DRYING BY MEANS OF AIR AND STEAM. Explanations, FormulÆ, and Tables for Use in Practice. Translated from the German of E. Hausrrand. Two folding Diagrams and Thirteen Tables. Crown 8vo. 72 pp. Price 5s. net. (Post free, 5s. 3d. home; 5s. 6d. abroad.)

Contents.

British and Metric Systems Compared -- Centigrade and Fahr. Thermometers -- Estimation of the Maximum Weight of Saturated Aqueous Vapour which can be contained in 1 kilo. of Air at Different Pressure and Temperatures -- Calculation of the Necessary Weight and Volume of Air, and of the Least Expenditure of Heat, per Drying Apparatus with Heated Air, at the Atmospheric Pressure: A, With the Assumption that the Air is Completely Saturated with Vapour both before Entry and after Exit from the Apparatus -- B, When the Atmospheric Air is Completely Saturated before entry, but at its exit is only 3/4, 1/2 or 1/4 Saturated -- C, When the Atmospheric Air is not Saturated with Moisture before Entering the Drying Apparatus -- Drying Apparatus, in which, in the Drying Chamber, a Pressure is Artificially Created, Higher or Lower than that of the Atmosphere -- Drying by Means of Superheated Steam, without Air --Heating Surface, Velocity of the Air Current, Dimensions of the Drying Room, Surface of the Drying Material, Losses of Heat -- Index.

(See also "Evaporating, Condensing and Cooling Apparatus.")

PURE AIR, OZONE AND WATER. A Practical Treatise of their Utilisation and Value in Oil, Grease, Soap, Paint, Glue and other Industries, By W. B. Cowell. Twelve Illustrations. Crown 8vo. 85 pp. Price 5s. net. (Post free, 5s. 3d. home; 5s. 6d. abroad.)

Contents.

Atmospheric Air; Lifting of Liquids; Suction Process; Preparing Blown Oils; Preparing Siccative Drying Oils -- Compressed Air; Whitewash -- Liquid Air; Retrocession -- Purification of Water; Water Hardness -- Fleshings and Bones -- Ozonised Air in the Bleaching and Deodorising of Fats, Glues, etc.; Bleaching Textile Fibres -- Appendix: Air and Gases; Pressure of Air at Various Temperatures; Fuel; Table of Combustibles; Saving of Fuel by Heating Feed Water; Table of Solubilities of Scale Making Minerals; British Thermal Units Tables; Volume of the Flow of Steam into the Atmosphere; Temperature of Steam -- Index.

THE INDUSTRIAL USES OF WATER. COMPOSITION--EFFECTS--TROUBLES--REMEDIES--RESIDUARY WATERS--PURIFICATION--ANALYSIS. By H. de la Coux. Royal 8vo. Translated from the French and Revised by Arthur Morris. 364 pp. 135 Illustrations. Price 10s. 6d. net. (Post free, 11s. home; 11s. 6d. abroad.)

Contents.

Chemical Action of Water in Nature and in Industrial Use -- Composition of Waters -- Solubility of Certain Salts in Water Considered from the Industrial Point of View -- Effects on the Boiling of Water -- Effects of Water in the Industries -- Difficulties with Water -- Feed Water for Boilers -- Water in Dye works, Print Works, and Bleach Works -- Water in the Textile Industries and in Conditioning -- Water in Soap Works -- Water in Laundries and Washhouses -- Water in Tanning -- Water in Preparing Tannin and Dyewood Extracts -- Water in Papermaking -- Water in Photography -- Water in Sugar Refining -- Water in Making Ices and Beverages -- Water in Cider Making -- Water in Brewing -- Water in Distilling -- Preliminary Treatment and Apparatus -- Substances Used for Preliminary Chemical Purification -- Commercial Specialities and their Employment -- Precipitation of Matters in Suspension in Water -- Apparatus for the Preliminary Chemical Purification of Water -- Industrial Filters -- Industrial Sterilisation of Water -- Residuary Waters and their Purification -- Soil Filtration -- Purification by Chemical Processes -- Analyses -- Index.

(See Books on Smoke Prevention, Engineering and Metallurgy etc.)