THE PREVENTION OF SMOKE. Combined with the Economical Combustion of Fuel. By W. C. Popplewell, M.Sc., A.M. Inst., C.E., Consulting Engineer. Forty-six Illustrations. 190 pp. Demy 8vo. Price 7s. 6d. net. (Post free, 7s. 10d. home; 8s. 3d. abroad.)

Contents.

Fuel and Combustion -- Hand Firing in Boiler Furnaces -- Stoking by Mechanical Means -- Powdered Fuel -- Gaseous Fuel -- Efficiency and Smoke Tests of Boilers -- Some Standard Smoke Trials -- The Legal Aspect of the Smoke Question -- The Best Means to be adopted for the Prevention of Smoke -- Index.

GAS AND COAL DUST FIRING. A Critical Review of the Various Appliances Patented in Germany for this purpose since 1885. By Albert PÜtsch. 130 pp. Demy 8vo. Translated from the German. With 103 Illustrations. Price 7s. 6d. net. (Post free, 7s. 10d. home; 8s. abroad.)

Contents.

Generators -- Generators Employing Steam -- Stirring and Feed Regulating Appliances -- Direct Generators -- Burners -- Regenerators and Recuperators -- Glass Smelting Furnaces -- Metallurgical Furnaces -- Pottery Furnace -- Coal Dust Firing -- Index.

THE HARDENING AND TEMPERING OF STEEL IN THEORY AND PRACTICE. By Fridolin Reiser. Translated from the German of the Third Edition. Crown 8vo. 120 pp. Price 5s. net. (Post free, 5s. 3d. home; 5s. 4d. abroad.)

Contents.

Steel -- Chemical and Physical Properties of Steel, and their Casual Connection -- Classification of Steel according to Use -- Testing the Quality of Steel -- Steel-Hardening -- Investigation of the Causes of Failure in Hardening -- Regeneration of Steel Spoilt in the Furnace -- Welding Steel -- Index.

SIDEROLOGY: THE SCIENCE OF IRON (The Constitution of Iron Alloys and Slags). Translated from German of Hanns Freiherr v. JÜptner. 350 pp. Demy 8vo. Eleven Plates and Ten Illustrations. Price 10s. 6d. net. (Post free, 11s. home; 11s. 6d. abroad.)

Contents.

The Theory of Solution. -- Solutions -- Molten Alloys -- Varieties of Solutions -- Osmotic Pressure -- Relation between Osmotic Pressure and other Properties of Solutions -- Osmotic Pressure and Molecular Weight of the Dissolved Substance -- Solutions of Gases -- Solid Solutions -- Solubility -- Diffusion -- Electrical Conductivity -- Constitution of Electrolytes and Metals -- Thermal Expansion. Micrography. -- Microstructure -- The Micrographic Constituents of Iron -- Relation between Micrographical Composition, Carbon-Content, and Thermal Treatment of Iron Alloys -- The Microstructure of Slags. Chemical Composition of the Alloys of Iron. -- Constituents of Iron Alloys -- Carbon -- Constituents of the Iron Alloys, Carbon -- Opinions and Researches on Combined Carbon -- Applying the Curves of Solution deduced from the Curves of Recalescence to the Determination of the Chemical Composition of the Carbon present in Iron Alloys -- The Constituents of Iron -- Iron -- The Constituents of Iron Alloys -- Manganese -- Remaining Constituents of Iron Alloys -- A Silicon -- Gases. The Chemical Composition of Slag. -- Silicate Slags -- Calculating the Composition of Silicate Slags -- Phosphate Slags -- Oxide Slags -- Appendix -- Index.

EVAPORATING, CONDENSING AND COOLING APPARATUS. Explanations, FormulÆ and Tables for Use in Practice. By E. Hausbrand, Engineer. Translated by A. C. Wright, M.A. (Oxon.), B.Sc. (Lond.). With Twenty-one Illustrations and Seventy-six Tables. 400 pp. Demy 8vo. Price 10s. 6d. net. (Post free, 11s. home; 11s. 6d. abroad.)

Contents of "Evaporating, Condensing: and Cooling-Apparatus".<7p>

ReCoefficient of Transmission of Heat, k/, and the Mean Temperature Difference, [**Greek: th θ]/m -- Parallel and Opposite Currents -- Apparatus for Heating with Direct Fire -- The Injection of Saturated Steam -- Superheated Steam -- Evaporation by Means of Hot Liquids -- The Transference of Heat in General, and Transference by means of Saturated Steam in Particular -- The Transference of Heat from Saturated Steam in Pipes (Coils) and Double Bottoms -- Evaporation in a Vacuum -- The Multiple-effect Evaporator -- Multiple-effect Evaporators from which Extra Steam is Taken -- The Weight of Water which must be Evaporated from 100 Kilos, of Liquor in order its Original Percentage of Dry Materials from 1-25 per cent. up to 20-70 per cent. -- The Relative Proportion of the Heating Surfaces in the Elements of the Multiple Evaporator and their Actual Dimensions -- The Pressure Exerted by Currents of Steam and Gas upon Floating Drops of Water -- The Motion of Floating Drops of Water upon which Press Currents of Steam -- The Splashing of Evaporating Liquids -- The Diameter of Pipes for Steam, Alcohol, Vapour and Air -- The Diameter of Water Pipes -- The Loss of Heat, from Apparatus and Pipes to the Surrounding Air, and Means for Preventing the Loss -- Condensers -- Heating Liquids by Means of Steam -- The Cooling of Liquids -- The Volumes to be Exhausted from Condensers by the Air-pumps -- A Few Remarks on Air-pumps and the Vacua they Produce -- The Volumetric Efficiency of Air-pumps -- The Volumes of Air which must be Exhausted from a Vessel in order to Reduce its Original Pressure to a Certain Lower Pressure -- Index.