The toughest part of inventing isn’t solving problems. It’s figuring out which problems are worth the effort.
"A few years ago, an inventor patented a device that caused an electric motor to rock a chair," wrote Raymond F. Yates in 1942. "Now imagine, if you will, the sad spectacle of anybody too lazy to rock his own chair! No wonder he could not make money. If he had expended the same effort on something that was actually needed, he might be wealthy today instead of being sadder but wiser."
Mr. Yates, a self-taught engineer, inventor and technical writer, tried to nudge other inventors in the right direction with his book, "2100 Needed Inventions." Published by Wilfred Funk Inc., Mr. Yates’s book was a list of ways people could alleviate certain nuisances and defects of life and get rich for their trouble.
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"Invention is really a systematic form of criticism," Mr. Yates wrote, and people tend to criticize the things that annoy them in their daily lives. Mr. Yates, for example, seems to have found most commonplace devices excessively noisy.
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