Conversation so far:
what is the role of mr. barthwick in the play the silver box
The three scenes of the first Act of The Silver Box take place in the London dining room of John Barthwick, a Liberal member of parliament.
how many acts does the play the silver box have
The Silver Box is a three-act comedy.

Question: where was the play originally produced
Self-contained rewrite: where was the play  the silver box originally produced