The postcard above shows Henry Ford, Thomas A. Edison, and Harvey Firestone at the Edison home in Fort Myers, Florida. The photo appears to be a colorized version of a black and white original. The Library of Congress has a black and white photo that seems to be identical (only the thumbnail is available online).
Ford, Edison, and Firestone were considered the three leaders in American industry at the time, and often worked and vacationed together. Between 1914 and 1924 they participated in a number of "vagabond" automobile camping trips together. Another friend who sometimes participated in trips with them was the famous author John Burroughs. The photo below shows Thomas Edison, John Burroughs, and Henry Ford at Edison's home in Fort Myers.
The last photo shows all four men posed on an old waterwheel in West Virginia in 1918. Left to right are Harvey Firestone, Henry Ford, John Burroughs and Thomas A. Edison.
Here is some biographical information about the four men from Widipedia:
• Henry Ford (July 30, 1863 – April 7, 1947) was a prominent American industrialist, the founder of the Ford Motor Company, and sponsor of the development of the assembly line technique of mass production. His introduction of the Model T automobile revolutionized transportation and American industry.
• Thomas Alva Edison (February 11, 1847 – October 18, 1931) was an American inventor, scientist, and businessman who developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and a long-lasting, practical electric light bulb.
• Harvey Samuel Firestone (December 20, 1868 – February 7, 1938) was an American businessman, and the founder of the Firestone Tire and Rubber Company, one of the first global makers of automobile tires.
• John Burroughs (April 3, 1837 – March 29, 1921) was an American naturalist and essayist important in the evolution of the U.S. conservation movement.…By the turn of the century he had become a virtual cultural institution in his own right: the Grand Old Man of Nature at a time when the American romance with the idea of nature, and the American conservation movement, had come fully into their own.
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