American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 413
ex. the edison phonoplex. The Telephone.A detailed description of the telephone, in theory and practice; its apparatus,xjonnections, etc., would furnish matter for a book of no small dimensions, if devoted^exclusively to that purpose. It is, therefore, not feasible to enter into a lengthy ac-count…
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
