John Donavan Strong, a young physicist at the California Institute of Technology, was one of the first to coat a mirror with aluminum.
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The history of the telescope Henry C
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Atti Della Fondazione Giorgio Ronchi E Contributi Dell'Istituto Nazionale Di Ottica, Volume 30, La Fondazione-1975, page 554• "The Hague discussed the patent applications first of Hans Lipperhey of Middelburg, and then of Jacob Metius of Alkmaar
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The first mirror he aluminized, in 1932, is the earliest known example of a telescope mirror coated by this technique