Collection of pages from K&E catalogs for the 4095 Family of Slide Rules


There were 2 different slide rules with the model number 4095. The first 4095 was a triangular shaped slide rule made of metal that is shown in the 1901 and 1903 catalogs. The second 4095 was a duplex slide rule that ended up with several variations. This second group of slide rules was part of a larger group called "Merchant's Slide Rules".

The Triangular Slide Rule (1901-1903):

An article by Conrad Schure in the 2001 Fall issue of the Oughtred Society Journal describes this slide rule. It is a 10" rule with 3 usable faces.

Scale set:

The Triangular slide rule is only shown in the 1901 and 1903 catalogs:

Link to scans of 4095s

The 4095 Merchant's Slide Rule (1915-1942):

There are four slide rules designated as "Merchant's Slide Rule". The 4094 is a 10" Mannheim. The 4095 group is a series of 5", 10", and 20" duplex slide rules. The 4096 is a 20" Mannheim with the same scales as the 4094. The 4150-1 is a 5" plastic Mannheim with an added L scale.

The 4095 family of slide rules are duplex type of slide rules. The 4095, 4095-1, 4095-3, and 4095-5 were constructed on a mahogany frame with celluloid laminated to the surface. The markings are engine divided. The first release in 1915 had the following scales:

The following models are part of the 4095 Merchant's slide rule family and only vary in length:


The 4095 Merchant's slide rule first appeared in the 1915 catalog. The 4095 family last appeared in the 1942 catalog. The following is a brief history of the 4095 family of slide rules as is told in the K&E catalogs that are available at this time. Exact timing is not possible because of the time between catalogs.

Links to catalog pages for the 4095 Merchant's family of slide rules:

Link to scans of 4095 Merchant's slide rules