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Mannheim Slide Rule: Model K & E, 4051

L.E. Jones

A 20″ Mannheim type slide rule, made of celluloid framed on a mahogany surface. The glass cursor is missing. This slide rule has scales only the top surface and includes metric and imperial rulers on either side. Comes in a black cardboard case. Scales: Front: A, B, C, D. Also has rulers on either side. Back: Conversion tables, equivalents and settings.

Accession Number: 2010.lej.12

Alternative Name:

Primary Materials: Celluloid, Mahogany


Old inventory number = 12.
Markings: “185432; <4051>, Pat, June 5, 1900”.

Dimensions (cm): Height = 1.4, Width = 3, Length = 52.2

Function: For facilitating calculations.


Poor: The glass slide is missing. The slide does not move. Part of the mahogany top surface has split. The bottom of the cardboard case is missing.

Associated Instruments:

Manufacturer: Keuffel and Esser Co., New York

Date of Manufacture: c. 1901-1937


Additional Information and References:

Historical Notes:


  • Donated to UTSIC