We like mechanical calculators like slide rules, but we have to admit that we had not heard of the Ott Derivimeter that [Chris Staecker] shows us in a recent video. As the name implies ...

AHB2013q009218 Illustration from Complete, Semi-Programmed Teaching Instructions for the Use of Elementary Simplex Math Slide Rule, by Maurice L. Hartung (Santa Barbara, Calif.: Pickett, Inc., 1965) ...

But [Mathologer] discusses a recent Reddit post that explains a circular slide rule-like device using a wheel and a stretchable rubber band. While it probably would be difficult to build the ...

This merger added a range of PIC slide rules to their range. the plastic slide rules where introduced in the 1960s and in 1967 the company became British Thornton. The slide rule was the evelution ...

Subsequent slide rules added scales for trigonometric, powers and root computations. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.