MECHANICAL CALCULATORS, 20TH CENTURY

i. British Calculators, Ltd. The Bri-Cal Adding Machines. London: Wilkinson Bros, n.d., 8vo, illustrated catalogue from c.1912, original printed paper wrappers, [T&W B259]ii. Burroughs Adding Machine Co. Instructions for Operating the Burroughs Calculator. Detroit: Burroughs Adding Machine Co., 1941, 4to, original printed paper wrappers, [T&W B294]iii. Burroughs Adding Machine Co. The story of figures. Detroit: Burroughs Adding Machine Co., [?1950], 8vo, original printed paper wrappers, [T&W B295]iv. Chamard, Charles-Henri. Thèses présentées a la faculté des sciences de l'Université de Paris pour obtenir le titre d'ingénieur-docteur. 1re Thèse Contribution à l’étude des machines à calculer. Paris: Gauthier-Villars, 1942. 8vo, original printed paper wrappers, lacking second thesis, [T&W C63]v. Chappell, Edwin (1883-1938) and Comrie, Leslie John (1893-1950). A new method of second difference integration on the Brunsviga-Dupla machine [with] note on Mr Chappell's method [offprint from:] Monthly Notices of the Royal Astronomical Society, vol. 91, no. 7. Edinburgh: Neill and Co., [1931], 8vo, original printed paper wrappers, [T&W C64, C153; Origins of Cyberspace 263]  vi. Comrie, L.J. On the application of the Brunsviga-Dupla calculating machine to double summation with finite differences [offprint from:] Monthly Notices of the Royal Astronomical Society, Vol. 88, no. 5. Edinburgh: Neill and Co., [1928]. 8vo, original printed paper wrappers, letter by the Brunsviga Calculator Co. (January 1929) loosely inserted, [T&W C135; Origins of Cyberspace 257; Randell 1979 p.119]vii. Comrie, L.J. The nautical almanac office Burroughs machine [offprint from:] Monthly Notices of the Royal Astronomical Society, vol. 92, no. 6. Edinburgh: Neill & Co., 1932, 8vo, 2 photographic plates, original printed paper wrappers, [T&W C152; Origins of Cyberspace 265]viii. Comrie, L.J. The Twin Marchant calculating machine and its application to survey problems. London: Scientific Computing Service Limited, 1945, folio, original printed wrappers, library markings, [T&W C160]ix. Felt & Tarrant Mfg. Co. Applied mechanical arithmetic as practised on the Comptometer. Chicago: Poole Bros for Felt & Tarrant, 1920, oblong 8vo, revised edition, original boards, [T&W F32; Origins of Cyberspace 300; Randell 1979 p.183]x. Felt & Tarrant Mfg. Co. Business arithmetic for use only with the Comptometer adding and calculating machine. Chicago: Felt & Tarrant, 1935, oblong 8vo, revised edition, many exercises completed in pencil, original boards, [T&W F33]xi. Another copy, [T&W F33 bis], worn xii. Felt & Tarrant Mfg. Co. Compometer Adding Machine Operated by Keys Alone. Chicago: Felt & Tarrant, n.d. 8vo, original printed paper wrappers, [T&W F34]xiii. Grime, Natalis & Co. The "Brunsviga" calculating machine. N.p., [c.1894] 8vo, original printed paper wrappers, loose in wrappers, [T&W G86; cf. Origins of Cyberspace 313]xiv. C. & E. Layton. C. & E. Layton's improved Arithmometer. N.p., n.d. 8vo, original printed paper wrappers, [T&W L40]xv. C. & E. Layton. Layton's Improved Arithmometer, 1911-12. N.p., n.d. oblong 8vo, 5th edition, original printed paper wrappers (bought from Roger Gaskell, 1992), [T&W L41]xvi. Lehmer, Derrick H. (1905-1991). A photo-electric number sieve, in The American Mathematical Monthly, vol. 40, no. 7, August-September 1933, 8vo, boards, [T&W L64; Randell 1979 p.145] xvii. Monroe Calculating Machine Co., Inc. Instruction Book: Monroe Adding-Calculator. Orange, NJ: Monroe Calculating Machine Co., 1928, 8vo, original printed paper wrappers, [T&W M117]xviii. Monroe Calculating Machine Co., Inc. Instruction Book: Monroe Adding-Calculator LA-X or Series O Models. Orange, NJ: Monroe Calculating Machine Co., 1947, 8vo, original printed paper wrappers, [T&W M118]xix. Morgan, Bryan. Total to date. London: Burroughs Adding Machine Ltd., 1953, 4to, original pictorial boards, [T&W M129; Origins of Cyberspace 801; Randell 1979 p.153], loss at spinexx. Ohlemutz, Walter. Koordinaten Rechnungen mit Hamann Rechenmaschinen. Berlin: Deutsche Telephonwerke und Kabelindustrie, 1939, folio, original printed paper wrappers, [T&W O28]xxi. Rheinmetall-borsig Aktiengesellschaft Werk. Instructions pour l’emploi des machines à calculer "Métal". N.p., n.d. 8vo, original printed paper wrappers, [T&W R78]xxii. Rheinmetall-borsig Aktiengesellschaft Werk. Rheinmetall Rechen-Maschinen mit elektrischem Antrieb Modelle: KEW Ic KEW IIc. N.p., n.d., 8vo, original printed paper wrappers, with a loosely inserted newsletter (Le Havre Comptable, April 1951), [T&W R79]xxiii. Robertson, John Monteath (1900-1989). "A simple harmonic continuous calculating machine" [in:] The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 7th series, vol. 13, February 1932, 8vo, photographic plate, boards, [T&W R102],  library markings xxiv. Sabielny, Hans (1882-1965); Comrie, L.J. and Hartley, H.O., translators. Modern machine calculation. London: Scientific Computing Service Ltd., 1939, 8vo, photographic plate, original printed paper wrappers, [T&W S1]xxv. Sust, Otto. Die Hamannsche Rechenmachine “Mercedes-Euklid” [offprint from:] Zeitschrift für Instrumentenkunde, 1910, Heft 8. Berlin: Julius Springer, 1910, 4to, original printed paper wrappers, [T&W S217]

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