How to make inventions; or, Inventing as a science and an art (1893)
Thompson, Edward P · New York, D. Van Nostrand co · leaf 151
aic pile, analternate increase and decrease of distance between the plates,causing variable amounts of current generated; To vary the shape of a globule of mercury balanced in aconducting liquid, the vibrations of the better conductor, mer-cury, varying the resistance of the circuit; 136 To vary… … ment, as it shows up the defects to be remedied, calls for com-pleteness of conception of important details, and may^etermine 137 the question of operativeness. It is almost like building a model,but is greatly cheaper and much more easily accomplished.When the sketches are made, the inventor…
Inventions
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