Here is a photo taken by Lee A. Farnsworth, Jr in the fall of 1938. It was taken from the catwalk of the dome of the 200-inch telescope looking down on some of the first telescope parts to arrive.
In back is the prime focus cage. In the middle is the ring that surrounds the 200-inch mirror that holds it to the telescope's "tube". Note the people and cars which help to give a sense of scale.