But now Lydgate came in; the book was closed before he reached Rosamond’s corner, and as he took his seat with easy confidence on the other side of her, young Plymdale’s jaw fell like a barometer towards the cheerless side of change.
There are no more uses of "barometer" in the book.
Show samples from other sources
The barometer indicates a storm is coming.
Lowered barometric pressure for him was like laughing gas.