The rule is held together with stamped aluminum contoured posts. The front of the base has (Lr) H, (fx)2, A, D, L, and Ln scales. The front of the slide has (Cr) B, S, T, CI, and C scales. The left end of the slide is marked (facing vertically): ELECTRONIC (/) MODEL N-515-T. The back of the rule contains various formula's relating to electronics, such as temperature conversion, Ohm's Law for AC and DC circuits, parallel resistance, coupled inductance, and efficiency.Short (approximately 4 inches) scales on the slide are used with the reactance and resonance decimal point located at the left end of the rule. A logo at the right end of the slide the Cleveland Institute of Electronics logo. The lower right corner of the back of the rule is marked: CLEVELAND INSTITUTE (/) OF ELECTRONICS (/) CLEVELAND, OHIO 44114 (/) PATENT NO.
3,120,342 (/) MADE IN U. The Cleveland Institute of Electronics worked with Pickett & Eckel, Inc. To develop this slide rule.Geiger, an instructor at the Cleveland Institute, applied for a patent for a slide rule useful in calculations relating to electronics. Patent 3,120,342 was granted in 1964 and incorporated into the Pickett Model N-515 slide rule. The Cleveland Institute, a distance education institution, utilized programmed learning. The item "Pickett N-515-T Slide Rule Cleveland Institute of Electronics USA Made, Unused" is in sale since Tuesday, July 20, 2021. This item is in the category "Collectibles\Science & Medicine (1930-Now)\Engineering\Slide Rules". The seller is "rsc_14624" and is located in Rochester, New York. This item can be shipped worldwide.