Photograph is probably of Charlie Wilson striping ladle of excess glass; it is probable that it is Wilson because the man is wearing a protective facial shield that appears to be attached to a catcher's mask, a signature feature of Wilson's. Another man, to Wilson's right, assists.
"Corning, N.Y. - the second 200-inch mirror for the world's greatest telescope, the astronomical eye that will see one million times better than a human eye, being placed in the furnace today at the Corning Glass Works as it was poured without a single flaw. D-12/2/34." -- typed on small piece of paper affixed to verso.