Abstract
AS time passes and astronomical work advances there is a greater demand, year by year, for more powerful instruments of research. Fortunately, instrument makers have so far been able to fulfil the requirements for large refractors and reflectors, but a few years ago the time seemed to be reached when further progress appeared a long distance off. At the present day there are refractors in existence the object-glasses of which are as large as 30, 36, and 40 inches in diameter, while the greatest glass mirror that has been used measures 60 inches in diameter.
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A 100-Inch Reflecting Telescope. Nature 75, 81–82 (1906). https://doi.org/10.1038/075081a0
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DOI: https://doi.org/10.1038/075081a0