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 MINERALOGY : THE CHARACTERS OF MINERALS, THEIR CLASSIFICATION AND DESCRIPTION. F. H. Hatch 60 MINING MATHEMATICS (PRELIMINARY). G. W. Stringfellow 16 Do. With Answers 20 MODERN ILLUMINANTS AND ILLUMINATING ENGIN- EERING. Dow and Gaster. . . . 25 MODERN PRACTICE OF COAL MINING. Kerr and Burns. Part 1, 5/- ; Parts 2, 3 and 4, each. 6 MODERN OPTICAL INSTRUMENTS. H. Orford. 4 MODERN MILLING. E. Pull. . . .90 MOTION PICTURE OPERATION, STAGE ELECTRICS AND ILLUSIONS. H. C. Horstmann and V. H. Tousley < 7 6 MOTOR TRUCK AND AUTOMOBILE MOTORS AND MECHANISM. T. H. Russell. . .80 MOTOR BOATS, HYDROPLANES AND HYDROAERO- PLANES. T. H. Russell. . . .80 MOVING LOADS ON RAILWAY UNDERBRIDGES. H. Bamford. . . * * 5 6 OPTICS OF PHOTOGRAPHY AND PHOTOGRAPHIC LENSES. J. T. Taylor ... . .40 PIPES AND TUBES : THEIR CONSTRUCTION AND JOINTING. P. R. Bjorling. . . .40 PLANT WORLD : ITS PAST, PRESENT AND FUTURE, THE. G. Massee SO PLYWOOD AND GLUE, MANUFACTURE AND USE OF, THE. B. C. Boulton. .76 POLYPHASE CURRENTS. A. Still. . .76 POWER WIRING DIAGRAMS. A. T. Dover. .76 PRACTICAL EXERCISES IN HEAT, LIGHT AND SOUND. J. R. Ashworth 26 PRACTICAL ELECTRIC LIGHT FITTING. F. C. Allsop 6 PRACTICAL SHEET AND PLATE METAL WORK. E. A. Atkins 10 PRACTICAL IRONFOUNDING. J. G. Horner. . 10 PRACTICAL TESTING OF ELECTRICAL MACHINES. L. Oulton and N. J. Wilson. . ..60 PRACTICAL TELEPHONE HANDBOOK AND GUIDE TO THE TELEPHONIC EXCHANGE. J. Pooie. . 15 n