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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 Surveying instruments: plane table and graphometer Orrery Collection plane table and alidade Inventory no. 18184 - Former Display Label Orrery Collection ball and socket joint Orrery Collection in print Former Display Label - The Orrery Collection of Scientific Instruments Former Display Label - The Principal Makers of Instruments in the Orrery Collection Orrery Collection: 1731 Inventory Accession Record : Extract from Annual Report for 1925

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 Surveying instruments: plane table and graphometer Orrery Collection plane table and alidade Inventory no. 18184 - Former Display Label Orrery Collection ball and socket joint Orrery Collection in print Former Display Label - The Orrery Collection of Scientific Instruments Former Display Label - The Principal Makers of Instruments in the Orrery Collection Orrery Collection: 1731 Inventory Accession Record : Extract from Annual Report for 1925

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:	Copper alloy 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. No. 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 Surveying instruments: plane table and graphometer Orrery Collection plane table and alidade Inventory no. 18184 - Former Display Label Orrery Collection ball and socket joint Orrery Collection in print Former Display Label - The Orrery Collection of Scientific Instruments Former Display Label - The Principal Makers of Instruments in the Orrery Collection Orrery Collection: 1731 Inventory Accession Record : Extract from Annual Report for 1925

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