For 12 million years it trickled, meandered, and snaked, before bursting violently loose to slash to its final destination. Then, one winter day in 1935, this ancient, tempestuous journey abruptly ended in a remote canyon as the last of more than 5 million buckets of concrete was poured onto the crest of a 726-foot wall that blocked its path. Observers watched in awe as the nation’s wildest river puddled up behind the massive structure. Soon the benign-looking pond would reach back for 115 miles to a depth of 500 feet, the largest human-made lake in the world.
1930s
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The precision "choreographed" staging of Radio City Music Hall offers size and versatility, unlike any other. Built in 1932 by Peter Clark, its innovative elevator system is a forerunner of other stage designs (including the Metropolitan Opera House) as well as aircraft carrier systems built in World War II. These elevators can handle people, animals, props and scenery at variable speeds, delivering them to the stage or above and also dropping out of sight in front to reappear again in the back, just as effectively.
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Underneath the Orchestra Lift at the Radio City Music Hall
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2001
Fall 2010 | Volume 25, Issue 3
One morning in April 1938, 27-year-old DuPont chemist Roy J. Plunkett cracked open the valve of a pressurized canister containing tetrafluoroethylene (TFE) gas in preparation for an experiment. Much to his irritation, the canister that he had filled the night before appeared to be empty. His…
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Fall 2010 | Volume 25, Issue 3
In 1933 the 68-year-old inventor Niels Christensen finally tackled a problem that had bothered him throughout his long career in hydraulics. His elegant and simple solution—the O-ring—would become such a ubiquitous part of so many technologies that it is present by the dozens in every home and car…
Fall 2010 | Volume 25, Issue 3
Early in 1924, 34-year-old Edwin Armstrong returned to Columbia University, the scene 11 years earlier of his breakthrough invention of the regenerative circuit, while only a sophomore. His device had amplified radio waves a thousandfold and made radio practical. This time he had set his sights on…
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Fall 2010 | Volume 25, Issue 3
Serial doodler, drafter, and brainstormer, New Hampshire–born Earl S. Tupper was an inventor obsessed with improving everyday household objects. His rough sketches, scrawled with a fountain pen over rapidly yellowing notebook paper, include an eyebrow shield to allow more precise penciling;…
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Summer 2010 | Volume 25, Issue 2
For 12 million years it trickled, meandered, and snaked, before bursting violently loose to slash to its final destination. Then, one winter day in 1935, this ancient, tempestuous journey abruptly ended in a remote canyon as the last of more than 5 million buckets of concrete was poured onto the…
