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 infirmary is a facility which cares for people who are sick, injured, or infirm. The capabilities of these facilities vary: some are set up like hospitals, capable of treating a wide range of conditions, while others provide more simple and basic medical care.