A. G. THORNTON Ltd. SLIDE RULES FOR Paragon Works ACCURATE SECTIONAL ENGINEERS 2 King St. West PAPERS AND CLOTHS MANCHESTER D 1916 Illustrated Catalogue, just published, in two editions; Drawing Office (448 pages); Draughtsman’s (160 pages): the most complete Catalogues in the trade. _CONTRACTORS TO H.M. WAR OFFICE AND ADMIRALTY_ _Manufacturers also of Drawing Materials and Drawing Office Stationary._ (ALSO AT MINERVA WORKS AND ALBERT MILLS, MANCHESTER.) MATHEMATICAL INSTRUMENTS SURVEYING INSTRUMENTS SLIDE RULES For Students and Engineers MANNHEIM, POLYPHASE, DUPLEX, ELECTRICAL, LOG-LOG, AND CALCULEX J. H. STEWARD LTD. Scientific Instrument Makers 406 STRAND, and 457 WEST STRAND LONDON, W.C. 2 ------------------------------------------------------------------------ _A True Friend and Trusty Guide_ THE ‘HALDEN CALCULEX’ [Illustration: [Halden Calculex]] ACTUAL SIZE| | | BRITISH MADE The handiest and most perfect form of Slide Rule. Does all that can be done with a straight rule. Complete in Case, with book of instructions, 27/6 post free. J. HALDEN & CO., LTD., 8 ALBERT SQUARE MANCHESTER _Depots_—London, Newcastle-on-Tyne, Birmingham, Glasgow, and Leeds ------------------------------------------------------------------------ [Illustration: [Rope]] ENGINEERING, SURVEYING AND MATHEMATICAL INSTRUMENTS, ETC. SLIDE RULES. JOSEPH CASARTELLI & SON, 43 MARKET STREET, MANCHESTER. Tel. No. 2958 City.| | | Established 1790. ROPE DRIVING Is the most EFFICIENT and most ECONOMICAL METHOD of Power Transmission. The LAMBETH Cotton Driving Rope Is the most EFFICIENT and most ECONOMICAL ROPE for Power Transmission. [Illustration: Made 4 Strand or 3 Strand.] SPECIAL FEATURES: LESS STRETCH THAN ANY OTHER ROPE. MORE PLIABLE THAN ANY OTHER ROPE. GREATER DRIVING POWER THAN ANY OTHER ROPE. THOMAS HART LTD., Lambeth Works, BLACKBURN. ------------------------------------------------------------------------ TRANSCRIBER’S NOTES Page Changed from Changed to