Black and white image of Hoover Dam with the following printed description: "View of 50-foot diameter tunnel below Arizona Tunnel Plug outlet works with Stoney Gate at end of tunnel lowered." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

A side view of the HK-1, Hughes Flying Boat, the world's largest plane, which successfully completed its first flight. The eight 3,000 horsepower engines lifted the craft from the waters of Los Angeles Harbor with Hughes at the controls. The plane is 219 ft long.

Aerial view of the airport at Hughes' aircraft plant in Culver City, California. The airport's runway was in operation from 1941 to 1985.

Howard Hughes with his flight engineer and Dave Evans, radio operator, preparing for the Flying Boat's taxi test the next day. The group is shown on the flight deck of the 24,000 horsepower craft. The Flying Boat was assembled on Terminal Island in the Los Angeles Harbor.

Press release attached to back of photo: "A roughneck fits a new Hughes Jet bit into the drill collar preparatory to running the drill stem into the hold. In 1953 more than 500,000 rock bits produced by the Hughes Tool Company of Houston, Texas, were used in the United States alone. The invention of the rock bit by Howard R. Hughes, Sr., made it possible to drill far deeper into the earth beyond the shallow oil deposits which are now practically exhausted. Without rotary drilling equipment of this kind the world might revert to a horse and buggy economy."