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- English 18th Century Backstaff Davis Quadrant by Benjamin Macy - Made for William Brymer - Vallejo Maritime Gallery, dated 1717

- English 18th Century Backstaff Davis Quadrant by Benjamin Macy - Made for William Brymer - Vallejo Maritime Gallery, dated 1717

The backstaff was invented in 1594 by an English navigator John Davis and he got the idea from the quadrant. It is a navigational instrument that was used to measure the altitude of the celestial body, most likely the sun or the moon. While observing the sun, the person using the quadrant would keep the sun to their back and they would observe the shadow casted by the upper vane on a horizon vane to find the altitude. It was also the predecessor to the octant.

The backstaff was invented in 1594 by an English navigator John Davis and he got the idea from the quadrant. It is a navigational instrument that was used to measure the altitude of the celestial body, most likely the sun or the moon. While observing the sun, the person using the quadrant would keep the sun to their back and they would observe the shadow casted by the upper vane on a horizon vane to find the altitude. It was also the predecessor to the octant.

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