THOMAS A. EDISON DICTATING TO HIS GRAPHOPHONE
HARPER’S
ELECTRICITY BOOK
FOR BOYS
WRITTEN AND ILLUSTRATED BY
JOSEPH H. ADAMS
AUTHOR OF
“HARPER’S OUTDOOR BOOK FOR BOYS”
WITH AN EXPLANATION OF ELECTRIC LIGHT, HEAT
POWER, AND TRACTION BY JOSEPH B. BAKER
TECHNICAL EDITOR, U. S. GEOLOGICAL SURVEY
AND
A DICTIONARY OF ELECTRICAL TERMS
HARPER & BROTHERS PUBLISHERS
NEW YORK AND LONDON
MCMVII