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THE

THERMO-DYNAMIC PRINCIPLES OF

ENGINE DESIGN.

MARINE ENGINEERING: A Manual of. By A. E. SEATON, M.Inst. C.E., M.Inst. Mech. E., M.Inst.N.A. FIFTEENTH EDITION. Revised, Enlarged, and Re-set. Price 21s. net.

"Every student of engineering should possess a copy of this excellent standard work." -Steamship.

THEORY OF THE STEAM TURBINE.

In

By ALEXANDER JUDE. handsome cloth, with 252 Illustrations. 158. net. "Invaluable to students, and also to practical engineers, as it is at once authoritative, ably written, and comprehensive."-Glasgow Herald.

LOCOMOTIVE ENGINEERING: A Manual of. By W. F. PETTIGREW, M.Inst.C.E., and A. F. RAVENSHEAR, B.Sc. SECOND EDITION, Revised. Very fully Illustrated. 21s.

"The standard work upon this important subject."-Railway Magazine. LOCOMOTIVE COMPOUNDING AND SUPERHEATING. GAIRNS. In Large 8vo. Profusely Illustrated.

By J. F. [Shortly.

A MANUAL OF THE STEAM ENGINE AND OTHER PRIME MOVERS. By W. J. MACQUORN RANKINE, LL.D., F.R.S. With Section on Gas, Oil, and Air Engines by BRYAN DONKIN, M. Inst.C.E. SIXTEENTH EDITION. 12s. 6d. STEAM AND STEAM ENGINES: Including Turbines and Boilers. By ANDREW JAMIESON, M. Inst.C.E. FIFTEENTH EDITION. With over 800 pages, and all the Inst.C.E. Questions ever set on THEORY OF HEAT ENGINES. 10s. 6d. "This is UNDOUBTEDLY the MOST VALUABLE and MOST COMPLETE handbook of reference on the subject WHICH NOW EXISTS."-Marine Engineer.

GAS, OIL, AND AIR ENGINES. By BRYAN DONKIN, M. Inst. C.E., M.I.Mech.E. FOURTH EDITION. Revised and Enlarged. Large 8vo. Cloth. 25s. net. "A thoroughly reliable and exhaustive treatise."-Engineering.

THE HEAT EFFICIENCY OF STEAM BOILERS: Land, Marine, and Locomotive. By BRYAN DONKIN, M.Inst.C.E. In 4to. Cloth. Illustrated. 25s. "Probably the most exhaustive résumé that has ever been collected."-Iron and Coal Trades Review.

BOILERS, LAND AND MARINE: Their Construction and Strength. By T. W. TRAILL, M.Inst. C.E., F.E.R.N. FOURTH EDITION. Revised and Enlarged. 12s. 6d. "The MOST VALUABLE WORK on Boilers PUBLISHED IN ENGLAND."-Shipping World. VALVES AND VALVE GEARING: A Practical Text-book for the Use of Engineers, Draughtsmen, and Students. By CHARLES HURST. FOURTH EDITION, thoroughly Revised and Enlarged. 10s. 6d.

With

"As a practical treatise on the subject the book stands without a rival."-Mech. World. HYDRAULIC POWER AND HYDRAULIC MACHINERY. By HENRY ROBINSON, M.Inst.C.E., F.G.S. Thoroughly Revised, Enlarged, and Re-set. over 60 Plates and additional Illustrations. THIRD EDITION. 34s. "A capital work of reference for the hydraulic engineer."-Mechanical World. THE PRINCIPLES AND CONSTRUCTION OF PUMPING MACHINERY (STEAM AND WATER PRESSURE). By HENRY DAVEY, M.I.C.E., M.I.M.E., F.G.S., etc. With Frontispiece, Plates, and over 250 Illustrations. 21s. net. "Undoubtedly the best and most practical treatise on pumping machinery that has yet been published."-Mining Journal.

LUBRICATION AND LUBRICANTS. By LEONARD ARCHBUTT, F.I.C., F.C.S., and R. MOUNTFORD DEELEY, M.I.M.E., F.G.S. SECOND EDITION. Thoroughly Revised.

"Contains practically ALL THAT IS KNOWN on the subject."-Railway Official Gazette. HEAT (Being Volume III. of "A Text-book of Physics ").

By J. H. POYNTING, Sc.D., F.R.S., and J. J. THOMSON, M.A., F.Ř.S. SECOND EDITION. Fully Illustrated. 15s.

"Well up to date, and extremely clear and exact throughout. . . . as clear as it would be possible to make such a text-book."-Nature.

London: Charles Griffin & Co., Ltd., 12 Exeter St., Strand, W.C.

THE

THERMO-DYNAMIC PRINCIPLES

OF ENGINE DESIGN.

BY

L. M. HOBBS,

ENGINEER-LIEUTENANT, R.N.; INSTRUCTOR IN APPLIED MECHANICS AND
MARINE ENGINE DESIGN AT THE ROYAL NAVAL COLLEGE,

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CHARLES GRIFFIN AND COMPANY, LIMITED,

EXETER STREET, STRAND.

1907.

[All rights reserved.]

GENERAL

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THIS book has been written with the object of placing in a concise manner, before engineers and students, the thermodynamic principles underlying the design of various forms of heat engines. With this object in view, no detailed description of the mechanisms of the various types referred to has been attempted except in so far as has been necessary, to explain the theoretical principles involved. To render the book of more use to students, a number of examples have been added as an Appendix.

The calculation of heat quantities by means of the temperature-entropy diagram has been purposely avoided throughout, as it has been thought better, for the sake of uniformity, to treat every type from the pressure-volume point of view only.

I desire to take this opportunity of acknowledging my indebtedness to Professor S. Dunkerley, now of Manchester University, for much information and kindly help—both formerly when his pupil, and also more recently while his assistant at the Royal Naval College, Greenwich.

L. M. HOBBS.

GREENWICH, December 1906.

206767

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