When an engine is ignited, it produces thrust and boosts the rocket into the sky. After the propellant is used up, delay is activated, producing tracking smoke and allowing the rocket a brief coast.
infirmary (plural infirmaries) 1  A place where sick or injured people are cared for, especially a small hospital; sickhouse. 2  A clinic or dispensary within another institution.
an institution in which sick or injured persons are given medical or surgical treatment. 2. a similar establishment for the care of animals. 3. a repair shop for specific portable objects: violin hospital; doll hospital. 4. British. an institution supported by charity or taxes for the care of the needy, as an orphanage or old people's home.