“The Titanic... unsinkable, absolutely unsinkable”
Context: Birling boasts about progress and technology at the dinner party.
Analysis
The Titanic sank in 1912, the year the play is set. Priestley uses dramatic irony to undermine Birling's credibility. The repetition of "unsinkable" emphasizes his foolish certainty. His confidence in human progress parallels his social complacency.
Language Techniques:
Exam Tip
The audience knows Birling is wrong - this makes them question his other views. Links to his wrong predictions about war.