C'mon, the question wasn't up 5 minutes!!!
NO Fair! bash
Seriously Ruthie, good job!
When the original Cape Cod Light was constructed in 1797, it was thought that mariners would confuse it with Boston Light. A primitive rotating "curtain" was installed, with the purpose of covering over the light for 30 seconds to make it appear as a "flash". Never worked very well, however, and it was removed when the then brand new Winslow Lewis lamp and reflector system was installed in 1812.
You're up Ruth.

Roland Babineau
The only true Harbour Lights dealer left in the world and the ONLY retailer in the world authorized to sell Harry Hine's lighthouse collectible line!
http://www.thecapecodstore.com/harbor_lights.html