Eclipse instrumentation for the solar corona.

  title={Eclipse instrumentation for the solar corona.},
  author={Donald Howard Menzel and Jay M. Pasachoff},
  journal={Applied optics},
  volume={9 12},
The expedition of the Harvard College Observatory, the Smithsonian Astrophysical Observatory, and the National Geographic Society to Miahuatlán, Mexico, to observe the total solar eclipse of 7 March 1970, is described. Instrumentation included a coronal spectrograph, television cameras recording on videotape, telescopes for photography of coronal polarization, and cameras for direct photography. Photographs and preliminary microphotometer tracings are included. 
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