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Silver 30 Minute Hourglass

30 min hour glass 

Ship’s hourglasses were calibrated to the half hours of the ship’s watch, and if the helmsman didn’t turn the glass too early it actually doubled in defining longitude. Navigators tried to keep count of the hours; the galleons wrecked on the Western Australian reef show the perils of incorrectly kept time.

- Black french finish / silver

- 13.5cm high