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Busselton Historical Society > Records

Parallel Ruler

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Overview

This wooden and brass parallel ruler is a drafting instrument which was used by navigators to draw parallel lines on charts. The tool consists of two straight edges joined by two arms which allow them to move closer or further away whilst always remaining parallel to each other.

Historical information

The invention of the parallel ruler was attributed to both Fabrizio Mordente and Taqi al-Din (who died in 1585) around 1584 . However it was not commonly used in Europe until the 18th century.

In the 19th century a retired sea captain, Captain William Andrew Field improved the design by adding a protractor-style scale to the upper edge of one rule, and compass points to the opposing edge, which made reading bearings easier.

Details

Details

Registration number

cwa-org-124-2020.480

Item type

Themes

Material

Width

5 cm

Height or length

28 cm

Depth

0.2000 cm

Keywords

Maritime Objects

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Busselton Historical Society

Busselton Historical Society

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Other items from Busselton Historical Society

Parallel ruler in its open position

Parallel ruler in its open position

Parallel ruler in its closed position

Parallel ruler in its closed position

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