Five (5) Keuffel and Esser slide rules including 1 K & E 4175 Kurtz Psychrometric Rule. 1st item: K & E 4065-T, PN 45 45 45, c. 1910. Comprised of two sided celluloid covered mahogany with metal framed glass cursor. Leather case included. 2nd item: K & E 4175 Kurtz Psychrometric Rule, c. 1936. Two-sided paint on wood. 2 piece cardboard case with "Kurtz Psychrometric Slide Rule 4175" embossed. Slide rule – 11" L. 3rd item: K & E 4065, PN 82 82 82. Patent date 1908. Comprised of two-sided celluloid coated mahogany, metal framed glass cursor, and metal L shaped end pieces. Leather case included. Slide Rule – 10" L. Case – 10 1/2" L. 4th item: K & E 4031, PN59 . Comprised of one-sided celluloid coated pear wood, with metal framed cursor. Marked "Pat. June 5, 1900", and "Keuffel & Esser Co., New York". Leather case included. Slide rule – 5 1/2" L. 5th item: K & E 4071 Polyphase Duplex Slide Rule. Comprised of two-sided celluloid coated mahogany, with brass framed cursor. Marked"Pat. Oct. 6, 1891", and "Keuffel & Esser Co. New York". Side rule – 11" L. All items late 19th to early 20th century. Provenance: Private West Tennessee Collection. CONDITION: 1st item: Glass cursor has 1/4" Loss to upper right corner. Paint cracked throughout. Cursor in poor condition. 2nd item: Minor wear. 3rd item: Case is missing leather flap. 4th item: Case missing leather flap.