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Details
A rare early 19th-Century English brass ellipsograph,
by John Farey, 1812, with instructions, in a fitted wooden case -- 15.3cm. (6in.) wide
See Illustrations
The instrument is comprised of two 10.2cm. (4in.) diameter brass circles fitted one over the other. The lower circle has six turned brass legs and a swivelling compass mount. By means of a knurled handle on a short rack and pinion mounted on the lower circle, the two can be slid apart by the distance of approximately one third of the diameter. The circles fit within a square frame, one side of which bears the signature Farey Inv.t London . Parallel to one side there is a movable rule, fixed by two knurl-handled screws, which can be moved backwards or forwards in parallel to the side of the frame. All the various component parts are engraved with letters which correspond to the instructions in the accompanying twelve-page leaflet. This is entitled DESCRIPTION OF AN Instrument FOR DESCRIBING ELLIPSES Invented and made By JOHN FAREY, JUN. 12, UPPER CROWN STREET, WESTMINSTER and dated 1812. The fitted mahogany case is lined with yellow and red plush, with two brass hooks and eyes.
by John Farey, 1812, with instructions, in a fitted wooden case -- 15.3cm. (6in.) wide
See Illustrations
The instrument is comprised of two 10.2cm. (4in.) diameter brass circles fitted one over the other. The lower circle has six turned brass legs and a swivelling compass mount. By means of a knurled handle on a short rack and pinion mounted on the lower circle, the two can be slid apart by the distance of approximately one third of the diameter. The circles fit within a square frame, one side of which bears the signature Farey Inv.
Special notice
No VAT will be charged on the hammer price, but VAT at 17.5% will be added to the buyer's premium which is invoiced on a VAT inclusive basis
Sale room notice
This instrument is lacking its pen and compasses.