Pickett and Eckel Dual-Base Log Log Slide Rule with Leather Case

Pickett and Eckel Dual-Base Log Log Slide Rule with Leather Case

Slide-rule

Mathematical instruments

This Pickett and Eckel model 4-ES slide rule is made of aluminum finished in "eye-saver" yellow with black numbers, letters and symbols on both sides of the instrument. It also includes a clear plastic sliding indicator with a centered black line used for performing various calculations. On the left side of the front of the instrument is marked MODEL 4-ES DUAL-BASE LOG LOG RECIPROCAL SCALE (VECTOR HYPERBOLIC). The front is also marked with DF, CF, T, ST, S, CI, C, D, and DI scales.

The back of the slide-rule is marked with PATENTS APPLIED FOR on the left side and PICKETT & ECKEL, INC. CHICAGO 3. ILL U.S.A 300 on the right side. The back is marked with LL1, LL2, DF/M, CF/M, TH, SH, L, CI, C, D, LL3, AND LL4 scales.

The slide-rule also includes a leather case stamped with PICKETT and CALIFORNIA SADDLE LEATHER.

This slide-rule belonged to Walter Stewart and is marked with his name on the front of the instrument and hand-written inside the leather case. It was acquired from his estate ca. 2016 and the date of manufacture (ca. 1959) was derived from his personal history and the date range available for the instrument.

manufactured by Pickett and Eckel, Inc.

ca. 1959

acquired ca. 2016

31 x 5.3 cm (12 1/4 x 2 1/8 inches)

Physical Object