National Geographic : 1955 Aug
188 Natlonal ueograpnhc 'notogralper .. Baylor Rol)erts Pointing Through the Dome, the Big Schmidt Photographs a Big Dipper-size Patch of Sky Palomar Observatory put into professional use the first Schmidt telescope, an 18-inch model. Its phenomenal success inspired construction of the 48-inch, or Big Schmidt, which made the entire Sky Atlas. To counteract the earth's rotation, Big Schmidt turns slowly from east to west. Astronomer Robert Harrington, watching a guide star in the eyepiece, holds an electric "guiding head" which realigns the instrument if it drifts off course. Joseph Stehlik checks the control panel.