Section 9(1) of the Principal Act is amended by substituting the following for paragraph (b):
"(b) where, under the contract under which the employee is employed by the employer the employee is employed for a fixed term or for a specified purpose (being a purpose of such a kind that the duration of the contract was limited but was, at the time of its making, incapable of precise ascertainment), that term expires or that purpose ceases without being renewed under the same or similar contract, or".