He was invaluable to Wynand—as a barometer of public reaction.
I made myself into a barometer subject to the pressure of the whole world.
She let her hands lie in sight on the arms of her chair, so that the relief of any violent motion would be denied her, her hands as her private barometer of endurance, when Wynand came home late at night and told her that he had spent the evening at Roark’s apartment, the apartment she had never seen.
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.