How to conclude apparatus?

means end something but we can't answer without knowing what that is.

Well in science term it is the equipment you will use for your experiment.

A collection of instruments, machines, parts, or other equipment used for a particular purpose

He concluded that this question is completely pointless, yet it still got an answer.

"At Langley, the preferred rules for forming possessives are as follows (G.P.O. 1984; and Rowland 1962): • Form the possessive of a singular or plural noun not ending in s by adding 's. • Form...