Free Presentations in PowerPoint format

What, Where, and Why: Lighthouses

History: Lighthouse at Alexandria (7 wonders of the ancient world)

History: Colonial Lighthouse Keeper

Then and Now: The United States Lighthouse Service

Lighthouses

Powerpoint about where lighthouses are found and why 
(sign up and materials are free) 

Lighthouses and Marine Navigation

The Fresnel Lens

See Also: The US Coast Guard, Light & Optics 

For Kids