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.

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

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

HORATIO A. FOSTER

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

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

ROBERT ANDREWS MILLIKAN, Ph.D.

KEMPSTER B. MILLER, M.E.

WILLIAM H. PREECE

LOUIS BELL, Ph.D.

OLIVER HEAVISIDE, F.R.S.

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

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

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

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

FREDERICK BEDELL, Ph. D.

DUGALD C. JACKSON, C.E.

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

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

ARTHUR CROTCH

JAMES ERSKINE-MURRAY, D.Sc.

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

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

GEORGE W. WILDER, Ph.D.

WILLIAM L. HOOPER, Ph.D.

DAVID S. HULFISH

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

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

A. FREDERICK COLLINS

SCHUYLER S. WHEELER, D.Sc.

CHARLES PROTEUS STEINMETZ

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

WILLIAM MAVER, JR.

JOHN PRICE JACKSON, M.E.

AUGUSTUS TREADWELL, JR., E.E.

EDWIN J. HOUSTON, Ph.D.

WILLIAM J. HOPKINS

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