









Slide rules have a long history that began in the 15th century. At that time, navigators were studying a way to calculate the position of stars but were struggling with various heavy mathematical operations. It is during that time of study and research that mathematicians and astronomers developed the logarithmic rule. John Napier, a Scottish aristocrat, is considered to be the first in 1614 to theorize and publish this rule. The logarithmic rule laid down the foundation of the slide rule history. 




Edmund Gunter, an English astronomer, developed the Gunter's line, a logarithmic linear measurement scale. By adding a pair of compasses, it was used has the Gunter's scale to perform various navigation calculations. 


