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Plane Table by John Worgan, London, c. 1696

Inventory Number: 18184
Object Type:
Persons: John Worgan
Date Created: 1696
Place Created: London England United Kingdom Europe
Accession Number: 1925-43
Brief Description: Wooden and brass plane table with compass attached on a bracket, and a removable, hinged, jointed boxwood frame, The frame is used to fasten a piece of paper to the table and is graduated on both sides in degrees and scales of inches, and with stamped fleur-de-lys in groups of three. The compass-card (printed from an engraved copper-plate) is signed, "Iohn Worgan Londini fecit 1696".

The plane table is associated with a separate alidade, and a ball and socket joint for fixing to a tripod head. A removable brass socket for fixing the table to the ball & socket joint is located on the underside of the table.
Primary Inscriptions: Around centre of printed compass card "Iohn Worgan London fecit 1696".
Provenance: Lent by Christ Church, Oxford in 1925.
Collection Group: Orrery Collection
Dimensions:
Height Width Depth Diameter Unit
340 395 mm

Narratives

Image with multimedia irn 24356Image with multimedia irn 24354

Permalink: http://www.mhs.ox.ac.uk/object/inv/18184

Ball and Socket Joint, English, c. 1696

Inventory Number: 18184
Object Type:
Persons: John Worgan
Date Created:
Place Created: London England United Kingdom Europe
Accession Number: 1925-43
Brief Description: Brass ball and socket joint associated with the plane table with alidade, by John Worgan, c. 1696.

The socket has a wing nut for attaching to a tripod or staff, and a ring head screw for tightening the ball.
It is similar in form to the joint on the Thomas Wright drainage level - see Inv 43707.
Primary Inscriptions:
Provenance: Lent by Christ Church, Oxford in 1925.
Collection Group: Orrery Collection
Dimensions:
Height Width Depth Diameter Unit
340 395 mm

Narratives

Image with multimedia irn 17428

Permalink: http://www.mhs.ox.ac.uk/object/inv/18184

Alidade, English, c. 1696

Inventory Number: 18184
Object Type:
Persons: John Worgan
Date Created: c. 1696
Place Created: London England United Kingdom Europe
Accession Number: 1925-43
Brief Description: Separate brass alidade and rule, with detachable sights, associated with John Worgan's plane table.

The alidade has two removable slit and thread sights. One half of the obverse carries a decimally divided 9" diagonal scale; the other has scales of equal parts (10, 16, 20, 24, 32 and 40 to an inch) and two scales of chords. The reverse has a double logarithmic scale of "Numb[ers]", a scale of "Sines" to 90 degrees and a scale of "Tang[ents]" to 45 degrees.
Primary Inscriptions:
Provenance: Lent by Christ Church, Oxford in 1925.
Collection Group: Orrery Collection
Dimensions:
Height Width Depth Diameter Unit
340 395 mm

Narratives

Image with multimedia irn 24354

Permalink: http://www.mhs.ox.ac.uk/object/inv/18184