CONSTABLE & CO LTD 



NATURAL SOURCES OF POWER. By ROBERT S. BALL, 

 B.Sc., A.M.Inst.C.E. With lOi Diagrams and Illustrations. 

 Extra Crown 8vo. 6s. net. 



CONTENTS : Preface. Units with Metric Equivalents and Abbreviations 

 Length and Distance. Surf ace and Area. Volumes. Weights and Measures. 

 Pressures. Linear Velocities. Angular Velocities. Acceleration. Energy. 

 Power. Introductory Water Power and Methods of Measuring. Applica- 

 tion of Water Power to the Propulsion of Machinery. The Hydraulic 

 Turbine. Various Types of Turbines. Construction of Water Power 

 Plants. Water Power Installations. The Eegulation of Turbines. Wind 

 Pressure, Velocity, and Methods of 'Measuring. The Application of Wind 

 Power to Industry. The Modern Windmill. Constructional Details. 

 Power of Modern Windmills. Appendices A, B, C. Index. 



METALLURGY 



MALLEABLE CAST IRON. By S. JONES PARSONS, M.E. 



Illustrated. Demy 8vo. 8s. net. 



The information in this volume is thoroughly practical and reliable, and the 

 entire process of manufacture is clearly explained, each stage being treated 

 separately and in detail, while much valuable information will be found in chapters 

 dealing with design, patterns, inspection, machining, supplementary processes, 

 and the application of the material, the use of which has increased so enormously 

 within the last few years that it is now preferred to steel for many purposes. It 

 is freely illustrated with photographs and line drawings, and will be invaluable to 

 the professional man and the student. 



THE PRECIOUS METALS : COMPRISING GOLD, SILVER, 

 AND PLATINUM. By T. KIRKE ROSE, A.R.S.M., D.Sc. Extra 

 Crown 8vo. 6s. net. 



CONTENTS : History of Gold Properties of Gold Compounds of Gold 

 Alloys of Gold Occurrence of Gold in Nature : Gold Ores Extraction of 

 Gold from its Ores : Gold Washing Treatment of Gold Ores by Crushing 

 and Amalgamation Treatment of Gold Ores by Wet Methods Silver and 

 its Alloys Compounds and Ores of Silver The Extraction of Silver from 

 its Ores Refining Gold and Silver The Assay of Gold and Silver Ores 

 The Assay of Gold and Silver Bullion Minting Manufacture of 

 Gold and Silver Wares Platinum Production and Consumption of the 

 Precious Metals. 



AGRICULTURE 



SOILS AND MANURES. By J. ALAN MURRAY, B.Sc. 

 Demy 8vo. 6s. net. 



CONTENTS : Preface. Chapter I. Introductory. Chapter II. The Origin 

 of Soils. Chapter III. Physical Properties of Soils. Chapter IV. 

 Chemistry of Soils. Chapter V. Biology of Soils. Chapter VI. Fertility. 

 Chapter VII. Principles of Manuring. Chapter VIII. Phosphatic 

 Manures. Chapter IX. Phospho- Nitrogenous Manures. Chapter X. 

 Nitrogenous Manures. Chapter XI. Potash Manures. Chapter XII. 

 Compound and Miscellaneous Manures. Chapter XIII. General Manures. 

 Chapter XIV. Farmyard Manure. Appendices. I. Valuation of Manures ; 

 II. Composition and Manurial Value of Various Farm Foods. Index. 



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