Eaton, Francis Jehl, W. S. Andrews, W. J. Jenks, W. J. Hammer, F. J.
Sprague, W. S. Mallory, and C. L. Clarke, and others, without whose
aid the issuance of this book would indeed have been impossible. In
particular, it is desired to acknowledge indebtedness to Mr. W. H.
Meadowcroft not only for substantial aid in the literary part of the
work, but for indefatigable effort to group, classify, and summarize the
boundless material embodied in Edison's note-books and memorabilia of
all kinds now kept at the Orange laboratory. Acknowledgment must also
be made of the courtesy and assistance of Mrs. Edison, and especially
of the loan of many interesting and rare photographs from her private
collection.




EDISON HIS LIFE AND INVENTIONS




CHAPTER I

THE AGE OF ELECTRICITY

THE year 1847 marked a period of great territorial acquisition by
the American people, with incalculable additions to their actual and
potential wealth. By the rational compromise with England in the dispute
over the Oregon region, President Polk had secured during 1846, for
undisturbed settlement, three hundred thousand square miles of forest,
fertile land, and fisheries, including the whole fair Columbia Valley.