Dietzgen Circular Slide Rule

Dietzgen 1798 dempster rotarule model a 50 inch pocket slide ruler designed and manufactured by jack dempster berkeley california sold by eugene dietzgen company distributors chicago new york.

Dietzgen circular slide rule. If you had a circular slide rule you had some social problems in college. Their slide rules were a bit unusual as they sold their own brand of rules as well as rules made by many different manufacturers but branded under the dietzgen name. 1773 system darmstadt pocket rule. There are 18 scans in 2 zip files.

Instruction manual for bruning 2398 slide rule. Their in house rules closely resembled those of their main competitor k e and can often be mistaken for them. The base of the circular rule is suspended above a central pivot. File 1 brun2398 01 zip 2 07 mb 2 175 006 bytes file 2 brun2398 02 zip 2 21 mb 2 320 609 bytes concise circular slide rules 28n manual.

It has the basic arithmetic scales c d c inverse trigonometric scales and three decades of log log scales reverse of slide. Pilots are required to be proficient on the e6b slide rule. A compact 2 1 2 inch pocket circular slide rule attached to a rectangular data center card with pull out insert. The orange yellow box was the trademark of dietzgen in later years for both slide rules and drafting instruments.

The 1734 microglide rule is the most famous dietzgen rule and incorporates a novel teflon slide bearing for smoother action. Eight 8 circular slide rulers including dietzgen 1798 dempster rotarule model a various gilson models and more. Ideal for those in any general science area working with metric units. From a 1988 speech by seymour cray 1925 1996 father of the super computer in college i had a circular slide rule the 10 inch model.

If you were at the us naval academy in annapolis md. It was their main competitive offering against the k e 4081 3 and post 1460 versalog. This slide rule was standard issue for plebes in 1955. Superb german made slide rule with remarkable functionality for a quasi simplex format.

It provides instructions for using the midget circular slide rule manufactured by gilson slide rule company of stuart fla. File 1 concise28n zip 727 kb 745 449 bytes dietzgen gilson circular slide. That s as big as circular slide rules were made so i had the very top of the line. The rear side has a metric data conversion table the center has a pull out data chart physical data constants formulas and terms.

I went on ebay and bought a dietzgen polymath 1733 decimal trig log log slide rule from the mid 1950s for 2 50 plus 9 50 for shipping. Dietzgen was one of the major us drafting and related supply companies second to keuffel esser. There are 11 scans in 1 zip file.