A small meteorological balloon used to track air currents.
- ‘In addition to the tethered Skyhooks, Gildenberg would release small pilot balloons to measure wind speeds during the experiments.’
- ‘Wind measurements were performed every 4 hours by tracking the ascent of a pilot balloon by radar.’
- ‘This computes a vertical profile of wind direction and speed given the radio telemetry observations of a pilot balloon.’
- ‘With the growth of aviation activity in the country, pilot balloon observations were started in 1928 to generate daily upper air wind data for pilots.’
We take a look at several popular, though confusing, punctuation marks.