Polyphase Duplex Slide Rule: Model N4088S

L. E. Jones

Accession Number: 2010.lej.13

Description:

A 20″ polyphase duplex slide rule made of celluloid laminated on a mahogany surface. The cursor is made of glass with a metal frame and a single black marking line. Comes in a brown leather case. Scales: Front: K, A, B, S, T, C1, D, L. Back: DF, CF, CIF, C, D.

Alternative Name:

Primary Materials: Celluloid, Mahogany, Glass, Steel

Markings:

Old inventory number = 13.
Markings: “422652; ; PAT. June 5, 00 Dec 22 �08″.

Dimensions (cm): Height = 1.2, Width = 5.2, Length = 57

Function: For facilitating calculations.

Condition:

Good: The glass cursor window is cracked. The cover of the leather case is damaged, leaving the case open on one end.

Associated Instruments:

Manufacturer: Keuffel and Esser Co., New York

Date of Manufacture: c. 1935-1938

Provenance:

Historical Notes: