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. Markings: 422652; ; PAT. June 5, 00 Dec 22 �08.

Alternative Name:

Primary Materials: Celluloid, Mahogany, Glass, Steel

Markings: Old inventory number = 13.

Dimensions (cm):

Length = 57 cm, Width = 5.2 cm, Height = 1.2 cm

Function: Facilitating calculations.

Condition:

Item is in good condition. The glass cursor window is cracked. The cover of the leather case is damadged leaving the case open on one end.

Associated Instruments:

Manufacturer: Keuffel and Esser Co., New York

Date of Manufacture: c. 1935-1938

Provenance:

Donated to UTSIC: No

Historical Notes: