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Dual Base Log/Log Exponential Speed Rule: Model N4-ES

L.E. Jones

A 10″ all- metal slide rule, with aluminum stock, slide and stops. The cursor is frameless and made of plastic, with plastic ends. The cursor slides smoothly on the stock, without need of grooves. This slide rule has Pickettʼs “eye-saver” yellow surface. Comes in a leather case. Item includes the original cardboard box with instruction manual. Scales: Front: LL1, LL2, DF/M, CF/M, TH, SH, Ln, L, CI, C, D, LL3, LL4. Back: ∛, DF, CF, CIF, T, T, ST, S, CI, C, D, DI, √.

Accession Number: 2010.lej.15

Alternative Name:

Primary Materials: Aluminum, Plastic


Old Inventory Number = 15.
Markings: “Copyright 1959 Patent Applied For”.

Dimensions (cm): Height = 1, Width = 6.6, Length = 31

Function: For facilitating calculations.


Good: Seems to include original packaging and materials.

Associated Instruments:


Pickett Inc. , Santa Barabara, California, 93102

Date of Manufacture: c. 1964-1975


Additional Information and References:

Historical Notes: