14 



DRYING BY MEANS OF AIR AND STEAM. Explana- 

 tions, Formulae, and Tables for Use in Practice. Translated from the 

 German of E. HAUSBRAND. Two folding Diagrams and Thirteen Tables. 

 Crown 8vo. 1901. 72 pp. Price 5s.; India and Colonies, 5s. 6d. ; 

 Other Countries, 6s. ; strictly net. 



Contents. 



Preface. British and Metric Systems Compared Centigrade and Fahr. Thermometers. 

 Chapters I., Introduction. II., Estimation of the Maximum Weight of Saturated Aqueous 

 Vapour which can be contained in 1 kilo, of Air at Different Pressure and Tempera- 

 tures. III., 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 |, J or J Saturated. C, When the Atmospheric Air is not 

 Saturated with Moisture before Entering the Drying Apparatus. IV., Drying Apparatus, in 

 which, in the Drying Chamber, a Pressure is Artificially Created, Higher or Lower than that 

 of the Atmosphere. V., Drying by Means of Superheated Steam, without Air. VI., Heating 

 Surface, Velocity of the Air Current, Dimensions of the Drying Room, Surface of the Drying 

 Material, Losses of Heat. Index. 



EVAPORATING, CONDENSING AND COOLING AP- 

 PARATUS. Explanations, Formulas and Tables for Use 

 in Practice. By E. HAUSBRAND, Engineer. Translated from the 

 Second Revised German Edition by A. C. WRIGHT, M.A. (Oxon.), 

 B.Sc. (Lond.), formerly Assistant Lecturer and Demonstrator in 

 Chemistry at the Yorkshire College, Leeds. With Twenty-one Illus- 

 trations and Seventy-six Tables. Demy 8vo. 1902. Price 10s. 6d. ; 

 India and Colonies, 11s. ; Other Countries, 12s. net. 

 Contents. 



Prefaces. List of Tables. Metric and British Systems and Thermometers compared. 

 Symbols and Contractions. Introduction. Chapters I., ^Coefficient of Transmission of 

 Heat, k/, and the Mean Temperature Difference, 0/m. II., Parallel and Opposite Currents. 

 III., Apparatus for Heating with Direct Fire. IV., The Injection of Saturated Steam. V., 

 Superheated Steam. VI., Evaporation by Means of Hot Liquids. VII., The Transference 

 of Heat in General, and Transference by means of Saturated Steam in Particular. VIII., 

 The Transference of Heat from Saturated Steam in Pipes (Coils) and Double Bottoms. 

 IX., Evaporation in a Vacuum. X., The Multiple-effect Evaporator. XL, Multiple-effect 

 Evaporators from which Extra Steam is Taken. XII., 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. XIII., The Relative Proportion of the Heating 

 Surfaces in the Elements of the Multiple Evaporator and their Actual Dimensions. XIV.. 

 The Pressure Exerted by Currents of Steam and Gas upon Floating Drops of Water. 

 XV., The Motion of Floating Drops of Water upon which Press Currents of Steam. XVI., 

 The Splashing of Evaporating Liquids. XVII., The Diameter of Pipes for Steam, Alcohol, 

 Vapour and Air. XVIII., The Diameter of Water Pipes. XIX., The Loss of Heat from 

 Apparatus and Pipes to the Surrounding Air, and Means for Preventing the Loss. XX., 

 Condensers. XXL, Heating Liquids by Means of Steam. XXII., The Cooling of Liquids. 

 XXIII., The Volumes to be Exhausted from Condensers by the Air-pumps. XXIV., A Few 

 Remarks on Air-pumps and the Vacua they Produce. XXV., The Volumetric Efficiency of 

 Air-pumps. XXVI., The Volumes of Air which must be Exhausted from a Vessel in order to 

 Reduce its Original Pressure to a Certain Lower Pressure. Index. 



Leather Trades. 



THE LEATHER WORKER'S MANUAL. Being a Com- 

 pendium of Practical Recipes and Working Formulae for Curriers, 

 Bootmakers, Leather Dressers, Blacking Manufacturers, Saddlers, 

 Fancy Leather Workers, and all Persons engaged in the Manipulation 

 of Leather. By H. C. STANDAGE. 165 pp. 1900. Price 7s. 6d. ; 

 India and Colonies, 8s. ; Other Countries, 8s. 6d. ; strictly net. 

 Contents. 



Chapters I., Blackings, Polishes, Glosses, Dressings, Renovators, etc., for Boot and Shoe 

 Leather. II., Harness Blackings, Dressings, Greases, Compositions, Soaps, and Boot-top 

 Powders and Liquids, etc., etc. III., Leather Grinders' Sundries. IV., Currier's Seasonings, 

 Blacking Compounds, Dressings, Finishes, Glosses, etc. V., Dyes and Stains for Leather. 

 VI., Miscellaneous Information. VII., Chrome Tannage. Index. 



Press Opinions. 



"The book being absolutely unique." Birmingham Gazette. 



" This is a valuable collection of practical receipts and working formulae for the use of those 

 engaged in the manipulation of leather." Liverpool Mercury. 



