(1) In this Act, unless the context otherwise requires, -
(b) "adult" means a person who has completed his eighteenth year;
(c) "agent", when used in relation to a mine, means every person, whether appointed as such or not, who, acting or purporting to act on behalf of the owner, takes part in the management, control, supervision or direction of the mine or of any part thereof;
(d) Chief Inspector means the Chief Inspector of Mines appointed under this Act;
(e) "Committee" means a committee constituted under section 12;
(f) "day" means a period of twenty-four hours beginning at midnight;
(g) "district magistrate" means, in a presidency-town, the person appointed by the Central Government to perform the duties of a district magistrate under this Act in that town;
(h) a person is said to be "employed" in a mine who works as the manager or who works under appointment by the owner, agent or manager of the mine or with the knowledge of the manager, whether for wages or not -
- (i) in any mining operation (including the concomitant operations of handling and