"Anything done by a person in the course of his employment shall be treated for the purposes of this Act as done by his employer as well as by him, whether or not it was done with the employer's knowledge or approval."
"The application of the phrase will be a question of fact for each industrial tribunal to resolve, in the light of the circumstances presented to it, with a mind unclouded by any parallels sought to be drawn from the law of vicarious liability in tort."