Hyperbolic Match Output

Number:80b

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.

Cursor Front:

Cursor Back:

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.

Date:

Source: eBay

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