Learn to Invent is a how-to guide by Samuel Evans Clark on the art of invention. Excerpt: «Invention is the fountain source of material progress. It would indeed be a fruitless effort to try to express in adequate language its wondrous possibilities and practical worth to mankind. Its field of action surpasses all others. It is most apparent in our daily walks of life. Every human effort owes it homage. The fame of many inventors has encircled the earth. They have been feted and honored in many ways, their names indelibly inscribed on the roll of the earth's greatest men.»
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