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Semi-Elliptical Trammel with Case, by Joseph Jackson, London, Early 18th Century

preview image for Semi-Elliptical Trammel with Case, by Joseph Jackson, London, Early 18th Century
Inventory Number: 30371
Object Type:
Persons: Joseph Jackson
Date Created:
Place Created: London England United Kingdom Europe
Accession Number: 1925-43
Brief Description: Semi-Elliptical Trammel and Fitted Wooden Case.
Primary Inscriptions: Signed, "Josph, Jackson London"
Provenance: Lent by Christ Church, Oxford in 1925.
Collection Group: Orrery Collection
Dimensions:
Height Width Depth Diameter Unit
470 mm

Narratives

Image with multimedia irn 24350

Permalink: http://www.mhs.ox.ac.uk/object/inv/30371

Semi-Elliptical Trammel, by Joseph Jackson, London, Early 18th Century

Inventory Number: 30371
Object Type:
Persons: Joseph Jackson
Date Created:
Place Created: London England United Kingdom Europe
Accession Number: 1925-43
Brief Description: English copper alloy elliptical trammel. Signed, "Josph, Jackson London"; undated. 18th century, before 1759. This is an instrument for drawing ellipses. One half of an ellipse is drawn at a time; the position of the instrument being reversed in order to draw the other half. The T-shaped base, along the arms of which slide the supports controlling the drawing-arm, is fitted with two needle-points to prevent the instrument moving while in use. Supplied with the instrument are a pencil-holder, a pen, and a 'dry line' point. In the holder into which these fit is a small spring so that even contact with the drawing surface is maintained. The holder has a fine screw-adjustment. Gunther (Early Science in Oxford, I, 138-9) quotes a letter from John Bird, the instrument-maker, to John Fanshawe, a Canon of Christ Church and Regius Professor of Divinity, which apparently refers to this instrument.
Primary Inscriptions: Written in ink inside lid "Bird's / Elliptical Trammel / Christ Church"
Provenance: Lent by Christ Church, Oxford in 1925.
Collection Group: Orrery Collection
Dimensions:
Height Width Depth Diameter Unit
470 mm

Narratives

Permalink: http://www.mhs.ox.ac.uk/object/inv/30371

Case for Semi-Elliptic Trammel

Inventory Number: 30371
Object Type:
Persons: Joseph Jackson
Date Created:
Place Created: London England United Kingdom Europe
Accession Number: 1925-43
Brief Description: T-shaped wooden fitted case for Semi-Elliptical Trammel. Hinged lid with three metal hooks to fasten. Dovetail joints to corners. Four compartments to interior.
Primary Inscriptions: Written in ink inside lid "Bird's / Elliptical Trammel / Christ Church"
Provenance: Lent by Christ Church, Oxford in 1925.
Collection Group: Orrery Collection
Dimensions:
Height Width Depth Diameter Unit
470 mm

Narratives

Permalink: http://www.mhs.ox.ac.uk/object/inv/30371