The Davis back-staff consisted of a graduated staff, a half-cross in the shape of an arc of a circle on the radius of the staff with a fixed vane, and a brass horizon vane with a slit in it at the fore-end of the staff.
www.rootsweb.ancestry.com/~mosmd/backstaf.htm www.rootsweb.ancestry.com/~mosmd/backstaf.htm
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He was the inventor of the back-staff, sometimes called the Davis Quadrant. He explored the northern coast of America looking for the north-west passage, keeping a day-to-day journal. In his Seaman's Secrets he gave many extracts from that 1593 journal.
www.rootsweb.ancestry.com/~mosmd/17cnav.htm
Backstaff - Wikipedia, the free encyclopedia
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The backstaff or back-quadrant , is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon. When observing the sun, users kept the sun t...
en.wikipedia.org/wiki/Backstaff
; Description: Back-staff ... Item History: The back-staff, also known as the Davis quadrant (called a quadrant because it could measure up to 90º), was the first instrument specifically designed for finding latitude at sea.
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A wooden staff is placed on the cheek and a crossbar is slid along its length until it fits between the body and the horizon. The backstaff was invented in 1590 by John Davis (see his Seaman's Secrets), and allowed the navigator to stand with his back to the sun, working with its shadow.
www.celestialnavigation.net/instruments.html
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