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THE SLIDE EULE: A PRACTICAL MANUAL. CHARLES N. PICKWORTH n whitworth scholar; editor of " the mechanical world " ; author of "logarithms for beginners"; "the indicator: its construction and application"; "the indicator diagram: its analysis and calculation," etc. OF THE UNIVERSITY OF
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ELEVENTH EDITION Manchester : Emmott and Co., Limited, 65 King Street; and Charles N. Pick worth, Fallowfield. London : WHITTAKER AND Co., 2 White Hart Street, E.C. New York : D. Van Nostrand Co. 23 Murray Street. [all rights reserved]