Ivory Sector Calculating Instrument Drawing Set Not Signed Antique

Ivory Sector Calculating Instrument Drawing Set Not Signed Antique

£60

Circa

1875

Country of manufacture

UK and Ireland

Categories: Scientific, Calculating, Surveying Instruments & Mining, Tools

Description

English 19th century 6″ ivory sector unmarked

Typical nineteenth century sector, having scales for inches, decimal feet, lines of sines, tangents, equal parts, chords, numbers (log scales for multiplication), polygons, secants.

Sectors were frequently included in sets of drawing instruments in the eighteenth and nineteenth centuries until made obsolete by the slide rule.

In good sound condition with no damage or repair, little wear, very slight warp, tiny rivet split.

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Dealer information

GB Cog Scientific

As a fine art sculpture graduate I have applied my appreciation and understanding of form and function to my lifelong professional career in the antiques trade. Over forty years dealing in what I considered worthy, within the fields of decorative arts and sciences, I have always purchased over a wide spectrum and look forward to offering an exciting variety of stimulating pieces.

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