A RARE MID 18TH-CENTURY GERMAN BRASS GRAPHOMETER, SIGNED J.L. KOCH FECIT BEROLINI 1753, ENGRAVED WITH FINELY DIVIDED SCALE 0-180° (X2), THE POINTER AT THE CENTRE OF THE ALIDADE ENGRAVED WITH AN ACANTHUS LEAF, ONE END OF THE ALIDADE ENGRAVED WITH THE HEAD OF AN EAGLE AND SCROLL, THE OTHER END WITH A SCROLL, THE BASE LINE AND ALIDADE WITH TWO FIXED SIGHTS, THE ALIDADE WITH TWO LOCATING HOLES, SCREW-CUT AND NUMBERED 1 AND 2, THE LOWER SURFACE OF THE STAFF MOUNTING PLATE WITH THREE SHAPED EARED BRASS WING-SCREWS, THE STAFF MOUNTING WITH SINGLE TIGHTENING SCREW, ON WOOD DISPLAY STAND, THE INSTRUMENT -- 12¼IN. (31.1CM.) WIDE SEE COLOUR ILLUSTRATION
A RARE MID 18TH-CENTURY GERMAN BRASS GRAPHOMETER, SIGNED J.L. KOCH FECIT BEROLINI 1753, ENGRAVED WITH FINELY DIVIDED SCALE 0-180° (X2), THE POINTER AT THE CENTRE OF THE ALIDADE ENGRAVED WITH AN ACANTHUS LEAF, ONE END OF THE ALIDADE ENGRAVED WITH THE HEAD OF AN EAGLE AND SCROLL, THE OTHER END WITH A SCROLL, THE BASE LINE AND ALIDADE WITH TWO FIXED SIGHTS, THE ALIDADE WITH TWO LOCATING HOLES, SCREW-CUT AND NUMBERED 1 AND 2, THE LOWER SURFACE OF THE STAFF MOUNTING PLATE WITH THREE SHAPED EARED BRASS WING-SCREWS, THE STAFF MOUNTING WITH SINGLE TIGHTENING SCREW, ON WOOD DISPLAY STAND, THE INSTRUMENT -- 12¼IN. (31.1CM.) WIDE SEE COLOUR ILLUSTRATION
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
