A RARE EARLY 18TH-CENTURY BRASS SECTOR, SIGNED J.W. GOETZ. FECIT LUDWIGSBURG, THE TWO ARMS ENGRAVED ON ONE SIDE WITH SCALES FOR LIN. ARITHMETICA., L. GEOMETRICA. AND LIN. POLYGON. , THE REVERSE WITH SCALES FOR LIN. CHORDARUM, LIN. SOLIDORUM. AND LIN. METALL -- 12¼IN. (31.1CM.) LONG OPENED SEE COLOUR ILLUSTRATION
A RARE EARLY 18TH-CENTURY BRASS SECTOR, SIGNED J.W. GOETZ. FECIT LUDWIGSBURG, THE TWO ARMS ENGRAVED ON ONE SIDE WITH SCALES FOR LIN. ARITHMETICA., L. GEOMETRICA. AND LIN. POLYGON. , THE REVERSE WITH SCALES FOR LIN. CHORDARUM, LIN. SOLIDORUM. AND LIN. METALL -- 12¼IN. (31.1CM.) LONG OPENED SEE COLOUR ILLUSTRATION
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