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Pickett Ortho-Phase Duplex Slide Rule. Model Number 1000

L.E. Jones

A 10″ slide rule with a magnesium body (stock and slide) and steel stops. The slide has ridges and the stock is grooved. The cursor is frameless. Includes a black leather case. Scales: Front: A, B, T, ST, S, D, and K. Back: DF, CF, CIF, CI, C, D, and L. Markings: . Coyright 1948, R. C. Pickett, A. F. Eckel, Calif.. U. S. A. Serial 0482595 is printed on the cursor.

Accession Number: 2010.lej.29

Alternative Name:

Primary Materials: Magnesium, Steel, Glass

Markings: Old Inventory Number = 29.

Dimensions (cm):

Length = 31 cm, Width = 4.4 cm, Height = .8 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., Alhambra, California.

Date of Manufacture: c. 1950-1952


Additional Information and References:

Historical Notes: