Jonathan Sisson

Jonathan Sisson (* 1690, † 1760 or 1749) was an English optician and designer and manufacturer of astronomical and geodetic measuring instruments. He built in 1725 the first to theodolites, which had taken a visor on the alidade a measuring telescope; he improved the circular pitch of mural quadrant and also was concerned about the development of portable quadrant earned, including the Davis quadrant.

His products were known throughout Europe for their high precision; He received one of its major contracts for the University Observatory, founded in 1727 Specola in Bologna. With ( John? ) Graham he built for Greenwich the large 8 -foot mural quadrant and for Le Monnier those of the Paris Observatory.

His son, the young Jeremiah Sisson Sisson (1736-1788) took over after his father, the London company. The he invented navigation gyroscope (rotating mirror ) was used on ships as artificial horizon.