"Ancient Reduction Compass From The 19th Century"
Reduction compass with crossed legs, made of chromed brass and steel, English manufacture from the 19th century. It is an instrument used to enlarge or reduce a drawing; it was mainly used by cartographers, engineers, and artists to precisely resize drawings and maps.It has two arms, each with a slot in which a movable pivot slides, held by a screw.
The reduction compass was invented by the Swiss scientific instrument maker Jost Burgi (1552-1632) in the early 17th century. This instrument derives from the Roman "whole and half" compass, an ancient example of which was found among the ruins of the Roman city of Pompeii.
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