Collection of pages from K&E catalogs for the 4125

Colby's Stadia Slide Rule


The Colby's Stadia slide rule is unique in its construction. It is made of hardwood and is 50" long. The scales are designed for Stadia calculations.

Model numbers in the group:

From the 1901 catalog


The 1749-3 was first shown in the 1897 catalog. The last mention of the 4125 is in the 1903 catalog. The following is a brief history of the Colby's Stadia Slide Rule 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 4125 family of slide rules: