With a Myriad of Scales for Chart and Map Making, English, c. early 20th century, stamped with the signature of Edward Gunter, Lt. Col., registered #270665. The 6″ (15 cm) long boxwood rule has beveled edges to the front, and is stamped both sides with a wealth of scales and equations for chart and map making, especially in surveying. Included are a rectangular protractor, linear reduction scales including with transversals, numerous map conversions including “Normal Scale of Slopes for
Read More...