The pressure-sensitive element of an aneroid barometer is called a __________.

Correct Answer: Option C — sylphon cell

The sylphon cell is a thin-walled, corrugated metal bellows partially evacuated of air. As atmospheric pressure changes, the cell expands or contracts, moving a mechanical linkage to indicate pressure on the barometer dial. Bowditch identifies this as the core pressure-sensitive component in all standard aneroid barometers used aboard vessels.