File:Pickett slide rule.jpgen.wikipedia. This is a scan of a Pickett pocket slide rule, done by me, Benjamin Crowell, in 2005. The slide rule does not have a copyright notice on
File:Slide rule example3.jpgwas made by manipulating a scan of a Pickett pocket slide rule, done by me, Benjamin Crowell, in 2005. The slide rule does not have a copyright notice on
File:Slide rule example4.jpgwas made by manipulating a scan of a Pickett pocket slide rule, done by me, Benjamin Crowell, in 2005. The slide rule does not have a copyright notice on
File:Slide rule example1.jpgwas made by manipulating a scan of a Pickett pocket slide rule, done by me, Benjamin Crowell, in 2005. The slide rule does not have a copyright notice on
File:Pickett N4ES slide rule.agr.jpgmay select the license of your choice. English Pickett model N4ES Log-Log Vector Hyperbolic slide rule, reverse side URL: https://commons.wikimedia