Abstract
IN engineering, the progress of the evolution of inventions seldom proceeds along a straight line, each step leading directly and logically to its successor. The evolution often proceeds in a looped path, new inventions apparently returning to an earlier stage of development before making a new start in another direction. This is illustrated in a paper read by W. L. McPherson and E. H. Ullrich to the Institution of Electrical Engineers on January 30.
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Micro-Ray Communication. Nature 137, 628 (1936). https://doi.org/10.1038/137628a0
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DOI: https://doi.org/10.1038/137628a0