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MACHINE DRAWING AND DESIGN.

LONGMANS' LIST OF APPARATUS FOR USE IN GEOMETRY, ETC.

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1. LONGMANS' ENGLISH AND METRIC RULER. Marked on one edge in Inches, Eighths, Tenths and. Five-fifths. Centimetres. Price 1d. net.

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A 2 45° 6"
A 3 45° 6" B 3 45° 8" 2/-

Designs A & B. 45° to 60°.

A I 60° 4'

A 2 60° 6"
A 3 60° 8"

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BI 60° 4" each 1/- net.
B 2 60° 6" 1/3
3 60° 81" 2/-
Protractor No. 2. 3"

B

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3. LOW'S IMPROVED PROTRACTORS (Celluloid). radius, marked in degrees, 6d. net. Protractor No. 3. 4" radius, marked in -degrees, 9d. net.

4. LOW'S ADJUSTABLE PROTRACTOR SET SQUARE. 2s. 6d. net. 5. LONGMANS' BLACK BOARD ENGLISH AND METRIC RULE. One Metre; marked in decimetres, centimetres, inches, half-inches and quarterinches. 2s. 6d.

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A Detailed and Illustrated Prospectus will be sent on application. LOW.-Works by DAVID ALLAN LOW, Professor of Engineering, East London Technical College (People's Palace).

AN INTRODUCTION TO MACHINE DRAWING AND DESIGN. With 153 Illustrations and Diagrams. Crown 8vo., 2s. 6d. THE DIAGRAM MEASURER. An Instrument for measuring the Areas of Irregular Figures and specially useful for determining the Mean Effective Pressure from Indicator Diagrams from Steam, Gas and other Engine. Designed by D. A. Low. With Full Instructions for Use. Is. net. LOW AND BEVIS.-A MANUAL OF MACHINE DRAWING AND DESIGN. By DAVID ALLAN Low and ALFRED WILLIAM BEVIS M.I. Mech. E. With 700 Illustrations. 8vo., 7s. 6d.

UNWIN.—THE ELEMENTS OF MACHINE DESIGN. By W. CAWTHORNE UNWIN, F.R.S.

Part I. General Principles, Fastenings, and

Machinery. With 345 Diagrams, etc. Fcp. 8vo., 7s. 6d.

Transmissive

Part II. Chiefly on Engine Details. With 259 Illustrations.

Fcp. 8vo., 6s.

MINERALOGY, MINING, METALLURGY, ETC. BAUERMAN.-Works by HILARY BAUERMAN, F.G.S. MINERALOGY. With 373 Illustrations.

SYSTEMATIC

Fcp. 8vo., 6s.

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STEEL-WORKS MATERIALS. By HARRY BREARLEY and FRED
IBBOTSON, B.Sc. (Lond.), Demonstrator of Micrographic Analysis, University
College, Sheffield. With 85 Illustrations. 8vo., 145. net.

BREARLEY.

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THE ANALYTICAL CHEMISTRY

OF

URANIUM. BY HARRY BREARLEY, Joint Author of Brearley and Ibbotson's
Analysis of Steel-Works Materials'. 8vo., 25. net.

GORE.—THE ART OF ELECTRO-METALLURGY. By G.
GORE, LL.D., F.R.S. With 56 Illustrations. Fcp. 8vo., 6s.

MINERALOGY, MINING, METALLURGY, ETC.-Continued. HUNTINGTON AND M'MILLAN.-METALS: their Properties

and Treatment. By A. K. HUNTINGTON, Professor of Metallurgy in King's College, London, and W. G. M'MILLAN, late Lecturer on Metallurgy in Mason's College, Birmingham. With 122 Illustrations. Fcp. 8vo., 7s. 6d.

LUPTON.-Works by ARNOLD LUPTON, M.I.C.E., F.G.S., etc. MINING. An Elementary Treatise on the Getting of Minerals. With a Geological Map of the British Isles, and 596 Diagrams and Illustrations. Crown 8vo., gs. net.

A PRACTICAL

TREATISE ON MINE SURVEYING.

With 209 Illustrations. 8vo., 12s. net.

RHEAD.-METALLURGY.

By E. L. RHEAD, Lecturer on

Metallurgy at the Municipal Technical School, Manchester. With 94 Illustra tions. Fcp. 8vo., 3s. 6d.

RHEAD AND SEXTON.-ASSAYING AND METALLURGICAL ANALYSIS for the use of Students, Chemists and Assayers.

By E. L. RHEAD, Lecturer on Metallurgy, Municipal School of Technology, Manchester ; and A. HUMBOLDT SEXTON, F.I.C., F.C.S., Professor of Metallurgy, Glasgow and West of Scotland Technical College. 8vo., 10s. 6d. net.

RUTLEY.—THE STUDY OF ROCKS: an Elementary Textbook of Petrology. By F. RUTLEY, F.G.S. With 6 Plates and 88 other Illustrations. Fcp. 8vo., 45. 6d.

ASTRONOMY, NAVIGATION, ETC.

ABBOTT-ELEMENTARY THEORY OF THE TIDES: the Fundamental Theorems Demonstrated without Mathematics and the Influence on the Length of the Day Discussed. By T. K. ABBOTT, B.D., Fellow and Tutor, Trinity College, Dublin. Crown 8vo., 25.

BALL.-Works by Sir ROBERT S. BALL, LL.D., F.R.S. ELEMENTS OF ASTRONOMY. With 130 Figures and Diagrams. Fcp. 8vo., 6s. 6d.

A CLASS-BOOK OF ASTRONOMY.
Fcp. 8vo., Is. 6d.

With 41 Diagrams.

GILL.-TEXT-BOOK ON NAVIGATION AND NAUTICAL
ASTRONOMY. By J. GILL, F.R.A.S., late Head Master of the Liverpool
Corporation Nautical College. 8vo., 10s. 6d.
GOODWIN.-AZIMUTH

TABLES FOR THE HIGHER
DECLINATIONS. (Limits of Declination 24° to 30°, both inclusive.)
Between the Parallels of Latitude o° and 60°. With Examples of the Use of
the Tables in English and French. By H. B. GOODWIN, Naval Instructor,
Royal Navy. Royal 8vo., 7s. 6d.

HERSCHEL.-OUTLINES OF ASTRONOMY. By Sir JOHN F. W. HERSCHEL, Bart., K.H., etc. With 9 Plates and numerous Diagrams. 8vo., 12s.

LAUGHTON-AN

INTRODUCTION TO THE PRACTICAL AND THEORETICAL STUDY OF NAUTICAL SURVEYING. By JOHN KNOX LAUGHTON, M. A., F. R. A.S. With 35 Diagrams. Crown 8vo., 6s. LOWELL.-MARS. By PERCIVAL LOWELL, Fellow American Academy, Member Royal Asiatic Society, Great Britain and Ireland, etc. With 24 Plates. 8vo., 12s. 6d.

ASTRONOMY, NAVIGATION, ETC.-Continued.

MARTIN-NAVIGATION AND NAUTICAL ASTRONOMY. Compiled by Staff Commander W. R. MARTIN, R. N. Royal 8vo., 18s. MERRIFIELD.-A TREATISE ON NAVIGATION.

For

With

the Use of Students. By J. MERRIFIELD, LL.D., F.R.A.S., F.M.S. Charts and Diagrams. Crown 8vo., 5s PARKER.-ELEMENTS OF ASTRONOMY. With Numerous Examples and Examination Papers. By GEORGE W. PARKER, M.A., of Trinity College, Dublin. With 84 Diagrams. 8vo., 5s. 6d. net.

WEBB.-CELESTIAL OBJECTS FOR COMMON TELESCOPES. By the Rev. T. W. WEBB, M.A., F.R.A.S. Fifth Edition, Revised and greatly Enlarged by the Rev. T. E. ESPIN, M.A., F. R.A.S. (Two Volumes.) Vol. I., with Portrait and a Rem niscence of the Author, 2 Plates, and numerous Illustrations. Crown 8vo., 6s. Vol. II., with numerous Illustrations. Crown 8vo., 6s. 6d.

WORKS BY RICHARD A. PROCTOR.

THE MOON: Her Motions, Aspect, Scenery, and Physical Condition. With many Plates and Charts, Wood Engravings, and 2 Lunar Photographs. Crown 8vo., 35. 6d.

OTHER WORLDS THAN OURS: the Plurality of Worlds Studied Under the Light of Recent Scientific Researches. With 14 Illustrations; Map, Charts, etc. Crown 8vo., 3s. 6d.

OUR PLACE AMONG INFINITIES: a Series of Essays contrasting our Little Abode in Space and Time with the Infinities around us. Crown 8vo., 35. 6d.

MYTHS AND MARVELS OF ASTRONOMY.

35. 6d.

Crown 8vo.,

LIGHT SCIENCE FOR LEISURE HOURS: Familiar Essays
on Scientific Subjects, Natural Phenomena, etc. Crown 8vo., 35. 6d.
THE ORBS AROUND US; Essays on the Moon and Planets,
Meteors and Comets, the Sun and Coloured Pairs of Suns. Crown 8vo., 3s. 6d.
THE EXPANSE OF HEAVEN: Essays on the Wonders of the
Firmament. Crown 8vo., 35. 6d.

OTHER SUNS THAN OURS: a Series of Essays on Suns-Old,
Young, and Dead. With other Science Gleanings. Two Essays on Whist,
and Correspondence with Sir John Herschel. With 9 Star-Maps and Diagrams
Crown 8vo., 3s. 6d.

HALF-HOURS WITH THE TELESCOPE: a Popular Guide to the Use of the Telescope as a means of Amusement and Instruction. With 7 Plates. Fcp. 8vo., 2s. 6d.

NEW STAR ATLAS FOR THE LIBRARY, the School, and the Observatory, in Twelve Circular Maps (with Two Index-Plates). With an Introduction on the Study of the Stars. Illustrated by 9 Diagrams. Cr. 8vo., 55.

OVER.

WORKS BY RICHARD A. PROCTOR-Continued.

THE SOUTHERN SKIES: a Plain and Easy Guide to the Constellations of the Southern Hemisphere. Showing in 12 Maps the position of the principal Star-Groups night after night throughout the year. With an Introduction and a separate Explanation of each Map. True for every Year. 4to., 5s.

HALF-HOURS WITH THE STARS: a Plain and Easy Guide to the Knowledge of the Constellations. Showing in 12 Maps the position of the principal Star-Groups night after night throughout the year. With Introduction and a separate Explanation of each Map. True for every Year. 4to., 35. net.

LARGER STAR ATLAS FOR OBSERVERS AND STUDENTS. In Twelve Circular Maps, showing 6000 Stars, 1500 Double Stars, Nebulæ, etc. With 2 Index-Plates. Folio, 155.

THE STARS IN THEIR SEASONS: an Easy Guide to a Knowledge of the Star-Groups. In 12 Large Maps. Imperial 8vo., 5s. ROUGH WAYS MADE SMOOTH. Familiar Essays on Scientific Subjects. Crown 8vo., 35. 6d.

PLEASANT WAYS IN SCIENCE. Crown 8vo., 3s. 6d.

NATURE STUDIES. By R. A. PROCTOR, GRANT Allen, A. WILSON, T. FOSTER, and E. CLODD. Crown 8vo., 3s. 6d.

LEISURE READINGS. By R. A.

PROCTOR, E. CLODD, A. WILSON, T. FOSTER, and A. C. RANYARD. Crown 8vo., 3s. 6d.

PHYSIOGRAPHY AND GEOLOGY.

BIRD.-Works by CHARLES BIRD, B.A.

ELEMENTARY GEOLOGY.

British Isles, and 247 Illustrations.

ADVANCED GEOLOGY.

With Geological Map of the Crown 8vo., 2s. 6d.

A Manual for Students in Advanced

Classes and for General Readers. With over 300 Illustrations, a Geological
Map of the British Isles (coloured), and a set of Questions for Examination.
Crown 8vo., 75. 6d.

GREEN.-PHYSICAL GEOLOGY FOR STUDENTS AND GENERAL READERS. By A. H. GREEN, M.A., F.G.S. With 236 Illustrations. 8vo., 215.

MORGAN.-Works by ALEX. MORGAN, M.A., D.Sc., F.R.S.E. ELEMENTARY PHYSIOGRAPHY. Treated Experimentally. With 4 Maps and 243 Diagrams. Crown 8vo., 2s. 6d.

ADVANCED PHYSIOGRAPHY. With 215 Illustrations. Crown 8vo., 45. 6d.

READE. THE EVOLUTION OF EARTH STRUCTURE: with a Theory of Geomorphic Changes. By T. MELLARD READE, F.G.S., F.R.I.B.A., A. M.I.C. E., etc. With 41 Plates. 8vo., 215. net.

PHYSIOGRAPHY AND GEOLOGY-Continued.

THORNTON.-Works by J. THORNTON, M.A.
ELEMENTARY PRACTICAL PHYSIOGRAPHY.
Part I. With 215 Illustrations. Crown 8vo., 2s. 6d.
Part II. With 98 Illustrations. Crown 8vo., 2s. 6d.

ELEMENTARY PHYSIOGRAPHY: an Introduction to the
Study of Nature. With 13 Maps and 295 Illustrations. With Appendix on
Astronomical Instruments and Measurements. Crown 8vo., 2s. 6d.

ADVANCED PHYSIOGRAPHY.

Illustrations. Crown 8vo., 4s. 6d.

With II Maps and 255

NATURAL HISTORY AND GENERAL SCIENCE. FURNEAUX.-Works by WILLIAM FURNEAUX, F.R.G.S. THE OUTDOOR WORLD; or, The Young Collector's Handbook. With 18 Plates, 16 of which are coloured, and 549 Illustrations in the Text. Crown 8vo., 6s. net.

LIFE IN PONDS AND STREAMS.

With 8 Coloured Plates

and 331 Illustrations in the Text. Crown 8vo., 6s. net.

BUTTERFLIES AND MOTHS (British). With 12 Coloured Plates and 241 Illustrations in the Text. Crown 8vo., 6s. net.

THE SEA SHORE. With 8 Coloured Plates and 300 Illustra

tions in the Text. Crown 8vo., 6s. net.

HUDSON.—Works by W. H. HUDSON, C.M.Z.S.

BRITISH BIRDS. With 8 Coloured Plates from Original Drawings by A. THORBURN, and 8 Plates and 100 Figures by C. E. LODGE, and 3 Illustrations from Photographs. Crown 8vo., 6s. net.

BIRDS AND MAN. Large Crown 8vo., 6s. net.

MILLAIS.—THE NATURAL HISTORY OF THE BRITISH SURFACE-FEEDING DUCKS. By JOHN GUILLE MILLAIS, F.Z.S., etc. With 6 Photogravures and 66 Plates (41 in colours) from Drawings by the Author, ARCHIBALD THORBURN, and from Photographs. Royal 4to., £66s. net.

NANSEN.-THE NORWEGIAN NORTH POLAR EX-
PEDITION, 1893-1896: Scientific Results. Edited by FRIDTJOF NANSEN.
Volume I. With 44 Plates and numerous Illustrations in the Text. Demy
4to., 40s. net.

Volume II. With 2 Charts and 17 Plates. Demy 4to., 30s. net.
Volume III. With 33 Plates.
Volume IV. With 33 Plates.

Demy 4to., 32s. net.

Demy 4to., 215. net.

STANLEY-A FAMILIAR HISTORY OF BIRDS. STANLEY, D.D., formerly Bishop of Norwich. With 160 Illustrations. 8vo., 3s. 6d.

By E.

Crown

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