Draper of New York in 1840; but it was not possible to do much in this direction until the more sensitive process of photographing on glass was introduced instead of the daguerreotype.
Westlake was once again off photographing; the Dawkins, in independent pairs, Jeeping somewhere in the mountains, probably spying on one another.
In 1860 De la Rue took the photoheliograph to Spain for the purpose of photographing the total solar eclipse which occurred on the 18th of July of that year.
SPECTROHELIOGRAPH, an instrument for photographing the sun with monochromatic light.
The spectroheliograph, originally designed for photographing the solar prominences, disclosed in its first application at the Kenwood Observatory (Chicago, 1892) a new and unexplored region of the sun's atmosphere.