Being chased by the Chinese, Luke Raliegh (scientist extraordinaire) and his pal Harry build a giant gyroscope that spins so fast it takes them into the future where they cure the yellow rot and save the world.

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  1. Emperors of Space by Jerome Gross and Richard Penny, in Wonder Stories, November 1931.
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Jerome Gross