F.20 Data Sheet MJS-p-0288

Blundell Rules Limited, 506 Academy Duplex, 1970-1980

Serial Number or Date Stamp:

Country: UK Primary construction material: pl Case included?: yes

General Description: Advanced linear log-log vector/hyperbolic duplex slide rule

Length of 1 decade = 10 in, and overall scale length = 10 in. The largest physical dimension is 10 in.

Front Scales: LL01 LL02 LL03 DF [ CF CIF CI C ] D LL3 LL2 LL1

Back Scales: Sh1 Sh2 Th A [ B T ST S ] D DI K L

Notes: Vector slide rule; single hairline on front, 4 on back; yellow-tinted cursor on C/D, A/B, and S/D; Pat. No. 6225/67; case is stiff, not good shape

References: https://osgalleries.org/makers/reference/blundell1.pdf, https://patents.google.com/patent/GB1114917A/en

Date Acquired: 01/20/2023