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Clinometer, also known as dip-sector

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probably made in London

Clinometer, also known as dip-sector
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A clinometer is a surveying instrument used for measuring the angle of inclination. This example (pictured here in its wooden case) was made around 1820, probably by Thomas Jones (1775-1852) a scientific instrument maker based in London's Charing Cross.

The box has a trade label for 'Thomas Jones,/ Astronomical, Mathematical, Optical/ AND PHILOSOPHICAL/ Instrument Maker,/ No 13, Panton Street, Haymarket,/ London.' The instrument is inscribed below the scale 'I.2/ Thomas Jones, 62 Charing Cross London.'

Clinometers were used in the measuring of comparative heights of landmarks. They were part of the specialised equipment necessary for coastal mapping. This example appears to based on a design by Edward Troughton, to whom Thomas Jones had been apprenticed.

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