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Showing 102 results for Fresnel lens ...

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Fire Island National Seashore

Fire Island Light Station Fresnel Lens Building

• Type: Place

An exciting piece of history, this building houses the original first order Fresnel Lens which once illuminated the Fire Island Lighthouse

Indiana Dunes National Park

Harriet Colfax

• Type: Person

Born along the St. Lawrence River, determined Harriet Colfax found herself far upstream along the treacherous coast of Southern Lake Michigan after moving to a young Michigan City in 1853. For 43 careful years she watched the rough frontier city blossom to a Duneland metropolis; she fearlessly maintained the harbor beacon as lighthouse keeper while enduring the ensuing hardships with her lifelong companion Ann Hartwell.

Longfellow House Washington's Headquarters National Historic Site

Boston Marriages

• Type: Article

Longfellow’s writing, and that of members of his social circle, provide contemporary audiences a lens on the history of romantic relationships between women in New England in the 1800s. Boston Marriages were a newer concept in the second half of the 1800s, owing its meaning to the women involved in them. Women in these marriages were often from New England, college-educated, financially independent, and with careers of their own.

Smoky Jack - Dogs of the NPS

• Type: Place

In 1925, Paul Adams became the caretaker of Mount Le Conte, accompanied by his loyal German Shepherd, Smoky Jack. The adventurous duo braved the Smokies together, with Smoky Jack carrying supplies, protecting Paul from danger, and even saving his life multiple times.

Boston Harbor Islands National Recreation Area

The Graves

• Type: Place

The Graves are located in the outer northeast corner of the Boston Harbor at approximately 11 miles away from Boston. Rocky outcroppings surround the island, which are 15 feet above sea level at high tide. The Graves are not open to the public as they are privately owned.

Boston Harbor Islands National Recreation Area

Boston Light

• Type: Place

Since its original establishment in 1715, Boston Light has served as an integral beacon for Boston Harbor.

“Cracking the code” on mercury bioaccumulation

• Type: Article

Read the abstract and get the link to a published paper on a model to predict mercury risk park waterbodies: Kotalik, C.J. et al. 2025. Ecosystem drivers of freshwater mercury bioaccumulation are context-dependent: insights from continental-scale modeling. Environmental Science & Technology. DOI: 10.1021/acs.est.4c07280

Yellowstone National Park

Lamar Valley - Wildlife Watching

• Type: Place

Keweenaw National Historical Park

Keweenaw County Historical Society

• Type: Place

Fort Washington Lighthouse

• Type: Place

Cape Cod National Seashore

Nauset Light

• Type: Place

Visit Nauset Light and learn more about lighthouse history!

Cape Cod National Seashore

Three Sisters Lighthouses

• Type: Place

Stop by the Three Sisters Lighthouses to learn more about lighthouse history on Cape Cod!

Golden Gate National Recreation Area

Point Bonita Lighthouse

• Type: Place

NOTE: There is limited cell service at the lighthouse. To use the app with partial functionality on-site, download the data to your phone ahead of time. To provide seafarers safe passage through the treacherous waters of the Golden Gate Strait, a network of lighthouses was built in the 1850s. The first light on Alcatraz illuminated the path for ships directly in front of Golden Gate, while the second light at Fort Point marked the bay's southern edge.

Fort Vancouver National Historic Site

Working Women at Vancouver's Kaiser Shipyards

• Type: Article

Discover the history of women workers at Vancouver, Washington's Kaiser Shipyards through the lens of Fort Vancouver National Historic Site's collection of historic Bos'n's Whistle magazines.

Mellon Humanities Postdoctoral Fellowship Program

The Castle and the Clock Tower: Understanding Industrialization Through the Gothic

• Type: Article

Explore the evolution of factory life in Lowell through the lens of Gothic fiction. Gothic writers reflected widespread fears related to the rise of industrial labor, and for readers like the Lowell “mill girls,” Gothic tales resonated with the harsh realities of factory work, offering a lens through which to understand the anxieties of the time.

Sleeping Bear Dunes National Lakeshore

South Manitou Lighthouse Complex

• Type: Place

For nearly a century, lighthouse keepers kept a light burning at the top of this 104 foot tower to guide mariners through the dangerous Manitou Passage.

Cane River Creole National Historical Park

Two Worlds

• Type: Place

Boston Harbor Islands National Recreation Area

Graves Light

• Type: Place

The Graves are located in the outer northeast corner of the Boston Harbor at approximately 11 miles away from Boston. Rocky outcroppings surround the island. They sit at 15 feet above sea level at high tide, making them a dangerous peril to passing ships.

Pictured Rocks National Lakeshore

Au Sable Light Station Wayside

• Type: Place

Au Sable Light Station wayside. Located at the end of the Light Station Trail.

Redwood National and State Parks

Project Profile: Restoring Iconic Redwood Forests and Watersheds

• Type: Article

The National Park Service is set to bolster landscape-scale restoration efforts in Redwood National and State Parks, specifically targeting the Prairie Creek watershed.