Collection of pages from K&E catalogs for the 4100/4101 Family of Slide Rules

Catalog page from the K&E 1900/1901 catalog


The 4100 and 4101 are specialized slide rules for the Surveying business. They were named Stadia Slide Rules. The 4100 is a 10" Mannheim style slide rule with specialized scales. The 4101 is a 20" version of the same rule. A variant of the rule was offered from 1960 to 1972 called the Kissam Stadia Slide Rule.

The initial offering of the slide rules had a scale set with five scales and the top and bottom edges were plain. Between 1925 and 1927 two more scales were added and centimeter and inch scales were added to the edges for model numbers N4100 and N4101.

The rules shown in the 1895 through 1909 catalogs did not have cursors. The 1913 catalog shows rules with a metal framed glass cursor. The all glass cursor was introduced in 1915. In 1936 the metal rimmed cursor was used.

The following model numbers are part of the 4100/4101 Slide Rule family:

The scale sets for the rules are as follows:

Scale set #1: 4100 (1906-1922) / 4101 (1906-1927)

Scale set #2: N4100 (1925-1960) / N4101 (1928-1949)


The 4100 and 4101 first appeared in the 1901 catalog. Prior to 1900 the 4101 had the model number 1749. The following is a brief history of the 4100/4101 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 4100/4101 family of slide rules:

Scans: Link to scans of 4100/4101s