Hyperbolic Match Output
Model:Duplex Slide Rule No. 255D (For Expert Electrical Engineer)
Scales Front: || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 ||
Scales Back: ||Sh1, Sh2, Th, A || B, TI2&TI2, TI1&TI1, SI&SI, C || D, DI, X, Θ || X is radians; Θ degrees.
Gauge Marks: π is on CF and DF and π/2 is on X; Mark c is on back scale C; e is on LL2 and LL3.
Construction: 25cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets.