Editor-In-Chief

HOWARD MONROE RAYMOND, B. S.

Dean, Armour Institute of Technology.

Associate Editors

CHARLES L. GRIFFIN, S. B.

Mechanical Engineer. Semet-Solvay Co.. American Society of Mechanical Engineers.

EDWARD R. MARKHAM

Instructor in Machine Shop Work. Rindge Manual Training School, formerly Supt. Waltham Watch Tool Co.

CLARENCE E. FREEMAN, M. S., E. E.

Professor of Electrical Engineering, Armour Institute of Technology, American Institute of Electrical Engineers.

ALFRED E. ZAPF, S. B.

Secretary, American School of Correspondence.

JAMES RITCHEY

Instructor in Pattern Making, Armour Institute of Technology.

WALTER H. JAMES, S. B.

Instructor in Mechanical Drawing, Mas-sachussetts Institute of Technology.

CARL S. DOW, S. B.

Editor Text-book Department, American School of Correspondence, American Society Mechanical Engineers.

ERVIN KENISON, S. B.

Instructor In Mechanical Drawing, Massachusetts Institute of Technology.

GEORGE FREDERICK GEB-HARDT, M. A., M. E.

Professor of Mechanical Engineering, Armour Institute of Technology.

FREDERICK W. TURNER Formerly Instructor in Machine Shop Work. Rindge Manual Training School.

R. T. MILLER, Jr., A. M., LL. B.

President, American School of Correspondence.

EDWARD B. WAITE

Instructor in Mechanical Engineering. American Society Mechanical Engineers.

RALPH H. SWEETSER, S. B.

Manager Cranberry Furnace Co., American Institute Mining Engineers, formerly Instructor Mass. Institute of Technology.

ROBERT VALLETTE PERRY, B. S.

M. E.

Associate Professor of Machine Design, Armour Institute of Technology.

WILLIAM S. NEWELL, S. B.

Bath Iron Works. Formerly Instructor Massachusetts Institute of Technology.

MAURICE LcBOSQUET, S. B.

British Society of Chemical Industry, American Chemical Society.

F. B. CROCKER, E. M., Ph. D.

Head of Dept. of Electrical Engineering, Columbia University. Past President American Institute Electrical Engineers.

GEORGE L. FOWLER, A. B., M. E.

Consulting Engineer, American Society Mechanical Engineers, American Railway Master Mechanics' Association, etc.

JAMES R. CRAVATH, Western Editor, "Street Railway Journal".

RAYMOND BURNHAM, M. E.

Associate Professor of Experimental Engineering, Armour Institute of Technology.

LEON H. RITTENHOUSE, M. E.

Instructor in Mechanical Engineering, American School of Correspondence.

EDWARD D. AGLE

Superintendent of Shops and Instructor in Machine Tool Work, Armour Institute of Technology.

ERNEST L. WALLACE, B. S.

Instructor in Electrical Engineering, American School of Correspondence.

WILLIAM T. HOWELL

Instructor in Founding, Armour Institute of Technology.

HARRIS C. TROW, S. B.

Instructor in Electrical Engineering. American School of Correspondence, American Institute Electrical Engineers.

LOUIS DERR, S. B., A. M.

Associate Professor of Physics, Massachusetts Institute of Technology.

JOHN E. SNOW, M. S., E. E.

Associate Professor of Electrical Engineering, Armour Institute of Technology, American Institute of Electrical Engineers.

WALTER B. SNOW, S. B.

Mechanical Engineer. B. F. Sturtevant Co., American Society Mechanical Engineers.

LAWRENCE K. SAGER, S. B.

Assistant Examiner, U. S. Patent Office, formerly Instructor in Electrical Engineering, American School of Correspondence.

HELON BROOKS MacFARLAND, B. S., M. M. E.

Associate Professor of Mechanics, Armour Institute of Technology. .

LAWRENCE S. SMITH,.S. B.

Instructor in Mechanical Engineering, Massachusetts Institute of Technology.

HARRY C. COFFEEN, M. S.

Assistant Professor of Machine Design, Armour Institute of Technology.

EDGAR R. CREAMER

Instructor in Forging, Armour Institute of Technology.

L. ALLEN SOMMER

Instructor in Machine Tool Work. Armour Institute of Technology.

WILLIAM NEUBECKER

Instructor, Sheet Metal Department of N. Y. Trade School, formerly Superintendent Foerster Co.

H. C. CUSHING, JR.

Consulting Electrical Engineer. Author of "Standard Wiring for Electric Light and Power".

CHARLES DICKERMAN, Refrigerating Engineer, Pennsylvania Iron Works Co.

Authorities Consulted

In the preparation of these volumes the editors have received invaluable assistance from the foremosl engineering firms and manufacturers. Grateful acknowledgment is here made for the valuable drawings, data, suggestions and criticisms which have enabled the editors to make these volumes representative of the latest and best practice in Mechanical Drawing and the Design and Construction of Machinery and Machine Tools.

The standard technical literature of Europe and America has been freely consulted in the preparation of these volumes. The editors desire to express their indebtedness, particularly to the following eminent authorities, whose well-known treatises should be in the library of every Mechanic and Engineer.

ELROY MeKENDRTE AVERY, Ph. D., LL. D.

Author of Elementary Physics, Elements of Natural Philosophy. Physical Technics. Teacher's Handbook of Chemistry, Complete Chemistry. First Principles or Nat ural Philosophy, School Phyales, Elemen tary Physics, First Lessons in Physical Science, School Chemistry.

GEORGE FREDERICK BARKER, M. D., Hod. Sc. D., LL. D.

Emeritus Professor or Physics, Unlver sity of Pennsylvania; Member. National Academy Science; Late President. American Academy and Sciences; American Chemical Society.

Author of Textbooks of Elementary Chemistry. Physics, etc.

WILLIAM M. BARR Member, American Society Mechunical Engineers Author of Hollers and Furnaces, PumpIng Machinery, Chimneys of Brlck and Metal, etc.

ALFRED WILLIAM BEVIS

Whit worth Scholar M. I.Meeh. E.: Dlrec-lor of Manual Training to the Birmingham School Board.