A fruitwood surveying level, with engraved copper vertical half-circle divided in 2 quadrants, the axis on twin supports from the base with levelling screws - 18ins. (45.7cm.) wide; a wooden surveyor's compass and part level, maker unknown, with edge-bar needle, inscribed compass scale, bubble level, and vertical protractor scale divided in 2 quadrants, the vertical pillars with clamps for a telescope; and a primitive wooden surveying level - 17¼in. (43.8cm.) long. (3)

細節

A fruitwood surveying level, with engraved copper vertical half-circle divided in 2 quadrants, the axis on twin supports from the base with levelling screws - 18ins. (45.7cm.) wide; a wooden surveyor's compass and part level, maker unknown, with edge-bar needle, inscribed compass scale, bubble level, and vertical protractor scale divided in 2 quadrants, the vertical pillars with clamps for a telescope; and a primitive wooden surveying level - 17¼in. (43.8cm.) long. (3)