"Fooling around with alternating current is just a waste of time. Nobody will use it, ever."
Thomas Edison, American inventor, 1889 (Edison often ridiculed the arguments of competitor George Westinghouse and Nicolai Tesla for AC power).
"Where a calculator on the ENIAC is equipped with 18,000 vacuum tubes and weighs 30 tons, computers in the future may have only 1,000 vacuum tubes and weigh only 1.5 tons."
Popular Mechanics, March 1949.
"Radio has no future."
Lord Kelvin, Scottish mathematician and physicist, former president of the Royal Society, 1897.
"The wireless music box has no imaginable commercial value. Who would pay for a message sent to no one in particular?"
Associates of David Sarnoff responding to the latter's call for investment in the radio in 1921.
"Very interesting Whittle, my boy, but it will never work."
Cambridge Aeronautics Professor, when shown Frank Whittle's plan for the jet engine.
"Heavier-than-air flying machines are impossible."
Lord Kelvin, British mathematician and physicist, president of the British Royal Society, 1895.
"The Americans are good about making fancy cars and refrigerators, but that doesn't mean they are any good at making aircraft. They are bluffing. They are excellent at bluffing."
Hermann Goering, Commander-in-Chief of the Luftwaffe, 1942.
"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, Chief Engineer, British Post Office, 1878.
"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist and author of Inventing the Future, 1962.
"... good enough for our transatlantic friends ... but unworthy of the attention of practical or scientific men."
British Parliamentary Committee, referring to Edison's light bulb, 1878.