Physics
Scientific paper
Jun 1882
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1882natur..26..105c&link_type=abstract
Nature, Volume 26, Issue 657, pp. 105 (1882).
Physics
Scientific paper
IN the interest of solar observers I send you a caution. A first-class
sample of black glass was set with a bit of white paper behind it, and
exposed for an instant to the focus of a 7-inch lens. The paper was
charred where an eye would be placed. A longer exposure of a few seconds
made the glass burst asunder.
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