Five (5) early calculators or slide rulers, including one (1) G. Small Pocket Calculator, Roberts Everard type box rule, G. Charpentier Calculimetre, Sexton's Omnimetre Circular Slide Rule, and one (1) Webb Adder or figure-eight adder. 1st item: The "Small" Pocket Calculator, made by Gilbert Small, Boston, Massachusetts. Comprised of two rotating white laminated metal stacked discs, a metal and yellow glass cursor, and a central, pivoted hub. Includes original leather case. Calculator – 2" dia. Case – 2 1/2" H x 2 1/2" W x 1/2" D. 2nd item: Roberts Everard type 4-sided box rule, made by Edward D. Roberts, London, United Kingdom, each face for different tasks related to the production of alcohol and, more particularly, the imposition of duty on it. Comprised of four-sided boxwood, each side with one sliding scale. 12 1/8" L. 3rd item: G. Charpentier Calculimetre, No. 1796, manufactured by Tavernier – Gravet, Paris, France, sold by Eugene Dietzgen Company, Distributors, Chicago, New York. Comprised of a double-sided silver-colored disc surrounding a rotating brass ring, fork-shaped silver-colored indicator, all attached to a small suspension ring, the indicator extends around the all silver metal back. Maker's marks, front. Includes a black with case with gilt silver blindstamp lettering. Slide rule – 2 1/2" dia., with ring – 3 1/4" dia. Case – 4" H x 2 3/4" W x 1/8" D. 4th item: Sexton's Omnimetre Circular Slide Rule, Numeri Mudum Regunt, copyrighted by Thaddeau Norris in the United States, United Kingdom, and Canada. Comprised of two light brown cardstock discs with a transparent red celluloid arm and a black checkered finger nut at the center, held together by a brass colored fastener, visible en verso. Maker's marks and dated "1895" front and back. Includes one instruction sheet, printed by Craig, Finlet, and Company, Philadelphia, 1897. Slide rule – 7 1/4" dia. Instruction sheet – 7 3/8" square. 5th item: Webb Adder or figure-eight adder, unmarked but similar to those manufactured by Victor Adding Machine Company, Chicago, Illinois. Comprised of conjoined two nickeled brass wheels with a four digit read-out window in the center to the front. Checkered back. Includes a red leather case and stylus. Adder – 6 5/8" H x 4 1/2" W x 3/8" D. Case – 6 3/4" H x 4 3/4" W x 1/4" D. Stylus – 3 7/8" L. All items late 19th/early 20th century. Provenance: Private West Tennessee Collection. CONDITION: All items in overall good condition. 1st item: Oxidation to metal, some loss to paint on scales. 3rd item: Indicator to back is slightly bent. 4th item: Overall good condition with stains, toning. 5th item: Stylus is likely a replacement. Wear to case.
Lot 638: 2 Dietzgen 1798 Dempster RotaRule Model AA Previous Item Lot 640: 4 Keuffel & Esser Slide Rules, incl. 4105 Webb's Stadia rule Next Item