1925 Keuffel & Esser Polyphase Slide Rule Manual

This is an original antique manual for the Keuffel & Esser Polyphase Slide Rule by William E. Breckenridge, Associate in Mathematics at Columbia University.

Title: The Polyphase Slide Rule: A Self-Teaching Manual with Table of Settings, Equivalents, and Gauge Points

Publication Year: Copyright 1925 by Keuffel & Esser

Number of Pages: 86

Approximate Size (in inches): 5¼ x 8

Condition: Cover has detached from interior pages. The booklet is in otherwise very good condition.