The slide rule has a long and distinguished ancestry, our last century could not have been built without the slide rule, yet its direct evidence is almost totally missing to the uninformed eye.

“The slide rule is an instrument that was used to design virtually everything,” says Deborah Douglas, the director of collections and curator of science and technology at the MIT Museum in Cambridge, Mass. It is also said that Buzz Aldrin needed his pocket slide rule for intense last-minute calculations which were complex and didn’t have room for error to successfully land on the moon. NASA engineers used slide rules to build the rockets and plan the whole mission that landed Apollo 11 on the moon. However this seemingly simple tool has a serious resume. The Irony is although the slide rule is similar in name and appearance with a standard ruler, the slide rule was never meant to be used for measuring length or drawing straight lines. The slide rule is used primarily for multiplication and division, and also for functions such as exponents, roots, logarithms, and trigonometry, but typically not for addition or subtraction.

It’s a powerful mechanical computing device, often no larger than a 12-inch ruler, marked with numbers - but part of it slides in an out to show relationships between different sets of numbers. Regardless, there was once a device without which higher level math’s was almost impossible to do in classrooms and workplaces, applicable everywhere from basic trigonometry to complex flight calculations, now has all but disappeared:īefore the smartphone, the laptop and the graphing calculator, there was the slide rule. These tools of education became part of our education for a year or two then we moved on to something greater and fancier. From Bunsen burner to the Protractor, playing audio records in class ranging from history to music lessons, Drawing arcs and circles with a compass in geometry to seeing complicated graphs being represented with ease in graphing calculators, from programming in basic to Virtual Reality.

Man on the moon history