Four (4) Keuffel and Esser slide rules, including one (1) Webb's Stadia Rule. 1st item: K&E 4105 Webb's Stadia Rule. Comprised out of a wooden cylinder, and a painted metal sleeve lined with felt. Running the length of the sleeve are a slot 1.5 cm wide and a paper scale. 16" L. 2nd item: K&E 4025 Favorite slide rule, PN12-12-9. Comprised of one-sided celluloid coated pear wood, and white metal cursor with decimal counter. 2 piece cardboard case with "Keuffel & Esser Co. Favorite Slide Rule" stamped in gold. Slide rule – 10" L. 3rd item: K & E 4053 slide rule, PN51, 51. Comprised of one-sided celluloid coated with "1900" patent date, glass cursor with "1915" patent date. Leather case included. Slide rule – 10 1/2" L. Case – 11" L. 4th item: K & E 4031 pocket slide rule, PN280, circa 1915-1921. Comprised of one-sided celluloid coated mahogany, with glass cursor. Leather case stamped "Keuffel & Esser Co. NY. Slide Rule – 5 3/8" L. Case – 5 5/8" L. All late 19th to early 20th century. Provenance: Private West Tennessee Collection. CONDITION: 1st item: Metal tube graphics are in poor condition. Paper on wooden tube has a few losses to the paper frome years of use and toning to the paper. 4th item: considerable wear to case. Other items good condition.