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VAN DER LINGEN, J. STEPHEN, Lecturer, Department of Applied Mathematics, University of Cape Town, Cape Town, South Africa.

VAN DEVENTER, CHRISTOPHER, Consulting Engineer, 438 First National Bank Building, Chicago, Illinois.

VAN DEVENTER, H. R., Engineer and Patent Attorney, Bureau Patent Development, Westinghouse Electric and Manufacturing Company, East Pittsburgh, Pennsylvania. VAN DYKE, J. W., President, The Atlantic Refining Company, and for mail, The Wellington, Philadelphia, Pennsylvania.

VAN TRUMP, S. N., Civil Engineer, Water Department, Wilmington, Delaware.
VAUCLAIN, S. M., President, The Baldwin Locomotive Works, 500 North Broad Street, Phila-
delphia, Pennsylvania.

VAUGHAN, H. H., Engineer, 20 MacGregor Street, Montreal, Quebec, Canada.
VAUGHEN, F. G., Manager, Meter Department, General Electric Company, Schenectady,
New York.

VAUX, GEORGE, JR., Attorney-at-Law, Gulf Road, Bryn Mawr, Pennsylvania.
VEEDER, CURTIS H., Manufacturer, Veeder Manufacturing Company, Hartford, Connecticut.
VIALL, ETHAN, 7474 Lower River Road, Fernbank, Cincinnati, Ohio.

VOGLESON, JOHN A., Civil Engineer, 8009 Crefeldt Street, Philadelphia, Pennsylvania.
VREELAND, FREDERICK R., Research Engineer, 90 West Street, New York City, New York.
WADDELL, J. A. L., Consulting Engineer, 35 Nassau Street, New York City, New York.
WADLEIGH, F. R., Fuel Division, Bureau of Foreign and Domestic Commerce, Department of
Commerce, Washington, D. C.

WADSWORTH, F. L. O., Consulting and Advisory Engineer, P. O. Box 268, East Liberty Station, Pittsburgh, Pennsylvania.

WAGNER, FRED H., Chief Engineer, The Bartlett Hayward Company, and for mail, Lombardy Apartments, 39th Street and Stony Run Lane, Baltimore, Maryland.

WAGNER, HERBERT A., President, Consolidated Gas Electric Light and Power Company, Lexington and Liberty Streets, Baltimore, Maryland.

WAGNER, SAMUEL T., Chief Engineer, Philadelphia and Reading Railway Company, and for mail, School House Lane, Germantown, Philadelphia, Pennsylvania.

WALDRON, WILLIAM H., Manufacturer of Machinery, John Waldron Company, New Brunswick, New Jersey.

WALKER, J. W., Manufacturer, Address unknown.

WALLER, ALFRED E., Electrical Engineer, Lawrence Park, Bronxville, New York.
WALLERSTEIN, LEO, Chemist, 171 Madison Avenue, New York City, New York.

WALLIS, J. T., Chief of Motive Power, Pennsylvania System, Broad Street Station, Philadelphia,
Pennsylvania.

WALTON, HORACE, Insurance, 416-420 Walnut Street, Philadelphia, Pennsylvania.
WANAMAKER, JOHN, Merchant, 1300 Market Street, Philadelphia, Pennsylvania.
WARD, ALGER L., Chemist, 1962 Spencer Street, Philadelphia, Pennsylvania.
WARDEN, WILLIAM G., 1012 Witherspoon Building, Philadelphia, Pennsylvania.
WARNER, WM. R., JR., (Retired), Duffryn Mawr, Chester County, Pennsylvania.
WARNOCK, JAMES, JR., Bookkeeper, 333 Chestnut Street, Philadelphia, Pennsylvania.
WARRINER, S. D., President, Lehigh Coal and Navigation Company, 437 Chestnut Street,
Philadelphia, Pennsylvania.

WARWICK, J. F., Electrical Engineer, 61 Crew Street, Atlanta, Georgia.

WATSON, JAMES, Steam Specialty Manufacturer, 146 North Seventh Street, Philadelphia, Pennsylvania.

WEBSTER, ALBERT L., Consulting Sanitary Engineer, 112 E. 40th Street, New York City, New York.

WEBSTER, GEORGE S., Civil Engineer, 4900 Penn Street, Frankford, Philadelphia, Penn

sylvania.

WEBSTER, WM. R., Consulting and Inspecting Engineer, 413 Walnut Street, Philadelphia, Pennsylvania.

WEDGE, UTLEY, Engineer, Sulphuric Acid Expert, Ardmore, Pennsylvania.

WEEKS, EDWIN R., Consulting Engineer, 604-6 New Nelson Building, Kansas City, Missouri. WEIDLEIN, EDWARD R., Chemical Engineer, Director of Mellon Institute of Industrial Research, Pittsburgh, Pennsylvania.

WEINBERG, SOLOMON, Chemical Engineer, Sunderland House, 35th Street and Powelton Avenue, Philadelphia, Pennsylvania.

WEISS, J. M., Manager, Research Department, The Barrett Company, 40 Rector Street, New York City, New York.

WELLS, G. A., 11 West 8th Street, New York City, New York.

WELLS, W. F., Vice President, Edison Electric Illuminating Company, 360 Pearl Street, Brooklyn, New York

WELSH, FRANCIS RALSTON, Investments, Devon, Pennsylvania.

WELTZ, EARL H., Chemist, E. I. du Pont de Nemours & Company, 122 Broadway, Carney's Point, New Jersey.

WESTON, Dr. EDWARD, President, Weston Electrical Instrument Company, Waverly Park, Newark, New Jersey.

WESTON, F. W., Manufacturer, Wynnewood, Pennsylvania.

WETHERILL, ROBERT, Engine and Machine Work Manufacturer, Chester, Pennsylvania. WETHERILL, S. P., Manufacturer, Room 600, Morris Building, 1421 Chestnut Street, Philadelphia, Pennsylvania.

WETHERILL, W. CHATTIN, Department of Mechanical Engineering, University of Pennsylvania, Philadelphia, Pennsylvania.

WEYL, CHARLES N., 6506 Lincoln Drive, Germantown, Philadelphia, Pennsylvania.
WHARTON, HENRY, Chestnut Hill, Philadelphia, Pennsylvania.

WHITAKER, JAMES L., Cotton Manufacturer, Cedar Grove, Olney, Philadelphia, Pennsylvania.

WHITE, J. ATWOOD, Paper Machinery Manufacturer, 15th Street and Lehigh Avenue, Philadelphia, Pennsylvania.

WHITE, W. M., Hydraulic Engineer, Allis-Chalmers Manufacturing Company, Milwaukee, Wisconsin.

WHITNEY, ASA W., Metallurgist, in care of Enterprise Foundry and Machine Works, Bristol, Tennessee.

WHITNEY,

CHARLES H., Whitney-Mac Donald Company, Tioga and Memphis Streets, Philadelphia, Pennsylvania.

WHITNEY, E. R., President, Commercial Truck Company, Hunting Park and Rising Sun Avenue, Philadelphia, Pennsylvania.

WHITNEY, FRANK E., Mechanical Engineer, Commercial Truck Company, Hunting Park and Rising Sun Avenues, Philadelphia, Pennsylvania.

WHITNEY, LOUIS B., Manager, Alpha Portland Cement Company, 428 Oliver Building, Pittsburgh, Pennsylvania.

WHYTE, F. M., Vice President, Hutchins Car Roofing Company, New York City, and for mail, 14 Benedict Avenue, Tarrytown, New York.

WIDDICOMBE, Major R. A., Engineer, 4639 Beacon Street, Chicago, Illinois.

WIEDERSHEIM, J. A., Patent Attorney and Mechanical Expert, 1232 Chestnut Street, Philadelphia, Pennsylvania.

WIEGAND, JOHN, Salesman, 2020 North Marshall Street, Philadelphia, Pennsylvania.
WILBUR, W. A., Banker, South Bethlehem, Pennsylvania.

WILEY, Dr. H. W., Chemist, Room 1120, Woodward Building, Washington, D. C.

WILKIN, JOHN T., President and Engineer, The Connersville Blower Company, and for mail, 905 Grand Avenue, Connersville, Indiana.

WILLCOX, JAMES M., Wawa, Delaware County, Pennsylvania.

WILLCOX, W. F., Darling Post Office, Delaware County, Pennsylvania.

WILLE, H. V., Assistant, Vice President, The Baldwin Locomotive Works, 500 North Broad Street, Philadelphia, Pennsylvania.

WILLIAMS, E. D., Attorney-at-Law, 560 Drexel Building, Philadelphia, Pennsylvania. WILLIAMS, HENRY S., President, Williams, Brown and Earle, Incorporated, 918 Chestnut Street, Philadelphia, Pennsylvania.

WILLIAMS, IRA JEWELL, Attorney-at-Law, 1005 Morris Building, 1421 Chestnut Street, Philadelphia, Pennsylvania.

WILLIAMS, Dr. WILLIAM J., Chemist, 1503 Foulkrod Street, Frankford, Philadelphia, Pennsylvania.

WILLIAMSON, J. D., JR., Vice President, American Engineering Company, Latham Park, Oak Lane P. O., Philadelphia, Pennsylvania.

WILSON, ARTHUR M., General Insurance, 706 Stock Exchange Building, Philadelphia,
Pennsylvania.

WILSON, DAVID H., Student, 640 North 32nd Street, Philadelphia, Pennsylvania.
WILSON, H. A., Coronado Apartments, 22nd and Chestnut Streets, Philadelphia, Pennsylvania.
WILSON, H. D., Coronado Apartments, 22nd and Chestnut Streets, Philadelphia, Penn-
sylvania.

WILSON, HENRY W., Civil Engineer, 909 Clinton Street, Philadelphia, Pennsylvania.

WILSON, J., CLIFFORD, President and Treasurer, J. S. Wilson and Son, Incorporated, Room 205, 1509 Arch Street, Philadelphia, Pennsylvania.

WILSON, J. HUNT, Professor of Chemistry, Lafayette College, 531 Cattell Street, Easton, Pennsylvania.

WILSON, J. L., 608 Chestnut Street, Philadelphia, Pennsylvania.

WILSON, JOHN S., Inspector, 124 South Eutaw Street, Baltimore, Maryland.

WIRT, CHARLES, President and Engineer, Wirt Company, and for mail, 508 East Washington Lane, Germantown, Philadelphia, Pennsylvania.

WOLF, JOHN JACOB, 927 North Fifth Street, Philadelphia, Pennsylvania.

WOOD, ALAN, 3rd, Mechanical Engineer, Flat Rock, North Carolina.

WOOD, ALBERT C., Consulting Mechanical Engineer, Stock Exchange Building, Philadelphia, Pennsylvania.

WOOD, BIDDLE, Iron Manufacturer, Conshohocken, Pennsylvania.

WOOD, E. R., JR., Mechanical Engineer, 409 Chestnut Street, Philadelphia, Pennsylvania. WOOD, F. W., President, Maryland Steel Company, and for mail, Keyworth Avenue, Baltimore, Maryland.

WOOD, ROBERT L., Civil Engineer, Cruse-Kemper Company, Main Street, Ambler, Pennsylvania.

WOOD, WALTER, Manufacturer, 400 Chestnut Street, Philadelphia, Pennsylvania.

WOODBRIDGE, J. LESTER, Electrical Engineer, 19th Street and Allegheny Avenue, Philadelphia, Pennsylvania.

WOODBURY, C. A., Director, Eastern Laboratory, E. I. du Pont de Nemours Company. Drawer 424, Chester, Pennsylvania.

WOODHOUSE, HENRY, Editor, Foster Building, Madison Avenue and 40th Street, New York City, New York.

WOODROFFE, G. H., Mechanical and Metallurgical Engineer, Parkesburg, Chester County, Pennsylvania.

WOODWARD, GEORGE, Physician, 708 North American Building, Philadelphia, Pennsylvania. WOOLMAN, EDWARD, Mechanical Engineer, N. W. cor. Buck and Panmure Roads, Haverford, Pennsylvania.

WORRELL, HOWARD SELLERS, Engineer, 100 East Montgomery Avenue, Ardmore, Penn

sylvania.

WRIGHT, FRANK L., Factory Metallurgist, Atlas Ball Company, 4th Street and Glenwood Avenue, Philadelphia, Pennsylvania.

WRIGHT, JAMES A., Wright-Fisher Engineering Company, 600 McGill Building, Montreal, Quebec, Canada.

WRIGHT, ORVILLE, Aeronautical Research Engineer, 15 North Broadway, Dayton, Ohio. WRIGHT, ROY V., Editor, 398 North Walnut Street, East Orange, New Jersey.

WRIGHT, WINTHROP R., Professor of Physics, Swarthmore College, and for mail, 4 Whittier Place, Swarthmore, Pennsylvania.

WYATT, JAMES H., Electrical Engineer, Cutter Electric and Manufacturing Company, 19th and Hamilton Streets, Philadelphia, Pennsylvania.

YARNALL, D. ROBERT, Mechanical Engineer, Chestnut Hill, Philadelphia, Pennsylvania. YEOMANS, LUCIEN I., Industrial Engineer, Vice President, Amalgamated Machinery Corporation, 1327-53 West Jackson Street, Chicago, Illinois.

YORK, H. W., Consulting Engineer, 120 Broadway, New York City, New York.

YORKE, GEORGE M., Engineer, 70 Irving Place, New York City, New York.

YOUNG, J. BERTRAM, Chemist, Philadelphia and Reading Railway Company, Reading, Pennsylvania.

ZEHNDER, CHARLES H., Coal and Iron Merchant, Room 1648, 120 Broadway, New York City, New York.

ZILEN, VICTOR W., Mechanical Engineer, Route No. 1, Box 139, Chattanooga, Tennessee. ZIMMERMANN, JOHN E., Mechanical Engineer, Member of Firm, Day and Zimmermann, 611 Chestnut Street, Philadelphia, Pennsylvania.

MEMBERS WHOSE ADDRESSES ARE UNKNOWN.

ANDERSON, GEORGE L. (Honorary)

BYRD, JOHN

HALE, HENRY S.

PEMBERTON, HENRY R.

RUMFORD, WILLIAM C.

STEWART, FRANK H.

TAYLOR, LOWNDES

WALKER, J. W.

PETROLEUM By SIR BOVERTON REDWOOD, Bart. New Edition.
Revised and Reset. Just Published. In Three Volumes with Plates,
Numerous Illustrations in the Text and many New Maps Especially
Prepared for this Edition. 1353 Pages.

INDUSTRIAL ORGANIC CHEMISTRY By SAMUEL P. SADtler, Ph.D.,
LL.D. and LOUIS J. Matos, Ph. D. Fifth Edition. Revised, and largely
rewritten. Since the publication of the first edition, this has been the
standard handbook for the use of manufacturers, chemists and all inter-
ested in the utilization of organic materials in the industrial arts.
AUTOMATIC PUMPING By W. Walker FyFE. Numerous Illustrations,
Diagrams and Tables with Notes on Water Analysis and Filtration.
Just Published.

A TEXT-BOOK OF INORGANIC CHEMISTRY Volume IX, Part Two.
Iron. By J. NEWTON FRIEND, D.Sc., Ph.D., F.I.C. Frontispiece
and 8 Illustrations.
ELEMENTARY TEXT-BOOK OF METALLURGY By A. H. SEXTON,
F.I.C. New Edition. Revised and Greatly Enlarged. 70 Illustrations.
COKE-OVEN AND BY-PRODUCT WORKS CHEMISTRY BY THOMAS
BIDDULPH-SMITH. 62 Illustrations and 7 Folding Plates. 196 Pages.
SOME MICROCHEMICAL TESTS FOR ALKALOIDS BY CHARLES H.
STEPHENSON. Illustrated with 27 Plates including 162 Photomicro-
graphs of Tests.

RECOVERY OF NITRATE FROM CHILEAN CALICHE By A. W.
ALLEN, M.A.

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ANIMAL AND VEGETALE FIXED OILS, FATS, BUTTERS AND
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New Edition, Revised and Enlarged.

THE CLAYWORKER'S HANDBOOK By ALFRED B. SEARLE. 32 Illus-
trations. New Edition. Revised and Rewritten.
CYANIDING GOLD AND SILVER ORES By H. F. JULIAN and
EDGAR SMART. Numerous Illustrations, Plates and Maps. New
Edition. Revised.

RUNNING AND MAINTENANCE OF THE MARINE DIESEL EN-
GINE BY JOHN LAMB. Frontispiece, Plates and 106 Illustrations.
New Edition. Revised.

16.50

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QUESTIONS AND ANSWERS RELATING TO DIESEL, SEMI-
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OIL FUEL BY EDWARD BUTLER. Numerous Illustrations. New Edition.
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PETROLEUM REFINING BY ANDREW CAMPBELL. Illustrated. New
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