_Long-Span Railway Bridges_, comprising Investigations of the Comparative Theoretical and Practical Advantages of the various adopted or proposed Type Systems of Construction, with numerous Formulæ and Tables giving the weight of Iron or Steel required in Bridges from 300 feet to the limiting Spans; to which are added similar Investigations and Tables relating to Short-span Railway Bridges. Second and revised edition. By B. BAKER, Assoc. Inst. C.E. _Plates_, crown 8vo, cloth, 5_s._ * * * * * _Elementary Theory and Calculation of Iron Bridges and Roofs._ By AUGUST RITTER, Ph.D., Professor at the Polytechnic School at Aix-la-Chapelle. Translated from the third German edition, by H. R. SANKEY, Capt. R.E. With 500 _illustrations_, 8vo, cloth, 15_s._ * * * * * _The Builders Clerk_: a Guide to the Management of a Builder’s Business. By THOMAS BALES. Fcap. 8vo, cloth, 1_s._ 6_d._ * * * * * _The Elementary Principles of Carpentry._ By THOMAS TREDGOLD. Revised from the original edition, and partly re-written, by JOHN THOMAS HURST. Contained in 517 pages of letterpress, and _illustrated with 48 plates and 150 wood engravings_. Third edition, crown 8vo, cloth, 18_s._ Section I. On the Equality and Distribution of Forces--Section II. Resistance of Timber--Section III. Construction of Floors--Section IV. Construction of Roofs--Section V. Construction of Domes and Cupolas--Section VI. Construction of Partitions--Section VII. Scaffolds, Staging, and Gantries--Section VIII. Construction of Centres for Bridges--Section IX. Coffer-dams, Shoring, and Strutting--Section X. Wooden Bridges and Viaducts--Section XI. Joints, Straps, and other Fastenings--Section XII. Timber. * * * * * _Engineering Notes._ By FRANK ROBERTSON, Fellow Roy. Astron. Soc., late first Lieut. R.E., and Civil Engineer Public Works Department in India. 8vo, cloth, 12_s._ 6_d._ The object of this work is to supply an exhaustive digest of all that is known on each subject, so far as is necessary and sufficient for an Engineer in practice, especially in India. * * * * * _The Electric Light in its Practical Application._ By PAGET HIGGS, LL.D., D.Sc., Telford Prizeman, and Associate Member of the Institution of Civil Engineers. _With 94 illustrations_, 240 pages. Demy 8vo, cloth, 9_s._ CONTENTS: Introductory--Lamps or Burners Employing the Voltaic Arc--Electric “Candles” and Candle Lamps--Lighting by Incandescence--Magneto and Dynamo-electric Machines--Mechanical Efficiency of Electric Light Machines--Simple Mathematical Considerations Concerning Electric Lighting--Electric Regulators--Commercial Aspect of Electric Lighting--Division of the Electric Light--Maritime and Military Aspects--Various Applications of the Electric Light--Electric Carbons.