Hyperbolic Match Output
Maker: PICKETT & ECKEL (USA)
Model: N4-T Vector - Type LOG LOG Dual - Base Speed Rule
Scales Front:||Three cube root scales 3√ , DF || CF, CIF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ ||
Scales Back: || LL1&LL1, LL2&LL2, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL3&LL3, LL4&LL4 ||
Gauge Marks: Gauge Marks on scales: π , π/4 , and R are on C, D, CF, DF, CF/M, DF/M, CI, DI, and CIF; e is on C, D and LL3; and marks 1° , ' and " are on ST.
Construction: Yellow film over wood, Cursor is not framed, Adjustable metal brackets. Slide rule is wood, 48 inches long and 8 3/4 inches wide. It is printed in black ink with no color scales.