Elihu Thomson (1853-1937) was one of the most inventive scientists of his time and one of the few truly scientific inventors. Because he saw no reason for making sharp separations between the pure and the applied, between science and technology, he was able to illuminate each aspect of his work with the light of his experience in the other. The result, as his correspondence confirms, was a progressive reaching out into numerous areas, some far removed from the electrical studies on which his fame has chiefly rested.This collection of letters on scientific topics, both to and from Thomson,...