Seven (7) Keuffel & Esser (K&E) Slide Rules. 1st item: Early K & E 4070/4071 Polyphase Duplex Slide Rule. Made of two-sided celluloid coated mahogany, U shaped bracket ends with adjusting screw; cursor absent (4070 would have brass chisel, 4071 with glass clamshell). Marked "Pat. Oct. 6. 1891", and "Keuffel & Esser Co. N.Y."; overall length 12 in.
2nd item: K&E 4053-3F Duplex slide rule with magnifier and fitted case ca. 1909-1914. Mahogany frame with celluloid laminated surfaces. The "F" in the model number designates that this 10 inch rule is Finely Divided with the same markings as their 20-inch slide rules; the L scale is marked from 0 to 1000. Metal framed and lined cursor with magnifier attached, marked "Patented June 20, 1922". Overall Length 10 5/8 in.
3rd item: K&E 4087-T 20 in Duplex slide rule. Composed of two-sided celluloid coated mahogany, with laminated edges, with glass "clamshell" indicator in an unmarked metal frame; metal L bracket end pieces. Marked "Keuffel & Esser Co. N.Y." with patent dates "Pat. June 5, '00" and "Dec. 22, '08". Overall 22 1/4 in. L x 1 7/8 in. W.
4th item: K&E N4035 8 in. Mannheim slide rule, "improved" metal rimmed cursor, mahogany construction with celluloid surfacing; scales labeled on left, marked , "Pat. June 5, 1900" and "Keuffel & Esser Co. N.Y." on top rail as well as side of cursor; both frame and slide with serial number 416966 corresponding to year 1933. Contained in orange leather case with "K&E Mannheim Slide Rule" to top of flap. Rule overall 8 11/16 in L.
5th Item: K&E 4071-T Polyphase Duplex slide rule with Trig scales. Mahogany construction with celluloid surfacing including edges; U-shaped open-out end posts; Clamshell style cursor. Overall 11 5/8 in. L.
6th - 7th Items: Two (2) K&E 1746 (D&P) RR track scales, made in Germany by Dennert & Pape, circa 1888. Wood construction with celluloid surfaces, each well marked "Dennert & Pape Altona Patent". One additionally marked "Keuffel & Eser Co. New - York & Chicago". Brass chisel cursors likely reproductions. Overall 10 1/4 in. L.
Condition
All items in overall very good condition with light wear, toning to celluloid, to be expected from age and manner of use. Cases with expected wear, surface grime.
Provenance
Private West Tennessee collection.
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4310 Papermill Drive
Knoxville, TN 37909
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