What optical device is the Dutch scientist, after whom the lunar crater Jansen is named, credited for?
Zacharias Janssen Zacharias Janssen (also Zacharias Jansen or Sacharias Jansen) (1585 – pre-1632) was a Dutch spectacle-maker from Middelburg associated with the invention of the first optical telescope. Janssen is sometimes also credited for inventing the first truly compound microscope. However, the origin of the microscope, just like the origin of the telescope, is a matter of debate.
John William Draper John William Draper (May 5, 1811 – January 4, 1882) was an English-American scientist, philosopher, physician, chemist, historian and photographer. He is credited with producing the first clear photograph of a female face (1839–40) and the first detailed photograph of the moon in 1840. He was also the first president of the American Chemical Society (1876–77) and a founder of the New York University School of Medicine. One of Draper's books, the "History of the Conflict between Religion and Science", popularised the conflict thesis proposing intrinsic hostility in the relationship between religion and science. It was widely read, and was translated into several languages. His son, Henry Draper, and his granddaughter, Antonia Maury, were astronomers, her younger sister, Carlotta Maury was a paleontologist, and his eldest son, John Christopher Draper, was a chemist.