An American pattern simple graphometer, the mahogany frame with compass needle, inlaid brass protractor and swivelling copper alidade with 2 sights, on shaped stand - 8in. (20.3cm.) wide; and an 18th-Century wooden framed compass, unsigned, with coloured compass card, iron needle, the limb pierced for 2 sights - 11 7/8in. (30.2cm.) long; and an American road gradient level with brass alidade, twin folding sights and plummet, inscribed in pencil on the protractor R J Howden. (3)
An American pattern simple graphometer, the mahogany frame with compass needle, inlaid brass protractor and swivelling copper alidade with 2 sights, on shaped stand - 8in. (20.3cm.) wide; and an 18th-Century wooden framed compass, unsigned, with coloured compass card, iron needle, the limb pierced for 2 sights - 11 7/8in. (30.2cm.) long; and an American road gradient level with brass alidade, twin folding sights and plummet, inscribed in pencil on the protractor R J Howden. (3)
.jpg "Source: Christie's")
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
