Never could Starbuck forget the old man’s aspect, when one night going down into the cabin to mark how the barometer stood, he saw him with closed eyes sitting straight in his floor-screwed chair; the rain and half-melted sleet of the storm from which he had some time before emerged, still slowly dripping from the unremoved hat and coat.
There are no more uses of "barometer" in the book.
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The barometer indicates a storm is coming.
Lowered barometric pressure for him was like laughing gas.