Robert Treat Paine Papers, Volume 3
The Copperworks I1 am concerned in, require so much of my Presence this Time, that it is out of my Power to errect a Sulphur Work myself for the respectable, the Committee of Congress; and it is difficult to instruct a Person in the Method of extracting Sulphur from its ore, without shewing him the manual Operations in Course of the Practice. I have the Honour to be, Sir, your most obedient humble Servant,
On June 28, 1776, Congress appointed Henry Wisner, RTP, and William Floyd as a committee to confer with Anthony Mosengeil on the manufacture of sulphur (Journals of the Continental Congress, 5:502).