How to make inventions; or, Inventing as a science and an art . theproperty of varying the current, according to the pressure upontwo pieces in loose contact and in an electric circuit. Fouryears later, when inventing in the subject of telephones, he re-called the new knowledge, and by introducing semi-conductorsinto a circuit, and talking against them, he thereby applied thenew knowledge to a useful purpose. Berliner made the sameinvention, nearly at the same time. The interference case beforethe Patent Office proved Berliner the prior inventor. The sim-ultaneous feature would have been elimi
How to make inventions; or, Inventing as a science and an art . theproperty of varying the current, according to the pressure upontwo pieces in loose contact and in an electric circuit. Fouryears later, when inventing in the subject of telephones, he re-called the new knowledge, and by introducing semi-conductorsinto a circuit, and talking against them, he thereby applied thenew knowledge to a useful purpose. Berliner made the sameinvention, nearly at the same time. The interference case beforethe Patent Office proved Berliner the prior inventor. The sim-ultaneous feature would have been eliminated, and Edison sue- 146 cessful if he had applied the principle as soon as accompanying cut illustrates simultaneous inventions. Thetwo figures show a pneumatic bicycle tire, having an importantnovel feature which was invented independently by residents ofChicago, U. S. A., and Brooklands, England, respectively, andwhich was contested before the U. S. Patent Office. Either fig-ure is almost a copy of the other, although both are exact copies. of the Patent Office drawings furnished by the inventors, the one,secretly from the other. The feature is that of an internal,longitudinal rubber partition, so that when either half of the tirecollapses the remaining one may be inflated. CHAPTER XVII. Simplicity the Result of Specific Invention. It is a principle that the final type is simpler in constructionthan the generic invention. ^^i> The first envelope machine was as confusing in appearanceas the wisps of hay in a haystack. Nearly every physical invention is at first of low efficiency,complex and intricate in construction, and tending very much to 147 drive the inventor into despair. If he has evidence that he is onthe right track, he should not stop for such difficulties, by aband-oning the invention and finding afterwards that others com-menced where he left off and succeeded. It is far better, as alast resort, to get assistance of another inventor at the expe
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