SCIENTIFIC PUBLICATIONS. 47 



WABNER, ROBERT. Ventilation in Mines. Trans- 

 lated from the Qermau by Charles Salter. With plates and engrav- 

 ings. 8vo, cloth, illustrated, 240 pages net. $4.50 



WADE, E. J. Second Batteries: Their Theory, Con- 

 struction and Use. With innumerable diagrams and figures. 8vo, 

 cloth, illustrated, 492 pages net. $4.00 



WALKER, FREDERICK C. E. Aerial Navigation: 

 A Practical Hand-book on the Construction of Dirigible Balloons, 

 Aerostats, Aeroplanes and Aeromotors. With diagrams, tables and 

 illustrations. 8vo, cloth, illustrated, 151 pages net. $3.00 



WALKER, W. H. Screw Propulsion. Notes on Screw 



Propulsion, its Rise and History. 8vo, cloth 75 



WALKER, SYDNEY F. Electrical Engineering in 



Our Homes and Workshops. A Practical Treatise on Auxiliary Elec- 

 trical Apparatus. Third edition, revised, with numerous illustra- 

 tions $2.00 



- Electric Lighting for Marine Engineers, or How to 



Light a Ship by the Electric Light and How to Keep the Apparatus 

 in Order. 103 illustrations. 8vo, cloth. Second edition $2.00 



WALLING, B. T., (Lieut. Com. TJ. S. N.), and Julius 



Martin. Electrical Installations of the United States Navy. With 

 many diagrams and engravings. 8vo, cloth, illustrated. . . . . In Press. 



WALLIS-TAYLER, A. J. Modern Cycles, A Practi- 

 cal Handbook on Their Construction and Repair. With 300 illustra- 

 tions. 8vo, cloth $4.00 



Motor Cars, or Power Carriages for Common 



Roads. With numerous illustrations. 8vo, cloth $1.80 



Bearings and Lubrication. A Handbook for every 



user of Machinery. Fully illustrated. 8vo, cloth $1.50 



Refrigerating and Ice-Making Machinery. A 



Descriptive Treatise for the use of persons employing refrigerating 

 and ice- making installations and others. 8vo, cloth, illustrated.. $3. 00 



Refrigeration and Cold Storage ; being a complete 



practical treatise on the art and science of refrigeration. 600 pp., 

 361 diagrams and figures. 8vo, cloth, illustrated net, $4.50 



Sugar Machinery. A Descriptive Treatise, devoted 



to the Machinery and Apparatus used in the Manufacture of Cane 

 and Beet Sugars. 12mo, cloth, ill $2.00 



WANKLYN, J. A. A Practical Treatise on the Exam- 

 ination of Milk and its Derivatives, Cream, Batter, and Cheaae. 

 12mo, cloth $1.00 



Water Analysis. A Practical Treatise on the Ex- 

 amination of Potable Water. 7V nt/i fdifion. 12mo, cloth $2.00 



