In this Part of this Act " industrial building" means a building used or designed for use—
being a process or research carried on in the course of a trade or business.
For the purposes of subsection (1) of this section, premises which—
shall themselves be treated as used or designed for use for the carrying on of such a process or, as the case may be, of such research.
In this section—
" article " means an article of any description, including a ship or vessel;
" building " includes a part of a building;
" scientific research '' means any activity in the fields of natural or applied science for the extension of knowledge.