THE publication of these tables helps to mark a change in the use of logarithms, both for teaching and practical purposes. Nowadays most teachers use four-figure tables for teaching purposes, even in ...

MR. JACKSON is an experienced editor and computer of logarithmic tables, having already published “Accented Five-Figure Logarithms,” “Pocket Logarithms and other Tables,” &c. Different calculations ...

Aeronautical engineer George Norman Albree (1888–1986) designed airplane components and slide rules. This is an example of his Duplex slide rule, which he intended to be used by grade school children.

This is Norman Albree's pilot model for a two-sided circular logarithmic chart. The side labeled A has a double logarithmic scale arranged in a spiral of seven turns. Its outer edge is marked from 1 ...