| Answer | Crossword Clue |
|---|---|
| pibal | a small balloon for determining wind direction and speed |
| pibals | PIBAL, a small balloon for determining wind direction and speed |
| pibals | the measurement and computation of the speed and direction of winds by theodolitic tracking of a pilot balloon |
| pibal | the measurement and computation of the speed and direction of winds by theodolitic tracking of a pilot balloon |
| anemograph | An anemometer that records on paper the speed, duration, and sometimes also the direction of the wind |
| anemographs | An anemometer that records on paper the speed, duration, and sometimes also the direction of the wind |
