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.

The video says the scale is the same as a 30-inch scale, but we think it is closer to 66 inches. Slide rules work using the idea that adding up logarithms is the same as multiplying.

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This paper linear slide rule was ...

But [Mathologer] discusses a recent Reddit post that explains a circular slide rule-like device using a wheel and a stretchable rubber band.