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Its silvery surface, which weighs the invisible...

  • 1 of 5: The full riddle is, "Its silvery surface which weighs the invisible has frequently saved you from winds so terrible."
  • 2 of 5: Look around the room at all of the devices located there.
  • 3 of 5: There are quite a few for making various meteorological measurements.
  • 4 of 5: Read carefully about each of them.  Which deals with "weighing the invisible", and reporting "winds so terrible"?
  • 5 of 5: The answer is the barometer on the wall near the safe.