The tone implied by the inspector’s words is that he is quite blunt, and he does not mince his words. He speaks like this because he does not have time to waste with niceties. The tone he speaks also implies that there are more to come and the Birlings are practically criminals. As well as that, the inspector sounds like a socialist since he is judgemental of Mr Birlings treatment of his workers. The inspector is treated as the mouthpiece of JB Priestley’s beliefs since JB Priestley stands for all the beliefs of the inspector. The message implied by the inspector’s words at the act one is that you cannot really hide anything from him and that he is the one leading the conversation no matter what anyone else thinks.