In which act introduced the past of Governor general in India at the time of British Era ?

The past of the Governor General in India during the British Era is introduced in Act 1 of the play "An Inspector Calls" by J.B. Priestley. In this act, the character of Mr. Birling, who is a wealthy businessman and former Lord Mayor, mentions that he was once a colleague of the Governor General in India. This reference to the Governor General's past highlights the social status and connections of the characters in the play, as well as the colonial history of Britain in India.

Government of India Act, 1919