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.
Douglass Adair
Douglass Greybill Adair (March 5, 1912 – May 2, 1968) was an American historian who specialized in intellectual history. He is best known for his work in researching the authorship of disputed numbers of "The Federalist Papers", and his influential studies in the history and influence of republicanism in the United States during the late eighteenth and early nineteenth centuries—the era of the Enlightenment. His most famous essay, "Fame and the Founding Fathers," introduced the pursuit of fame as a new motivation for understanding the actions for the Framers.