Maurice Hartung of the University of Chicago wrote this sixteen-page booklet to explain the use of natural log and logarithmic scales placed on Pickett's line of "dual-base" slide rules.

Musicians simply must know their scales and he came up with a papercraft slide rule for major and minor scales. The system is very easy to use.

There are sections for Hemmi Normal Slide Rules, the Electro Slide Rule with Log Log Scale, and the Improved Slide Rule. The leaflet also contains an illustration of reading graduations on the scales, ...

Why fiddle around with the arcane log scales and indexes required to use a slide rule when an inexpensive calculator required nothing more of its owner than the ability to push a few buttons?

You can see how it works in the video below. With a conventional slide rule, the scale is rotated around a cylinder so that it is the same length as a much longer linear scale.

This article was originally published with the title “How to Use the Slide Rule” in Scientific American Magazine Vol. 99 No. 25 (December 1908), p. 455 doi:10. ...

IN this book the author provides and explains then use of two graduated scales, placed adjacent to each other for comparison and fixed together, on one of which numbers can be read off, and on the ...