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Ivory Sector

Technical Information

Catalogue No: C1716
Category: Vintage and Antique
Object Type: Indicator/Instrument
Object Name: Ivory Sector
Part No: None
Serial No: None
Manufacturer: Elliott Bros (London) Ltd
Year of Manufacture: Unknown
Dimensions: Width (mm): 160
Height (mm): 3
Depth (mm): 35
Weight (g): 41
Location: Cupboard CH (Display 3) [Main Store]



An ivory sector by Elliott Bros, Strand, London dating from between 1854 and 1880. This is very typical of nineteenth century sectors, having scales for inches, decimal feet, lines of sines, tangents, equal parts, chords, numbers (log scales for multiplication), polygons, secants. It is a six-inch size example.
Sectors were frequently included in sets of drawing instruments in the eighteenth and nineteenth centuries until made obsolete by the slide rule. There are three types of scale on an English sector: sectoral ones (radiating from the hinge centre), which were used for calculation; plane scales (logarithms, sines, tangents) parallel to the edge; and rules (inches, tenths of feet).

The Sector was acquired with the Collection of the late Ron Howard (A similar version can be seen in the Elliott Collection at The Museum of the History of Science in Oxford)

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