9 INCH BRASS ANTIQUE DRAFTING TOOL PROPORTIONAL DIVIDER SCIENTIFIC INSTRUMENT NICE GIFT

9 INCH BRASS ANTIQUE DRAFTING TOOL PROPORTIONAL DIVIDER SCIENTIFIC INSTRUMENT NICE GIFT

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BRASS ANTIQUE DRAFTING TOOL PROPORTIONAL DIVIDER SCIENTIFIC INSTRUMENT 9" Among several functions, proportional dividers can be used to increase or decrease lengths of lines and diameters of circles, and can they be used to inscribe regular polygons within circles (dividing the circumference of a circle into equal parts). Fine piece of drafting equipment-very well made
!