Definitions for "Pilot balloon"
A small, unmanned balloon sent up to indicate the direction of air currents.
A small ascending balloon observed with a theodolite in order to obtain data for the computation of the speed and direction of upper-air winds.
meteorological balloon used to observe air currents
Plastic sack-like component connected to the inflation line and luer valve of the tracheostomy tube which allows for inflation and deflation of the cuff.