Hyperbolic Match Output
Maker: ARISTO (Germany) Made in Hamburg
Model: ARISTO HyperboLog No. 971
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 scale ST.
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.
Construction: 25 cm.; Plastic; Cursor is not framed. This early version has adjustable metal end brackets.
Date: 1953 - 1960
Source: Rod Lovett Collection