Lectures on the electro-magnetic telegraph, [electronic resource] with an historical account of its rise and progress, containing a list of the number of telegraphic lines of the world.
Electronic text and image data. Ann Arbor, Mich. : University of Michigan, Digital Library Initiatives, 2000. Includes both TIFF files and keyword searchable text. [Making of America] This volume is made possible by a grant from the Andrew W. Mellon Foundation as part of Making of America IV: the American voice, 1850-1877.