Benjamin Franklin Papers - Churchman, John (1753-1805)

Churchman, John (1753-1805)

Philadelphia surveyor and pioneer in the study of geomagnetism.

s Mon, Jul 3, 1786
s Wed, Feb 14, 1787
s Wed, Feb 14, 1787
s Thu, Mar 1, 1787
s Sat, Mar 17, 1787
s Sat, Mar 31, 1787
s Sun, Apr 1, 1787
s Mon, Jul 2, 1787
s Sat, Mar 21, 1789