1. This rule is considered by
many as the apotheosis of the slide rule makes craft. It is a duplex rule with 30 scales
which are:
Front face: T1,T2,K,A,DF[CF,B,CIF,CI,C]D,DI,S,ST,P
Rear face: LL03,LL02,LL01,LL00,W2[W2',CI,L,C,W1']W1,D&LL0,LL1,LL2,LL3
The rules are completely unused and in mint condition. They have sat on the shelf of a dealer for around 25 years. They are in folding plastic "clamshell" cases with clear top and green bottom.
The rule comes with complete original instructions in English