can be fitted to the flexible rulers to draw larger curves.