Henry Draper

1837 (Hampden Sydney, Va.) – 1882 (New York)

Draper was a pioneer of astrophotography, despite working at it only part-time. John W. Draper was his father. His younger brother Daniel helped him set up his astronomical observatory. Edison developed a ‘microtasimeter’ for Draper, to measure fluctuations in solar corona temperature during an eclipse (it was over-sensitive).