29th Apr, 2009 12:00
Maritime and Scientific Models, Instruments & Art ('Popham)
181
[M] A GEORGIAN BRASS NAVIGATOR'S GUNTER-SCALE...
A GEORGIAN BRASS NAVIGATOR'S GUNTER-SCALE RULE
finely incised over both sides and contained within a mahogany case with sliding lid -- 22½in. (57cm.) diameter
Gunter's scale or Gunter's rule, generally called the "Gunter" by seamen, is a plane scale, engraved on one side with the natural lines (as the line of chords, the line of sines, tangents, rhumbs, etc.), and on the other side the corresponding artificial or logarithmic ones. By means of this instrument questions in navigation, trigonometry etc., are solved with the aid of a pair of compasses.
Estimated at £200 - £300
finely incised over both sides and contained within a mahogany case with sliding lid -- 22½in. (57cm.) diameter
Gunter's scale or Gunter's rule, generally called the "Gunter" by seamen, is a plane scale, engraved on one side with the natural lines (as the line of chords, the line of sines, tangents, rhumbs, etc.), and on the other side the corresponding artificial or logarithmic ones. By means of this instrument questions in navigation, trigonometry etc., are solved with the aid of a pair of compasses.
A GEORGIAN BRASS NAVIGATOR'S GUNTER-SCALE RULE
finely incised over both sides and contained within a mahogany case with sliding lid -- 22½in. (57cm.) diameter
Gunter's scale or Gunter's rule, generally called the "Gunter" by seamen, is a plane scale, engraved on one side with the natural lines (as the line of chords, the line of sines, tangents, rhumbs, etc.), and on the other side the corresponding artificial or logarithmic ones. By means of this instrument questions in navigation, trigonometry etc., are solved with the aid of a pair of compasses.
finely incised over both sides and contained within a mahogany case with sliding lid -- 22½in. (57cm.) diameter
Gunter's scale or Gunter's rule, generally called the "Gunter" by seamen, is a plane scale, engraved on one side with the natural lines (as the line of chords, the line of sines, tangents, rhumbs, etc.), and on the other side the corresponding artificial or logarithmic ones. By means of this instrument questions in navigation, trigonometry etc., are solved with the aid of a pair of compasses.
Auction: Maritime and Scientific Models, Instruments & Art ('Popham), 29th Apr, 2009
