Collection of pages from K&E catalogs for the 4098 Slide Rule
There were 2 different slide rules with the model number 4098. The first 4098 was a duplex type slide rule made of metal that is shown in the 1906 through 1916 catalogs. The second 4098 was a 5" Mannheim slide rule that ended up with several variations. This second group of slide rules was part of a larger group called "EverThere Slide Rules".
The 4098 Metal Duplex Slide Rule (1906-1916):
Very little is known about this slide rule. The catalogs descriptions are minimum without illustrations. The following is the description from the 1909 catalog:
"Duplex Slide Rule, 10 in., engine divided, for arithmetical computations, all metal, with glass Indicator, in Case, with Manual."
In 1913 the description read as follows:
"Duplex Slide Rule, 10 in., German silver, engine divided, for arithmetical computations, all metal, with glass Indicator, in Case, with Manual."
The 4098 Metal Duplex slide rule appeared in the following catalogs: