What is the story of The Auld Triangle?

The auld (old) triangle refers to the large metal triangle which was beaten each morning to waken prisoners in Mountjoy Jail, Dublin. The song is featured in the writer of the song Dominic Behan’s writer brother, Brendan Behan’s ‘The Quare Fellow’. Brendan Behan was once an inmate of Mountjoy Jail.

Who sang the Auld Triangle?

The Dubliners
The Old Triangle/Artistes