Log-Log Duplex Slide Rule: Janus Series Dual Face Blundell T50

L. E. Jones

Accession Number: 2010.lej.16


A 10″ PVC slide rule with grooved stock and ridges on the slide. There are stainless steel stops on both sides. The cursor is of transparent glass with stainless steel ends and a single cursor line. Comes with a plastic sleeve and cardboard case. Scales: Front: L (Mantissa), LL1, DF and CF (folded at π), CIF, CI, C, D, LL3, LL2. Back: LL0 and LL00 (Reciprocal log-log scales), A, B, T, ST, S, D, DI, K.

Alternative Name:

Primary Materials: PVC, Stainless Steel, Glass

Markings: Old Inventory Number = 16.

Dimensions (cm):

Length = 32.5 cm, Width = 5.6 cm, Height = 1 cm

Function: Facilitating calculations.

Condition: Item is in very good condition.

Associated Instruments:

Manufacturer: Blundell Rules Ltd.

Date of Manufacture: c. 1948-1964


Donated to UTSIC: No

Historical Notes: