I fell in love during my research trip. Not with Roland, which was already a given. No, I fell in love with the Fresnel lenses still in use in some lighthouses today.1
Fresnel lenses are not lights themselves but are made up of hundreds of pieces of specially cut glass surrounding a lamp. Their role is to reflect and magnify the light shining inside, making it visible for miles. And they are beautiful.
The closest I can come to
showing you their beauty is to provide some photographs, but even those are woefully
inadequate. The photo at the top of this page is a 4th Order lens in
the museum at Beavertail Light in Rhode Island.
Fresnel lenses are graded
by size, with 1st Order lenses beging the largest and 6th
Order lenses the smallest, as you can see in the second photo. I have never
seen a 1st Order lens, which is big enough for a man to walk inside,
but we did see a 2nd Order lens at the Maine Lighthouse Museum in
Rockland. That’s the third photo.
The remaining two lenses are
shown in their natural habitats. The fourth photo is the Sixth Order lens at
Rose Island Light in Rhode Island, where we got to climb to the lantern room.
The final is another 4th Order lens, this time seen from below at Pemaquid
Point Lighthouse in Maine.
But the question I’m
posing in this post, and the one I’m struggling with right now, is how to
describe the indescribable. Even the photos don’t do Fresnel lenses justice, so
words never will. Still, there are times when a writer has to try. Here is my
poor attempt to show my protagonist’s reaction the first time she climbs the
tower and sees the lens.
Jessie couldn’t stop staring at the shimmering glass object in
the center of the room. Beehive-shaped and almost as tall as Dad, it was
prettier than any jewel she had ever seen.
“Is that the light?” she asked.
“No. The light comes from a lamp inside. This is a third
order Fresnel lens that reflects and magnifies the light.”
Jessie could have looked at it forever.
This is just the first
draft, so maybe I’ll be able to come up with a better description before I
finish the book.
But it still won’t come
close to describing the indescribable.
__________
1 So where did
Fresnel lenses come from? In the early 1800s, a French committee was formed to
study improvements in lighthouse illumination. One of the committee members was
Augustin Fresnel, whose design was adopted all over the world. For more
information on the history and operation of Fresnel lenses, see the National
Park Service article at www.nps.gov/articles/fresnel-lens.htm.
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