Hyperbolic Match Output

Number:92e

Maker: RUYI(China)

Model:No. 1081

PHOTO

Scales Front: || sh₀, sh₁, K, A || B T₁, T₂ SRT S C || D, DI, Th ||

Scales Back: || ln_-1 , ln₀, ln₁ , || CF , CIF, H₀, H'₀, CI, C || D, ln₁, ln₀, ln_-1 ||

Gauge Marks: π is on A, B, C, D. π/4 on A and B, ρ'' and ρ' on C. √(40/π). Unknown mark at ~403.

Cursor Front: Has π/4 mark at the right over the A and B scales.

Cursor Back:

Construction: 25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets.

Date:

Source: Daryl Tang Collection

Information: