Hyperbolic Match Output
Model:I-J Function Slide Rule
Scales Front: || ±G, ±Ii1, Im, 1/3X || 1/3X, ±J1, Jm & Jm, C || D, LL3, LL2, LL1, L ||
Scales Back: || Th, Ch, K, A || B, T&T, ST&ST, S&S, C || D, DI, Sh2, Sh1 || (SHANGHAI is imprinted on Cursor)
Gauge Marks: π is on A, B, C, and D; π/4 is on A and B; v is on K.
Cursor Back: Has KW top middle, has mark HP(**) on right, and π/4 on left over A & B scales.
Construction: 25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets.
Information:(The front scales are used to solve cubic and quartic equations. This SHANGHAI I-J Function Slide Rule was designed by Professor Lu Ya, Hefei Industrial University. Manufacturer is unknown as logo on rule is of unfamiliar design).