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

L. E. Jones

Accession Number: 2010.lej.15


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, √. Markings: Copyright 1959 Patent Applied For.

Alternative Name:

Primary Materials: Aluminum, Plastic

Markings: Old Inventory Number = 15.

Dimensions (cm):

Length = 31 cm, Width = 6.6 cm, Height = 1 cm

Function: Facilitating calculations.


Item is in very good condition. Seems to include original packaging and materials.

Associated Instruments:


Pickett Inc. , Santa Barabara, California, 93102

Date of Manufacture: c. 1964-1975


Donated to UTSIC: No

Historical Notes: