2.8. Lesson 9: Know Properties, Not Theories

Edison was always more interested in the properties of substances—in which he saw the potential for practical, creative application—than in theories about how things worked. For example, when he discovered that compressed carbon was highly sensitive to variable electric currents, he created what became the carbon button transmitter, an innovation that greatly increased the sensitivity and the fidelity of telephone transmission.

The carbon button proved to be one of Edison's most profitable and enduring innovations, lasting (as noted) well into the 1970s. Yet, in classic Edison fashion, the inventor persisted in exploring the properties of compressed carbon even after he had successfully created and ...

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