The 200-inch mirror spent 11 and a half years in the Mirror Lab at Caltech. During its time there the opticians removed 5 and a half tons of glass from the big disc in the process of turning the disc's flat surface into a parabola.
In October, 1947 it was announced that the work had been completed and the opticians took time to pose with the glass giant. From left to right is Alexander Shepherd, Robert George Smith, Blake Mitchell, Cecil Harvey, Arthur Brown, Marcus H. Brown, William Hawes, Melvin Johnson and Lewis Brown.
In the center of the disc is a full-sized replica of the first reflecting telescope ever built, constructed by Sir Isaac Newton in 1671.
After the mirror was crated up and transported to Palomar (a story for another day) it was discovered that Marcus H. Brown, the chief optician for the project, had done what many artists do - he signed his work. Here is his signature, put onto the 200-inch mirror 61 years ago today.