Collection of pages from K&E catalogs for the 4130

Colby's Sewer Computer


From the 1901 catalog

The Colby's Sewer Computer is unique in its construction. It is made of hardwood and is 20" long. The scales are designed for sewer flow design calculations.

Model numbers in the group:


The 1749-2 was first shown in the 1897 catalog. The last mention of the 4130 is in the 1906 catalog. The following is a brief history of the Colby's Sewer Computer 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 4130 family of slide rules: