| Answer | Crossword Clue |
|---|---|
| pneumatometer | an instrument for measuring quantity of air breathed |
| pneumatometers | PNEUMATOMETER, an instrument for measuring quantity of air breathed |
| gradiometer | an instrument for measuring gradient of a physical quantity |
| gradiometers | GRADIOMETER, an instrument for measuring gradient of a physical quantity |
| volumometer | an instrument for measuring the volume of a solid body by the quantity of fluid it displaces |
| volumometers | VOLUMOMETER, an instrument for measuring the volume of a solid body by the quantity of fluid it displaces |
