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 institute is  an organisational body created for a certain purpose. Often they are research organisations (research institutions) created to do research on specific topics. An institute can also be a professional body, or one involved in adult education, see Mechanics' Institutes. In some countries institutes can be part of a university or other institutions of higher education, either as a group of departments or an autonomous educational institution without a traditional university status such as a university Institute.