A very rare large antique surveying level standing some 10 inches tall and nearly 24 inches long with its display mount (that’s an eighteen inch rule in the picture), signed on the compass circle in script Adams, Charring Crofs, London .

The detachable telescope has a dust slide and sliding adjustments to the eyepiece lens, for focussing the cross hairs and fine focus by thumbwheel rack & pinion. A bubble level is mounted beneath the telescope in the middle. The telescope tube rests on two hinged “Y” clamps secured by its brass tapered pins. The “Y” clamps are adjustable for height, one with a clamping screw and the other with a worm screw for fine adjustment.

The outer compass scale is graduated clockwise 0-360 degrees. The inner scale is engraved in four 0 to 90 degree quadrants and has a compass rose with eight cardinal points engraved.

The shaped steel needle has a brass cap and is mounted on a jewelled pivot over a steel spike and has a working needle clamp.

The instrument has a staff mounting socket to the underside of the horizontal plate into which a display stand has been fixed.

This is a very rare and early instrument by the best know instrument manufacturing family of the 18th century, supplying only the best instruments to King George and the Prince of Wales. Dudley Adams was at Charring Cross from 1788 to 1796. Despite its age of some 200 years, the instrument is in fine working order.

To avoid any misunderstandings, please ask any questions before bidding.

Lucky buyer contributes to actual shipping costs.

Payment preferred by credit card or in pounds sterling but other currency accepted subject to a small percentage to cover conversion costs.