In 1932 a 10.5-inch (270mm) reflector telescope was added to the observatory as well as a spectroheliokinematograph {spectro-helio-kine-mato-graph}. This instrument was designed to take motion pictures of the Sun.[1] The McMath-Hulbert Solar Observatory is primarily known for the motion pictures that the McMaths made of various celestial phenomena, including the first movies of solar prominences in motion. Later work involved solar spectroscopy in the near infrared and participation in a solar flare patrol program in the 1950s.
12Leverington, David (2013). Encyclopedia of the History of Astronomy and Astrophysics. Cambridge: Cambridge University Press. p.286. ISBN978-0-521-89994-9.