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.
Clinic(noun) one confined to the bed by sickness. Clinic(noun) one who receives baptism on a sick bed. Clinic(noun) a school, or a session of a school or class, in which medicine or surgery is taught by the examination and treatment of patients in the presence of the pupils.