KE (ca. ) This is the probably the oldest in my collection, dating back to the year it was first introduced (serial number places it to ). It shares many similar design features with the older 40models further down this page. The rule has an excellent feel, and is made of celluloid covering a mahogany wood core. This ten-inch mahogany duplex linear slide rule is coated with white celluloid and held together with L-shaped metal end pieces. The front of the base has DF and D scales, with CF, CIF, and C scales on the slide. The right end of the slide is marked in red: 3 . The bottom of the base is marked in red: PAT. JUNE 5. '00 DEC'08 KEUFFEL ESSER CO. N.Y. MADE IN www.doorway.rug: manual. nearest repair shop. Or write: Keuffel Esser Company, 20 Whippany Road, Morristown, N. J. GENERAL INFORMATION CARE Rain, snow or dust. During rainfall, protect the instrument with a surveyor's field umbrella. If the instrument gets wet, let it dry in a dust-free place; it is not necessary to wipe it. Excess dust penetrating.
"Certain year group of Keuffel Esser's cursors for duplex rules are known to crumble as the years go by. Manual No. Slide Rule Manual - Log Log Duplex. Condition:The body is fairly clean, no cracks. The Keuffel Esser Company of New York donated this slide rule to the Smithsonian in In , model sold for $ Model , the Log Log Duplex Decitrig, differs from model , the Log Log Duplex Trig, in that the degrees on the trigonometric scales are divided into decimals instead of into minutes. KE (ca. ) This is the probably the oldest in my collection, dating back to the year it was first introduced (serial number places it to ). It shares many similar design features with the older 40models further down this page. The rule has an excellent feel, and is made of celluloid covering a mahogany wood core.
Keuffel and Esser was one of the first American firms to import slide rules from Europe, and became the first company in the United States to manufacture. Priced $ (compare at $). Treasures from Grandma's!!! K E Keuffel Esser Deci-lon 10" Slide Rule 68 with Leather Sleeve In very good used. Table 6 shows the serial number series B, C, and D for Duplex slide rules (, , and ), together with the catalog dates of their various scale sets.
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