But there was a time that it was common to see an engineer with a stick hanging from his belt, instead of a calculator or a cell phone. A Pickett brand slide rule flew to the moon with the ...

this isn’t much of a calculator. Still, it is pretty ingenious how people figured out ways to automate math before we had computers. While I’ll admit it isn’t really a slide rule in the ...

Slide rules such as this 20 inch example were the principal instruments for mathematical calculation until the development of the electronic calculator in the 1970s. It played an incalculable role ...

The slide rule was the evelution of Napier's Rods (or bones) which where used for multiplication. Before the electronic calculator, in 1974, the slide rule was used by scientists and students to ...