Chapter I.--Thermodynamics; First Law of Thermodynamics; Work, Power; Unit of Heat; Mechanical Equivalent; Application of Heat to Bodies; Second Law of Thermodynamics; Specific Heat; Absolute Temperature; Application of Heat to a Perfect Gas; Isothermal Expansion; Adiabatic Expansion; Fusion; Vaporisation; Application of Heat to Water; Superheated Steam. Chapter II.--Theoretical Heat Engine; Cycle; Thermodynamic Efficiency; Perfect Gas Engine; Perfect Steam Engine; Theoretical Diagram of the Real Engine; Clearance; Efficiency * * * * * THE SLIDE VALVE SIMPLY EXPLAINED. By W. J. TENNANT, Asso. M. Inst. Mech. E. The work has been thoroughly revised and enlarged in accordance with the present American Practice. By J. H. KINEALY, D. E., M. Am. Soc. Mech. E. The work is based upon notes and diagrams which were prepared by Mr. Tennant in his lectures to his classes of working engineers and students towards the obtainment of clear _general_ notions upon the Slide Valve, its design, varieties, adjustments and management. They have been revised and considerably added to and in this form the authors believe they will be of considerable value to all engineers and others interested in steam engines. CONTENTS OF CHAPTERS. I. The Simple Slide. II. The Eccentric a Crank. Special Model to give Quantitative Results. III. Advance of the Eccentric. IV. Dead Centre. Order of Cranks. Cushioning and Lead. V. Expansion--Inside and Outside Lap and Lead; Advance affected thereby. Compression. VI. Double-ported and Piston Valves. VII. The Effect of Alterations to Valve and Eccentric. VIII. Note on Link Motions. IX. Note on very early cut-off, and on Reversing Gears in general. The illustrations aim to cover the different kinds of Slide Valves, and the circular diagrams will prove a novel feature. 88 Pages. 41 Illustrations. 12mo. Cloth, $1.00 * * * * * LUBRICANTS, OILS AND GREASES. TREATED THEORETICALLY AND GIVING PRACTICAL INFORMATION REGARDING THEIR COMPOSITION, USES AND MANUFACTURE. _A PRACTICAL GUIDE FOR MANUFACTURERS, ENGINEERS, AND USERS IN GENERAL OF LUBRICANTS._ By ILTYD I. REDWOOD, Associate Member American Society of Mechanical Engineers; Member Society Chemical Industries (England); Author of 'Theoretical and Practical Ammonia Refrigeration,' and a 'Practical Treatise on Mineral Oils and Their By-Products.' CONTENTS. INTRODUCTION.--Lubricants. THEORETICAL.