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Pocket clinometer and square in an embosed leather case, c 1675-1700.

Pocket clinometer and square in an embosed leather case, c 1675-1700.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

On the obverse is the clinometer: this consists of two pinhole sights to be used with a quadrant scale which runs along the base and up the right-hand side of the instrument. The reverse carries an unusual form of engraved square for horary and trigonometric uses. There are two sets of parallel lines - one running vertically and one diagonally. The vertical lines are for hours, the diagonal lines represent degrees and are divided as sines. Made by J Marke, a well-known London instrument maker.

Image Details

Image Ref.
 
10191784

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