William C. Dustin was principal of No. 1 school in Beloit.

The evidence

• “In 1855 "William C. Dustin was principal of No. 1, with his wife as assistant;”

  1908-brown-rock-county/11-beloit-schools.md, Vol. 1, PDF p. 271 / book p. 248

  Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.

  Grade A: Found on a page of one of our sources