Authorities Consulted

The editors have freely consulted the standard technical literature of America and Europe in the preparation of these volumes. They desire to express their indebtedness particularly to the following eminent authorities, whose well-known works should be in the library of every telephone and telegraph engineer.

Grateful acknowledgment is here made also for the invaluable co-operation of the foremost engineering firms and manufacturers in making these volumes thoroughly representative of the very best and latest practice in the transmission of intelligence, also for the valuable drawings, data, suggestions, criticisms, and other courtesies.

ARTHUR E. KENNELY, D.Sc.

Professor of Electrical Engineering, Harvard University. Joint Author of "The Electric Telephone." "The Electric Telegraph," "Alternating Currents," "Arc Lighting," "Electric Heating," "Electric Motors," "Electric Railways," "Incandescent Lighting," etc.

HENRY SMITH CARHART, A.M., LL.D.

Professor of Physics and Director of the Physical Laboratory, University of Michigan. Author of "Primary Batteries," "Elements of Physics," "University Physics," "Electrical Measurements," "High School Physics," etc.

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

Head of Department of Electrical Engineering, Columbia University, New York; Past-President, American Institute of Electrical Engineers. Author of "Electric Lighting;" Joint Author of "Management of Electrical Machinery."

HORATIO A. FOSTER

Consulting Engineer; Member of American Institute of Electrical Engineers; Member of American Society of Mechanical Engineers. Author of "Electrical Engineer's Pocket-Book."

WILLIAM S. FRANKLIN, M.S., D.Sc.

Professor of Physics, Lehigh University. Joint Author of "The Elements of Electrical Engineering," "The Elements of Alternating Currents."

LAMAR LYNDON, B.E., M.E.

Consulting Electrical Engineer; Associate Member of American Institute of Electrical Engineers; Member, American Electro-Chemical Society. Author of "Storage Battery Engineering."

ROBERT ANDREWS MILLIKAN, Ph.D.

Professor of Physics, University of Chicago. Joint Author of "A First Course in Physics," "Electricity, Sound and Light," etc.

KEMPSTER B. MILLER, M.E.

Consulting Engineer and Telephone Expert; of the Firm of McMeen and Miller, Electrical Engineers and Patent Experts, Chicago. Author of "American Telephone Practice."

WILLIAM H. PREECE

Chief of the British Postal Telegraph. Joint Author of "Telegraphy," "A Manual of Telephony," etc.—

LOUIS BELL, Ph.D.

Consulting Electrical Engineer; Lecturer on Power Transmission, Massachusetts Institute of Technology. Author of "Electric Power Transmission," "Power Distribution for Electric Railways," "The Art of Illumination," "Wireless Telephony," etc.

OLIVER HEAVISIDE, F.R.S.

Author of "Electro-Magnetic Theory," "Electrical Papers," etc.

SILVANUS P. THOMPSON, D.Sc, B.A., F.R.S., F.R.A.S.

Principal and Professor of Physics in the City and Guilds of London Technical College. Author of "Electricity and Magnetism," "Dynamo-Electric Machinery," "Polyphase Electric Currents and Alternate-Current Motors," "The Electromagnet," etc.

ANDREW GRAY, M.A., F.R.S.E.

Author of "Absolute Measurements in Electricity and Magnetism."

ALBERT CUSHING CREHORE, A.B., Ph.D.

Electrical Engineer; Assistant Professor of Physics, Dartmouth College; Formerly instructor in Physics, Cornell University. Author of "Synchronous and Other Multiple Telegraphs;" Joint Author of "Alternating Currents."

J. J. THOMSON, D.Sc, LL.D., Ph.D., F.R.S.

Fellow of Trinity College, Cambridge University; Cavendish Professor of Experimental Physics, Cambridge University. Author of "The Conduction of Electricity through Gases," "Electricity and Matter."

FREDERICK BEDELL, Ph. D.

Professor of Applied Electricity, Cornell University. Author of "The Principles of the Transformer;" Joint Author of "Alternating Currents."

DUGALD C. JACKSON, C.E.

Head of Department of Electrical Engineering, Massachusetts Institute of Technology; Member, American Institute of Electrical Engineers, etc. Author of "A Textbook on Electromagnetism and the Construction of Dynamos;" Joint Author of "Alternating Currents and Alternating-Current Machinery."

MICHAEL IDVORSKY PUPIN, A.B., Sc.D., Ph.D.

Professor of Electro-Mechanics, Columbia University, New York. Author of "Propagation of Long Electric Waves," and "Wave-Transmission over Non-Uniform Cables and Long-Distance Air Lines."

FRANK BALDWIN JEWETT, A.B., Ph.D.

Transmission and Protection Engineer, with American Telephone & Telegraph Co. Author of "Modern Telephone Cable," "Effect of Pressure on Insulation Resistance."

ARTHUR CROTCH

Formerly Lecturer on Telegraphy and Telephony at the Municipal Technical Schools, Norwich, Eng. Author of "Telegraphy and Telephony."

JAMES ERSKINE-MURRAY, D.Sc.

Fellow of the Royal Society of Edinburgh; Member of the Institution of Electrical Engineers. Author of "A Handbook of Wireless Telegraphy."

A.H. MCMILLAN, A.B., LL.B.

Author of "Telephone Law, A Manual on the Organization and Operation of Telephone Companies."

WILLIAM ESTY, S.B., M.A.

Head of Department of Electrical Engineering, Lehigh University. Joint Author of "The Elements of Electrical Engineering."

GEORGE W. WILDER, Ph.D.

Formerly Professor of Telephone Engineering, Armour Institute of Technology. Author of "Telephone Principles and Practice," "Simultaneous Telegraphy and Telephony," etc.

WILLIAM L. HOOPER, Ph.D.

Head of Department of Electrical Engineering, Tufts College. Joint Author of "Electrical Problems for Engineering Students."

DAVID S. HULFISH

Technical Editor, The Nickelodeon; Telephone and Motion-Picture Expert; Solicitor of Patents. Author of "How to Read Telephone Circuit Diagrams."

J.A. FLEMING, M.A., D.Sc. (Lond.), F.R.S.

Professor of Electrical Engineering in University College, London; Late Fellow and Scholar of St. John's College, Cambridge; Fellow of University College, London. Author of "The Alternate-Current Transformer," "Radiotelegraphy and Radiotelephony," "Principles of Electric Wave Telegraphy," "Cantor Lectures on Electrical Oscillations and Electric Waves," "Hertzian Wave Wireless Telegraphy," etc.

F.A.C. PERRINE, A.M., D.Sc.

Consulting Engineer: Formerly President, Stanley Electric Manufacturing Company; Formerly Professor of Electrical Engineering, Leland Stanford, Jr. University. Author of "Conductors for Electrical Distribution."

A. FREDERICK COLLINS

Editor, Collins Wireless Bulletin. Author of "Wireless Telegraphy, Its History, Theory and Practice," "Manual of Wireless Telegraphy," "Design and Construction of Induction Coils," etc.

SCHUYLER S. WHEELER, D.Sc.

President, Crocker-Wheeler Co.; Past-President, American Institute of Electrical Engineers. Joint Author of "Management of Electrical Machinery."

CHARLES PROTEUS STEINMETZ

Consulting Engineer, with the General Electric Co.; Professor of Electrical Engineering, Union College. Author of "The Theory and Calculation of Alternating-Current Phenomena," "Theoretical Elements of Electrical Engineering", etc.

GEORGE W. PATTERSON, S.B., Ph.D.

Head of Department of Electrical Engineering, University of Michigan. Joint Author of "Electrical Measurements."

WILLIAM MAVER, JR.

Ex-Electrician Baltimore and Ohio Telegraph Company; Member of the American Institute of Electrical Engineers. Author of "American Telegraphy and Encyclopedia of the Telegraph," "Wireless Telegraphy."

JOHN PRICE JACKSON, M.E.

Professor of Electrical Engineering, Pennsylvania State College. Joint Author of "Alternating Currents and Alternating-Current Machinery."

AUGUSTUS TREADWELL, JR., E.E.

Associate Member, American Institute of Electrical Engineers. Author of "The Storage Battery, A Practical Treatise on Secondary Batteries."

EDWIN J. HOUSTON, Ph.D.

Professor of Physics, Franklin Institute, Pennsylvania; Joint Inventor of Thomson-Houston System of Arc Lighting; Electrical Expert and Consulting Engineer. Joint Author of "The Electric Telephone," "The Electric Telegraph," "Alternating Currents," "Arc Lighting," "Electric Heating," "Electric Motors," "Electric Railways," "Incandescent Lighting," etc.

WILLIAM J. HOPKINS

Professor of Physics in the Drexel Institute of Art, Science, and Industry, Philadelphia. Author of "Telephone Lines and their Properties."

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