Original meaning
Originalists of all stripes cite "The Federalist Papers". It is fairly tenuous to suggest that this represents a good source for the original "intent": after all, Alexander Hamilton, who wrote the majority of those essays, was absent for the greater part of the Philadelphia Convention, and John Jay did not attend it at all. However, James Madison, the principal framer of the Constitution also wrote a substantial amount of "The Federalist Papers". Also, to suggest Hamilton and Jay's absence from the convention implies their ignorance as to the Constitution's original meaning is demeaning to those two men and inaccurate. The collected anti-Federalist papers, of course, will be no use at all to a person searching for the original "intent" of the framers. However, as evidence of how a reasonable person at the time would have understood the words of the Constitution, "The Federalist Papers" and the anti-Federalist essays are evidence of direct relevance.
Federalist No. 16
Federalist No. 16, titled "The Same Subject Continued: The Insufficiency of the Present Confederation to Preserve the Union", is one out of the eighty-five articles collected in the document The Federalist Papers (formerly known as The Federalists). The entire collection of papers was written by Alexander Hamilton, James Madison, and John Jay. Federalist Paper No. 16, written by Alexander Hamilton, was published on December 4, 1787. According to James Madison, "the immediate object of them was to vindicate and recommend the new Constitution to the State of [New York] whose ratification of the instrument, was doubtful, as well as important". In addition, the articles were written and addressed "To the People of New York".