In this follow-up Reddit post he discusses the fabrication techniques used for the acrylic circular slide rule shown in the lead photo. It’s always been possible to make your own slide rules ...

Before there were apps for tablets and smartphones, before mathematics education software was easily installed on personal computers, before electronic calculators entered professional practice and ...

Primarily for multiplication and division, the slide rule has two stationary sets and one sliding set of numbers in the center. To multiply, numbers are added; to divide, numbers are subtracted.

The photo shows 7 + 3 = 10 ... While I’ll admit it isn’t really a slide rule in the classic sense, it is still a pretty fun collectible. I’ve talked about regular slide rules before.

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 ...