Five (5) Pocket Watch Style Logarithmic Circular Slide Rule Calculators, including four (4) Fowler's calculators, 5 items total. 1st-4th items: Four (4) Fowler andCompany, Manchester, England, calculators, including one (1) "Magnum" Long Scale, one (1) Textile Type E1, one (1) Universal, and one (1) Long Scale, each comprised of a round, silver metal case and two knobs, two (2) calculators with silver metal loops over top knobs,and rotating paper discs with printed mathematical scale notations and dials or cursors, housed in glass. Textile and Long Scale calculators are double sided,Magnum Long Scale and Universal calculators with black plastic to opposite sides. All with maker's marks, center of paper discs. Three (3) housed in original brown leather cases, smallest case with ink inscription from previous owner dated 1945. Textile calculator housed in a cardstock box. Also includes two (2) instruction manuals for the"Magnum" Long Scale calculator and one (1) instruction manual for theTextile calculator. Calculators ranging in size from 3 1/8" dia to 5 1/8" dia. Cases ranging in size from 4" H x3 5/8" W x 7/8" D to 6" H x 5 5/8" W x 1" D. Box – 1 1/4" H x 4 1/2" W x 3 3/4" D. Manuals approximately5" H x 4" W x 1/8" D. 5th item: Circular slide rule calculator, comprised of a round, silver metal case and two knobs, silver metal loops over top knob,and a rotating paper disc with printed mathematical scale notations and cursor housed in glass. Unmarked. 4 1/4" dia. All items late 19th /early 20th century.Provenance: Private West Tennessee Collection. CONDITION: All items in overall good condition with expected scratches to cases and glass. Some toning to paper discs. 1st-4th items: Staining, largest 5/8", to reverse disc, areas of loss, largest 1 1/4", to edges of case of Textile calculator. Cases and boxes with expected wear, surface scratches.