Collection of pages from K&E catalogs for the 4165
Urea Index Slide Rule
Catalog page from the 1916 catalog
The Urea Index Slide Rule is 10" mannheim style slide rule with celluloid facings on mahogany. The scales are designed for the calculation of Urea Index and Sodium Cloride Formulae.
The 4165 was first shown in the 1916 slide rule only catalog. The last mention of the 4165 is in the 1925 slide rule only catalog.
- 1916 -- The 4165 slide rule was first introduced.
- 1925 -- The 4165 was last shown in the 1925 catalog.
Links to catalog pages for the 4165 family of slide rules:
Scans: Scans of a 4165