An inspector calls, analysis of end of act two

Looking again at the end of act two, how does Priestley make the ending scene dramatically effective?
At the end of act two, Priestley uses several techniques in order to make the scene dramatically effective. The carefully written script creates an atmosphere of suspense and tension. The techniques Priestly uses in the script are irony and the dismantling of the false sense of security amongst the characters and consequently the audience.
Originally the characters feel secure because they feel that Eva's death had nothing to do with them. In particular Mr and Mrs Birling' s nature is…