The Light Machine, by Ray Cummings                                     67208
  [author: Ray Cummings]
  [Link: [1]https://www.gutenberg.org/6/7/2/0/67208]
  [Files: 67208-0.txt; 67208-h.htm]

Thanks to Roger Frank and Sue Clark

References

   1. https://www.gutenberg.org/6/7/2/0/67208