Collection of pages from K&E catalogs for the 4095 Family of Slide Rules
Description:
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:
- A B C D
- A BI CI D
- A S L T D
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:
- Front: DF = CF C = D
- Rear: = CI = D
The following models are part of the 4095 Merchant's slide rule family and only vary in length:
- 4095 ----- 10"
- 4095-1 --- 5"
- 4095-3 --- 10"
- 4095-5 --- 20"
History:
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.
- 1915 -- The 4095 without dash numbers was introduced in the 1915 catalog.
- 1922 -- The 4095 was replaced with the 4095-1, 4095-3, and 4095-5.
- 1927b - The 4095-5 is not shown in the 1927 hard bound catalog.
- 1936 -- The "improved metal framed" cursor was introduced.
- 1941 -- The 4095-1 is not shown in this or later catalogs.
- 1943 -- The 4095-3 is not shown in this or later catalogs.
Links to catalog pages for the 4095 Merchant's family of slide rules:
- 1915 1916 1921 1922 1925 1927a 1927b 1928 1930 1931
- 1932 1933 1934 1936 1937 1939 1941 1941Graph 1942
Link to scans of 4095 Merchant's slide rules