Source of 1874 Logo

Keuffel & Esser produced slide rules and imported planimeters for over 100 years. This web site is provided to help slide rule and planimeter collectors understand the works of this great American manufacturing company. It tells the story of a company and industry that evolved over five generations.

Catalogs:

• K&E Catalogs and Price Lists

Cross Reference Indexes:

• K&E Slide Rule Cross Reference Index
• K&E Planimeter Cross Reference Index
• K&E Leroy Products

Pictures of Actual Specimens:

• Pictures of K&E Slide Rules
• Pictures of K&E Planimeters

Dating K&E Slide Rules:

• Dating K&E Slide Rules

Cleaning K&E Slide Rules:

• Cleaning Slide Rules

Instruction Manuals:

• K&E Slide Rule Manuals

Special K&E Presentations, Brochures, and Articles About K&E:

• K&E Slide Rule Patents
• Special Brochures and Publications by K&E
• "Mendell Penco Weinbach and the K&E Log Log Vector Slide Rules" by William K Robinson

Slide Rule Collecting Groups:

• The Oughtred Society
• The ISRG (International Slide Rule Group)

Information About This Site:

• About

Fun Stuff

• Zlotnian Calculator
• Fingers Calculator