Hyperbolic Match Output
Maker:DING FENG (China)
Scales Front: || 2D, L, K, A || Tan&Cot, Sin&Cos, H', CI, C || D, Th, Sh1, Sh2 ||
Scales Back: || LL1I, LL2I, LL3I, DF || CF, CIF , H, CI, C || D, LL3, LL2, LL1|| CF and DF are folded at π
Gauge Marks: On front C scale is the mark R.
Construction: 25 cm; Plastic face on laminated wood ;Cursor is framed and has a notched wheel for fine adjutment.
Information: Collection of Daryl Tang