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Crowds gather in Pasadena to see the arrival of the 200-inch lens for the future Hale Telescope, largest in the world when completed. April 10, 1936.

Crowds gather in Pasadena to see the arrival of the 200-inch lens for the future Hale Telescope, largest in the world when completed. April 10, 1936.

200-inch, 20-ton lens for the future Hale Telescope, after its arrival in Pasadena, CA. Circa April 10, 1936.

Oscillograph for photographing electrons, California Institute of Technology, Pasadena, 1928