"Finally it was submitted that the industrial tribunal was under a duty to state the law, its primary findings of fact, its secondary findings of fact and its conclusions. This is wholly misconceived. The duty of an industrial tribunal is to give reasons for its decision. This involves making findings of fact and answering a question or questions of law. So far as the findings of fact are concerned, it is helpful to the parties to give some explanation for them, but it is not obligatory. So far as the questions of law are concerned, the reasons should show expressly or by implication what were the questions to which the industrial tribunal addressed its mind and why it reached the conclusions which it did, but the way in which it does so is entirely a matter for the industrial tribunal."