Log-Log Duplex Slide Rule: Janus Series Dual Face Blundell T50
Accession Number: 2010.lej.25
A 10″ slide rule made of PVC with grooved rule and ridges on the slide. There are stainless steel stops on both sides. The cursor is of glass with a stainless steel frame and a single cursor line. Comes in a leather case. Scale: 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; Markings: B. R. L. T.50 Janus Series, Made in England.
Primary Materials: PVC, Stainless Steel, Glass
Markings: Old Inventory Number = 25.
Length = 32.5 cm, Width = 5.6 cm, Height = 1.8 cm
Function: Facilitating calculations.
Condition: Item is in very good condition.
Manufacturer: Blundell Rules Ltd.
Date of Manufacture: c. 1948-1964