The 40-Foot Solar Eclipse Camera of the Lick Observatory

Details The 40-Foot Solar Eclipse Camera of the Lick Observatory The 40-Foot Solar Eclipse Camera of the Lick Observatory

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21320004p&link_type=abstract

American Astronomical Society, AAS Meeting #213, #200.04; Bulletin of the American Astronomical Society, Vol. 41, p.186

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Scientific paper

The primary goal of the Lick Observatory's direct solar eclipse photography program was to secure high-resolution images of coronal detail that was visible only during the brief moments of a total eclipse of the Sun. Obtaining a wide range of plate scales of the eclipsed Sun became a vital necessity in accomplishing this objective. Cameras and telescopes with unique pedigrees_some of which were originally intended for other astronomical and non-astronomical duties_were put to the test.
The Lick Observatory sent seventeen eclipse expeditions worldwide beginning January 1889 and ending in 1932. Direct coronal photography was a significant part of the program and continued to the end of the expedition series. These expeditions occurred at a time when little was known about coronal content, motion within the corona or the forces that shaped the corona.
Early successful attempts by E.E. Barnard, S.W. Burnham and J.M. Schaeberle to obtain coronal photographs with increasing image size and resolution set the stage for Schaeberle. He designed what would become the hallmark of the Observatory's expeditions, a camera of 5-inches aperture with a 40-foot focal length. It was this instrument which set the new standard for high-resolution eclipse imaging. By the end of the expeditions, new generation cameras originally intended for Vulcan searches and Einstein theory of relativity verification imaging replaced the 40-foot camera for coronal photography.
This paper will present the cameras, their operators, views of the instruments at the various eclipse sites, a sample of the images produced and a summary of the Lick Observatory's most significant contributions to coronal science.

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