Winchell, N. H., and A. N. Elements of Optical Mineralogy....... .8vo, Wisser, Lieut. J. P. Modern Gun Cotton. (Science Series No. 89.)16m0, *3 50 4 00 0 50 0 50 0 50 0 50 4 00 Worden, E. C. The Nitrocellulose Industry. Two Volumes.... 8vo, *10 00 Cellulose Acetate..... Wright, A. C. Analysis of Oils and Allied Substances.. Simple Method for Testing Painters' Materials.. .8vo, (In Press.) .8vo, *3 50 .8vo, *2 50 Wright, J. Testing, Fault Finding, etc., for Wiremen. Manuals Series.)...... Wright, T. W. Elements of Mechanics.. 8vo, *2 50 Wright, T. W., and Hayford, J. F. Adjustment of Observations.....8vo, *3 00 Young, J. E. Electrical Testing for Telegraph Engineers.... Zahner, R. Transmission of Power. (Science Series No. 40.)....16m0, Zeidler, J., and Lustgarten, J. Electric Arc Lamps.... .8vo, *2 00 Zeuner, A. Technical Thermodynamics. Trans. by J. F. Klein. Two Volumes.... .8vo, *8 00 Zimmer, G. F. Mechanical Handling of Material. .4to, *10 00 .8vo, *5 00 Zur Nedden, F. Engineering Workshop Machines and Processes. by J. A. Davenport...... Trans. ..8vo #2 00 D. VAN NOSTRAND COMPANY are prepared to supply, either from Any Technical or In addition to publishing a very large All inquiries are cheerfully and care- |