20 D. VAN NOSTBAND COMPANY'S 



HENRICI, OLAUS. Skeleton Structures, Applied to 



the Building of Steel aiid Iron Bridges. 8vo, cl., Illustrated. . .$1.50 



HERRMANN, Gustav. The Graphical Statics of 



Mechanism. A Guide for the Use of Machinists, Architects, and 

 Engineers ; and also a Text-book for Technical Schools. Translated 

 and annotated by A. P. Smith, M. E. 12mo, cloth, 7 folding 

 plates. Fourth Edition $2.00 



HERMANN, FELIX. Painting on Glass and Porce- 

 lain and Enamel Painting. On the Basis of Personal Practical Ex- 

 perience of the Condition of the Art up to date. Translated by 

 Charles Salter. Second greatly enlarged edition. 8vo, cloth. 

 Illustrated net, $3.50 



HERZFELD, DR. J. The Technical Testing of Yarns 



and Textile Fabrics, with reference to official specifications. Trans- 

 lated by Chas. Salter. With 69 illustrations. 8vo, cloth, .net, $3.50 



HE WSON, WM. Principles and Practice of Embanking 



Lands from River Floods, as applied to the Levees of the Mississippi. 

 8vo, cloth $2.00 



HILL., JOHN W. The Purification of Public Water 



Supplies. Illustrated with valuable Tables, Diagrams and Cuts. 

 8vo, cloth, 304 pages $3.00 



Interpretation of Water Analysis, l^mo, cloth. 



In Press. 



HOBBS, W. R. P. The Arithmetic of Electrical Meas- 

 urements, with numerous examples, fully worked. Revised by 

 Richard Wormell, M. A. Ninth edition. 12mo, cloth $0.50 



HOFF, WM. B., Com. U. S. Navy. The Avoidance of 



Collisions at Sea. 18mo, morocco 75 



HOLLE Y, ALEXANDER L. Railway Practice. Ameri- 

 can and European Railway practice in the Economical Generation of 

 Steam, including the Materials and Construction of Coal-burning 

 Boilers, Combustion, the Variable Blast, Vaporization, Circulation, 

 Superheating, Supplying and Heating Feed Water, etc., and the 

 Adaptation of Wood and Coke-burning Engines to Coal-burning ; and 

 in Permanent Way, including Road-bed, Sleepers, Rails, Joint Fasten- 

 ings, Street Railways, etc. With 77 lithographed plates. Folio, 

 cloth $12.00 



HOLMES, A. BROMLEY. The Electric Light Popu- 

 larly Explained. Fifth Edition. Illustrated. 12mo, paper. . .$0.40 



HOPKINS, NEVTL M. Model Engines and Small 



Boats. New Methods of Engine and Boiler Making with a chapter on 

 Elementary Ship Design and Construction. 12mo, cloth $1.25 



HOSPITALIER, E. Polyphased Alternating Currents. 



Illustrated. 8vo, cloth $1.40 



