Navigator's Gunter scale in boxwood 24" long | Science Museum Group Collection
Slide rule scale - Wikipedia
Gunter's Sector Rule – Master Terebrus
A gunter scale, used for navigation and mathematics. - Longfellow House Washington's Headquarters National Historic Site (U.S. National Park Service) - Highlights from the Museum Collections
Gunter scale
BBC - A History of the World - Object : Gunter's Navigational Scale