Chicago's Movable Bridges | The history of Bascule Bridges
It’s History7 Tammi 2023

Chicago's Movable Bridges | The history of Bascule Bridges

A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed. The name comes from the French term for balance scale, which employs the same principle. Bascule bridges are the most common type of movable span because they open quickly and require relatively little energy to operate, while providing the possibility for unlimited vertical clearance for marine traffic. Learn more about your ad choices. Visit megaphone.fm/adchoices

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Why Pacifica California is Falling into the Sea

Why Pacifica California is Falling into the Sea

Perched along the cliffs just south of San Francisco, Pacifica, California, was built on a dream of ocean views and quiet living. However, this dream conceals a dangerous reality. Developers initially...

2 Huhti 13min

Why NYC Built Skyscraper-Sized Sewer Tanks

Why NYC Built Skyscraper-Sized Sewer Tanks

Beneath New York City lies a 7,500-mile labyrinth that processes billions of gallons of waste daily. This underground network, built over two centuries, includes forgotten tunnels, Civil War-era infra...

1 Huhti 14min

Why Route 66’s Bridges Are Collapsing

Why Route 66’s Bridges Are Collapsing

Across the American heartland, historic bridges line the old alignment of U.S. Route 66, many abandoned for decades and at risk of collapse. This episode explores how this iconic highway became a grav...

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Why Chicago's Worst Public Housing Project became a National Disgrace

Why Chicago's Worst Public Housing Project became a National Disgrace

Cabrini-Green, once a nationwide symbol of crime and urban decay, has seen gradual demolition over the past two decades. Originally home to 15,000 residents, the complex has transitioned into new reta...

29 Maalis 19min

Why Coal Breakers were Horrific Places to Work (Coal Breakers Explained)

Why Coal Breakers were Horrific Places to Work (Coal Breakers Explained)

Coal breakers were essential machines in coal mines, responsible for breaking large chunks of coal into smaller pieces. They were the heart of the operation, despite being loud and dirty, requiring si...

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Why Hundreds of New York Ships were Abandoned on Staten Island

Why Hundreds of New York Ships were Abandoned on Staten Island

The Staten Island Boat Graveyard, located at 2453 Arthur Kill Road in Rossville, has roots dating back to the 1930s and has been known as the Witte Marine Scrap Yard and Arthur Kill Boat Yard. Now ref...

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Why America's Battleship Graveyard is Forgotten (Philadelphia's Abandoned Ships) - IT'S HISTORY

Why America's Battleship Graveyard is Forgotten (Philadelphia's Abandoned Ships) - IT'S HISTORY

Explore the battleship graveyard outside the Philadelphia International Airport, featuring storied vessels that once served in the United States Navy. This video highlights the fates of legendary ship...

26 Maalis 24min

What’s 1,000 Feet Underground in a Medieval Salt Mine?

What’s 1,000 Feet Underground in a Medieval Salt Mine?

Buried nearly 1,000 feet beneath southern Poland lies the Bochnia Salt Mine, one of Europe's oldest salt mines and a UNESCO World Heritage site with a history spanning nearly 1,000 years. This sprawli...

25 Maalis 28min

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