Up for sale is a classic / Vintage Pickett 101-C Circular Slide Rule NIB? (New In Box) with instructions. This would be a great conversation piece at the office or would look great in your slide rule collection. The Pickett 101-C is a surprisingly powerful slide rule for its small size. It has fifteen scales, plus a sixteenth "scale" showing fractional conversions.
Two cursor arms on the obverse, coupled by a simple clutch mechanism, allow it to use a single C scale in place of separate C and D scales, saving space. The A scale is denominated both in decimals and fractions. There are log-log and trig scales.
The cursors are marked to correspond to the scales on the disc C, CI, etc. An amazing amount of computing power is packed into a small slide rule. The Pickett 101-C was modeled after the very successful Gilson Midget slide rule. There are both similarities and differences between them. Mechanically, the Pickett is perhaps a little sturdier than the Gilson.
Which scale layout to prefer is a matter of individual choice. The scales on the reverse side uniformly appear to be somewhat fainter than the scales on the front. This yellow aluminum circular slide rule has three clear plastic indicators, one blank. The other indicator on the front is marked in red to denote the C, CI, A, A. LL2, LL1, DS, DT, and M scales.
The indicator on the back is marked in red to denote the C, S, ST, and T scales. A ring of numbers under the scales on the back permits conversions from fractions to decimals. The center of the front is marked: CIRCULAR SLIDE RULE dial rule (/) PICKETT. The center of the back is marked: dial rule (/) NO 101-C. A triangular Pickett logo, of the form used between 1950 and 1958, appears at the bottom of the center; CHICAGO is printed below the logo.
Hartung, a University of Chicago mathematics professor associated with the company, wrote the instruction manual (1981.0922.13). The booklet is copyrighted 1957, and the logo on this copy was used by the company between 1958 and 1962.Thus, this slide rule dates to about 1958. The item "VIntage Pickett 101-C Circular Slide Rule New In Box with instructions" is in sale since Monday, March 9, 2020. This item is in the category "Collectibles\Science & Medicine (1930-Now)\Engineering\Slide Rules". The seller is "brite_future" and is located in Council Bluffs, Iowa. This item can be shipped worldwide.