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Various parts of a portable transit instrument, 1799.

Various parts of a portable transit instrument, 1799.
2 2 c m
actual image size: 32cm x 14cm


Engraving showing details of an instrument used for surveying: the top of the vertical axis, with part of the horizontal bar for carrying the upper telescope; part of the circle, with the clamp wheels, screw, and hooks-joint, that give it a slow motion; milled-head-key placed at C for clamping the instrument; feet-screws for levelling; blocks of box-wood, conical rollers, spring; under-side of one of the four screws attached to the octagonal mahogany plane 'for bringing the centre of the instrument by the help of its plummet, over any point on the ground'. Illustration from the first volume of 'An account of the operations carried on for accomplishing a trigonometrical survey of England and Wales' by William Mudge (1762-1820), published in London in 1799.

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© Science Museum / Science & Society Picture Library

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