under the supervision of the Principal empleyer or as its agents ? From the above backdrop of statutory operation, the scope of section 2(9) is to be gauged which reads thus: "2(9) 'employee ' means any person employed for wages in or in connection with the work of a factory or establishment to which this Act applies and (i) who is directly employed by the principal employer on any work of, or inciden tal or preliminary to or connected with the work of, the factory or establishment, whether such work is done by the employee in the factory or establishment or elswhere; or (ii) who is employed by or through an immediate employer on the premises of the factory or establishment or under the supervi sion of the principal employer or his agent on work which is ordinarily part of the work of the factory or establishment or which is preliminary to the work carried 293 on in or incidental to the purpose of the factory or establishment; or (iii) Whose services are temporarily lent or let on hire to the principal employer by the person with whom the person whose services are so lent or let on hire has entered into a contract of service .