Which deliberations are you thinking of? At the Philadelphia Convention, where the US Constitution was granted, the Founders deliberated in secret because the Continental Congress only wanted them to revise the Articles of Confederation, not replace them. Our main source for the deliberation is James Madison's notes. I believe Madison became a sort of de facto recording secretary, and other delegates gave him their speeches and notes. There was an official secretary who also took notes. John Quincy Adams published the secretary's journals in 1818. Other attendees took notes and published their own records at various times. Other notes, including Alexander Hamilton's, survived. A historian named Max Farrand published a collection of all the notes and publications ne could find in 1911, and I think this remains the best source. I think much of this collection is available on line.
