Phenomena of Electricity, Magnetism, and Sound,
A. E. Dolbear
AS INVOLVED IN ITS ACTION.
WITH DIRECTIONS FOR MAKING
A SPEAKING TELEPHONE.
BY
PROF. A. E. DOLBEAR,
TUFTS COLLEGE,
Author of "The Art of Projecting," etc.
BOSTON:
LEE & SHEPARD, PUBLISHERS.
COPYRIGHT,
1877,
By A. E. Dolbear
.
Clyx.com
