Hyperbolic Match Output
Maker: ARISTO (Germany) Made in Germany
Model: ARISTO HyperboLog No. 0971
Scales Front: || LLo1, LLo2, LLo3, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1||
Scales Back: || Th, K, A || B, T&T, ST, S&S, C || D, DI, Sh2, Sh1 ||
Gauge Marks: π is on A, B, C, D, CF, DF, CI, DI, and CIF. The marks " and ' are on the back C scale; e is on LL2 and LL3.
Cursor Front: Has a mark on right over CF/DF scales (for multiplication of the value on C/D by 36).
Cursor Back: Has marks kW at top middle ; HP(*) at right on vertical line over A & B scales; There is a π/4 vertical line on left over the A & B scales, and √4/π on right over C and D scales.
Date: 1961 - 1972
Source: Herman van Herwijnen Archive
Information: In another version of the same No. 0971 rule the Cursor Back has marks kW at top middle and PS2 at right on vertical line over A & B scales; π/4 is left over the A and B scales; and √4/π is right over the C and D scales.