Hyperbolic Match Output

Number:80

Maker: PICKETT & ECKEL (USA)

Model: N4-T Vector - Type LOG LOG Dual - Base Speed Rule

PHOTO

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: 25 cm.; White film over Aluminum, Cursor is not framed, Adjustable metal brackets.

Date:

Source: Herman's Archive

Information: Same rule but different colors as Model N4-ES Vector - Type LOG LOG Dual - Base Speed Rule which has a yellow plastic film over Aluminum. There is a version with Gold (Brass) end braces and Gold screws on Cursor.