first edition Illustrated. vi, -128 pp. 1 vols. 12mo
1877 · Boston
by Dolbear, Prof A[mos] E[merson]
Boston: Lee & Shepard, Publishers. New York Charles T. Dillingham, 1877. First edition. Illustrated. vi, -128 pp. 1 vols. 12mo. Bound in bright green cloth, lettered in black. Fine. First edition. Illustrated. vi, -128 pp. 1 vols. 12mo. A. E. Dolbear (1837-1910) was a physics professor at Tufts College and had invented the first telephone receiver with a permanent magnet as early as 1865. . He was also twice mayor of Bethany, West Virginia.
"As the speaking-telephone, in which magneto-electric currents were utilized for the transmission of speech and other kinds of sounds, was invented by me, I have described at some length my first instrument, and have also given explicit directions for making a speaking-telephone which I know, by trial, to be as efficient as any hitherto made" (from the Preface).
(Inventory #: 226492)