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One of them is optical rotation. Optical rotation means the the plane of polarization of a linearly polarized light beam rotates as it passes through an ...

Due to the potential for mercury poisoning, Doran is one of the few people still allowed near the top of the lighthouse.

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"They were made to last," he said. "To have one still running today is just very precious and they will last for centuries, if they're preserved properly."

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The spacing of that signal is what lets crews know they're nearing Cape Race; different lighthouses flash at different rates.

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The glass lens is floated on about seven gallons of mercury — now known to be a highly toxic heavy metal — according to Doran.

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In all those years, the same intricate system has served as the guiding light, much the same as when it was first built in 1907.

"When you're up there during the day with the sun reflecting through the glass there, you can see the prisms in the light," he said. "Almost like a rainbow effect to it, but the view up there is just wonderful."

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The original light source in the existing lighthouse was a petroleum vapour light, which was replaced with a single bulb when the station was electrified in 1928.

For more than 110 years, the lighthouse at Cape Race on Newfoundland's Southern Shore has been the first, or last, beacon ships see as they cross the Atlantic Ocean.

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Other than at Cape Race, the massive lenses can be found in Portugal, Brazil, Hawaii, Pakistan, Scotland, Ireland and the Faroe Islands.

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Doran said the system requires little maintenance, but he's taken training courses and wears specialized gear to oil parts.

But the lens hasn't changed, Doran said, and it continues to help the light beam bright and steer ships to safety, as intended all those decades ago.

The gigantic caged light at the top of the 95-foot tower is the only one of its kind still used in Canada, says Tim Nguyen, who specializes in restoring and preserving lighthouses.

The scale of the Cape Race optic system can be seen in an undated photo supplied by Nguyen. The photo shows the glass lens towering over a man standing shorter than the system's brass base.

Katie Breen makes video content for CBC in St. John's. She's been working in news for 10 years. You can reach her at katie.breen@cbc.ca.

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"It's quite significant to preserve it at all cost," Nguyen said, estimating a replica would run tens of millions of dollars and wouldn't be feasible to build today.

The entire system weighs 20 tons, but because the lens sits on a mercury bath, it takes just a quarter-horsepower motor to revolve the lens around the single stationary bulb inside, Doran said.

Hyper-radial lenses were first built in 1885 and the one at Cape Race was installed in 1907 and constructed by English company Chance Brothers. Newer technology made the intricate lens design obsolete soon after.

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The lens works "just like a huge magnifying glass," said Nguyen, who runs the Australian-based company Chance Brothers Lighthouse Engineers.

Mistaken Point Cape Race Heritage Inc. says between 1866 and 1904 — when a previous model of lighthouse was used at the site — 94 ships carrying 2,000 people were lost at, or near, Cape Race.

According to Nguyen, only 33 hyper-radial Fresnel lenses — like the one at Cape Race — were ever built. Just a dozen are still in operation worldwide, and Newfoundland has the only one in Canada.

"It says on it, it can be seen up to 24 nautical miles, but a lot of good captains are after spotting it, on a clear winter's night, up as far as 50 miles out at sea," said Doran.

Aug 30, 2022 — Microscopes enlarge, or magnify, the image of an object. Light microscopes combine the magnification of the eyepiece and an objective lens.