Mayall 4-meter primary blank

Mayall 4-meter primary blank

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Four meter mirror on grinding table shortly after arrival at Kitt Peak. Some areas were polished clear by Corning for inspection. Note the many hexagonal sections of quartz glass that were fused together to form this very large mirror.

Glynn Pickens and Mark Hanna both appear (Hanna twice) in this multiple exposure picture. Photograph by John Lutnes.

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