Abstract
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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CAMPBELL, J. Caution to Solar Observers. Nature 26, 105 (1882). https://doi.org/10.1038/026105c0
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DOI: https://doi.org/10.1038/026105c0
