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Pickett Ortho-phase Log Log Slide Rule. Model number 500

L.E. Jones

This 10″ slide rule is made of a magnesium body (stock and slide) and steel stops. The slide has ridges and the stock is grooved. The glass cursor is frameless. Operating guide, a felt case, and a cardboard box are included. Scales Front: LL0, LL00, A, CF, CIF, CI, C, D, K. Back: L, LL1, DF, B, T, ST, S, D, LL3, LL2. Markings: Coyright 1947, R. C. Pickett, A. F. Eckel, Chicago, U. S. A.; H-10; G-10; Model N7O. 500, Ortho-Phase Log Log; Serial number B087762 is printed on the cursor.

Accession Number: 2010.lej.30

Alternative Name:

Primary Materials: Magnesium, Steel, Glass

Markings: Old Inventory Number = 30.

Dimensions (cm):

Length = 31 cm, Width = 5 cm, Height = .7 cm

Function: Facilitating calculations.


Item is in good condition. Due to magnesium expansion and corrosion the slider does not move.

Associated Instruments:


Pickett and Eckel Inc., Chicago 3, Illinois

Date of Manufacture: c. 1948-1950


Additional Information and References:

Historical Notes: