Mayall 4-meter primary blank

[KPNO 4m] Mayall 4-meter primary blank

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Lowering the Mayall 4-meter primary mirror blank down onto the grinding table. Norm Cole (left) and Harold Wirth (right). Photograph by John Lutnes and Mark Hanna.

Minimum credit line: John Lutnes, Mark Hanna/NOAO/AURA/NSF (for details see Conditions of Use)

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