Signedengraved in band around rule pen handle: SCHOENNER, GERMANY
stamped on a rule pen: Schoenner Germany
Inscribedstamped on a divider: D.R.P. [Deutsches Reichspatent] / 121855
stamped on compass arm: D.R.P. [Deutsches Reichspatent] / 121855
FunctionThe set of drawing instruments is equipped for drawing and dividing lines, circles, and curves of various kinds. A set of this kind would be useful to draftsmen, architects, navigators, cartographers, engineers, mathematicians, and even artists. The rule pens permit the user to draw consistent inked lines of adjustable thickness. The compasses permit the drawing of circles and arc sections. The lengthening bar can be attached, by loosening and tightening a screw holder at one end, to various instruments to elongate them. Dividers are used to translate proportionate figures.