University of Nebraska Press
  • Astronomical Fieldwork and the Spaces of RelativityThe Historical Geographies of the 1919 British Eclipse Expeditions to Príncipe and Brazil
Fig 2. The 16-inch astrographic (left) and the 4-inch telescope (rear) with their coelostats (front) as they were set up in Sobral. Astrographic telescopes were used to photograph stars and other faint celestial phenomena, while the coelostat was a slowly turning mirror designed to continuously reflect part of the sky into the telescopes. Just as in Príncipe, these instruments and their accompanying huts and concrete stands required large open spaces and flat, stable ground on which to operate accurately. Image courtesy of the Science and Society Picture Library, Science Museum, London.
Fig 2.

The 16-inch astrographic (left) and the 4-inch telescope (rear) with their coelostats (front) as they were set up in Sobral. Astrographic telescopes were used to photograph stars and other faint celestial phenomena, while the coelostat was a slowly turning mirror designed to continuously reflect part of the sky into the telescopes. Just as in Príncipe, these instruments and their accompanying huts and concrete stands required large open spaces and flat, stable ground on which to operate accurately. Image courtesy of the Science and Society Picture Library, Science Museum, London.

Share