A Rare Dollond Parallel Rule, English, Late 18th century,stamped DOLLOND LONDON, the 18-inch ebony rule with veneered ivory scales, two rolling ivory wheels centred by an enamel dial measuring revolutions,
18in (46cm) long
2 1/2in (6.5cm) wide FootnotesThe first rolling parallel rule was invented in 1770 by Anthony George Eckhard F.R.S. and patented by him in 1771, This example was made and sold by Peter and John Dollond in partnership 1766-1804.
Please note that this Lot contains ivory (maker's plaque), export and shipping restrictions apply.
Ivory Act registration reference: K1JFHCUD
A Rare Dollond Parallel Rule, English, Late 18th century,stamped DOLLOND LONDON, the 18-inch ebony rule with veneered ivory scales, two rolling ivory wheels centred by an enamel dial measuring revolutions,
18in (46cm) long
2 1/2in (6.5cm) wide FootnotesThe first rolling parallel rule was invented in 1770 by Anthony George Eckhard F.R.S. and patented by him in 1771, This example was made and sold by Peter and John Dollond in partnership 1766-1804.
Please note that this Lot contains ivory (maker's plaque), export and shipping restrictions apply.
Ivory Act registration reference: K1JFHCUD
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
