How to make inventions; or, Inventing as a science and an art (1893)
Thompson, Edward P · New York, D. Van Nostrand co · leaf 163
ries. Sometimes, and especially in the early days of the age ofinvention, several generations were occupied in the perfection ofan invention. In one generation, the mental invention is made.In the second, the crude generic invention; and in the third, theperfected, specific form. Thus it was with… … model boat propelled by a wooden screw, driven by a wound-upspring. Later, he built a large boat and exhibited it on a canal,using steam power. A few years later Ericsson constructed andpatented, and introduced the specific form in use at present. Prof. Houston, of the Franklin Institute, states…
Inventions
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