Collection of pages from K&E catalogs for the 4133 Family of Slide Rules

The Roy Lance Electrical Slide rule


1921 catalog page

The 4133 is a specialized slide rule for Electricians. The 4133 is an 8" Mannheim rule modeled after the 4053-2. The bottom edge has special scales for calculating wire sizes.

The following model numbers are part of the 4133 Slide Rule family:

Scale set #1 (1913-1922) for the 4133:

Scale set #2 (1925-1936) for the N4133:

Scale set #3 (1936-1949) for the N4133:


The 4133 first appeared in a loose addendum to the 1933 hardbound catalog. The following is a brief history of the 4133 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 4133 family of slide rules:

Scans: Link to scans of 4133s