How did one clock save lives?

Arrr, mateys! Did you know sailors used to get totally lost at sea? Imagine sailing for weeks and having no idea where you are! It was the biggest puzzle of the 1700s, and it cost thousands of lives!

Meet John Harrison, a carpenter who never went to fancy schools but decided to solve this HUGE problem. He spent his whole life building a special, super-accurate clock—the marine chronometer—that could keep time perfectly even on a rocking boat!

But wait, the stuffy scientists wouldn't believe him! John had to fight for 40 years to prove his genius clock worked! Tune in to hear the dramatic story of how one determined man and his incredible invention changed sea travel forever, just in time for the 250th anniversary of his passing! Get ready for history that's definitely NOT boring!

Transcript

SPEAKER_01 0:00

Welcome to History's Not Boring by Kidopoly.com. I'm Mira. And I'm Finn. Finn, did you know that right now, about 250 years ago, the world was a giant guessing game for sailors? A brilliant carpenter who never went to a fancy school basically solved the hardest science problem of the age. It was so hard it cost thousands of lives.

SPEAKER_00 0:26

Thousands of lives? That sounds really sad. Wait, are we talking about a brave hero, Mira?

SPEAKER_01 0:34

We absolutely are! We're talking about John Harrison, the man who built one little clock that changed all of navigation forever. Stick around, because this story is all about finding out exactly where you are in the giant, wide ocean. Okay, imagine this. You are on a ship in 1700. You can tell how far north or south you are, which is called latitude, just by looking at the sun or the north star. That part is easy.

SPEAKER_00 1:05

Like using a map to see if we're near the top or the bottom of the world.

SPEAKER_01 1:09

Exactly. But the really hard part was knowing how far east or west you were, which is called longitude. If you sail from London, England, to a port in the Caribbean, you might miss it by hundreds of miles.

SPEAKER_00 1:23

Whoa, missing the land? That sounds terrifying. Where exactly would we end up if we were lost by, say, a hundred miles?

SPEAKER_01 1:32

If you were off by a tiny bit, you could crash into rocks or just run out of supplies. Over centuries, it's estimated that hundreds of thousands of sailors and ships were lost because of this longitude problem. That's why in 1714, the British government, right after a terrible shipwreck called the Silly Naval Disaster, where over 1,500 sailors died, offered a massive reward.£20,000.

SPEAKER_00 2:02

£20,000? That's like a mountain of money. Who were the smart people trying to solve it? The smartest astronomers.

SPEAKER_01 2:11

Like Edmund Halley. Yes, the Halley of the Comet. Thought the answer was in the stars or the moon. But our hero wasn't an astronomer. He was John Harrison, born in 1693 in Yorkshire, England. He was a carpenter and clockmaker, with no fancy university degree.

SPEAKER_00 2:30

A carpenter? So he built things with wood? How can a woodworker solve a sea puzzle?

SPEAKER_01 2:36

He had a genius for mechanics, and noticing how temperature and dampness made wood expand and shrink. He knew that to find longitude, you needed a clock that kept perfect time, no matter what. The sea is rough. Waves crash, the ship pitches, and regular clocks would slow down or speed up.

SPEAKER_00 2:57

Right, if my toy car stops every time I go over a bump, it's useless. So what did John build first?

SPEAKER_01 3:05

He started with H1, his first major try, in 1735. It was huge, weighing about 75 pounds, and it used huge wooden wheels he carved himself. It didn't use a regular pendulum. It used two connected, slow-swinging rods to fight the rocking of the ship.

SPEAKER_00 3:26

75 pounds? That's like carrying three big fifth graders. Did it work on the ocean?

SPEAKER_01 3:33

It was tested on a trip to Lisbon, Portugal, and it was incredibly accurate, losing only about 5.6 seconds over 29 days. But the scientists on the board of Longitude, who were mostly astronomers, weren't impressed enough. They said it wasn't proven over the really long distance needed, like sailing to the West Indies.

SPEAKER_00 3:56

Oh, that's so unfair! He did the hard part. What was his next idea?

SPEAKER_01 4:01

He kept improving. H2 was still big, but then came H3, which finally used metal, not wood, for the sensitive parts, making it much more durable. But the real game changer was H4, finished around 1759. It looked like a small, round pocket watch, only about five inches wide.

SPEAKER_00 4:25

Five inches? That's smaller than my dinner plate. So this little watch was going to prove the scientists wrong.

SPEAKER_01 4:32

It took a long time. It wasn't until 1761 that Harrison, who is now 68 years old, got his chance with H4 on a voyage to Jamaica. The trip took 156 days, sailing thousands of miles across the Atlantic Ocean.

SPEAKER_00 4:51

Wow, 156 days? That's longer than a whole school year. Did the little watch break? It performed amazingly.

SPEAKER_01 5:00

When they finally checked the time against the known longitude in Jamaica, H4 was only wrong by about 5.1 seconds. That meant the ship's position was off by less than 1.25 miles.

SPEAKER_00 5:15

That tiny error rate was way better than anything else. Less than a mile? Mira, that's like being off by the length of just a few football fields. So he won the£20,000.

SPEAKER_01 5:28

Not exactly. The Board of Longitude was still resistant. They said they couldn't believe a simple clockmaker beat their complex astronomical calculations. They made him give H4 to a scientist to test again on another trip.

SPEAKER_00 5:46

No way! That's just not fair! What did the scientist do?

SPEAKER_01 5:50

The scientist, Neville Muskelin, who was later the Astronomer Royal, kept the clock for a long time and didn't want to admit it worked perfectly. Harrison actually had to appeal directly to King George III in 1763. It took him over 40 years from his first design to finally receiving most of the prize money and recognition.

SPEAKER_00 6:15

40 years! I can't imagine waiting that long for someone to say, yes, you were right. Did he ever get the whole thing?

SPEAKER_01 6:23

He received most of the money, and before he died in 1776, the government gave him the final payment and an official title. Longitude Board's Watchmaker. It shows incredible courage to keep going when everyone doubts you for that long. The impact was massive. His invention, the marine chronometer, made sea travel safe and predictable. Before H4, a voyage from England to North America could take 60 to 90 days, often with huge risks. After, voyages became faster and far more reliable. It opened up global trade and exploration in a way nothing else could.

SPEAKER_00 7:08

So that one clock made the whole world feel smaller because people weren't scared of getting lost anymore.

SPEAKER_01 7:15

Exactly! That's the cause and effect. Now for some whoa facts. Did you know Harrison's final, most advanced marine clock, H10, which was finished long after, was actually small enough to fit in his waistcoat pocket. It was a masterpiece of engineering.

SPEAKER_00 7:34

A pocket watch that could cross oceans. That's better than any superpower. What else?

SPEAKER_01 7:40

His very first device, built when he was just 22, was a temperature-regulating pendulum for a grandfather clock, using wood and brass, so that temperature changes wouldn't affect the time. He was thinking about accuracy before he was even 25 years old.

SPEAKER_00 7:57

He was trying to fix clocks before he even tried to solve the ocean problem. So what about the scientists? Did they ever say sorry?

SPEAKER_01 8:06

Well, the Board of Longitude accepted the science, but Harrison's legacy is that he proved a dedicated craftsman. Driven by seeing the real world suffering at sea, could outthink the most educated experts. Alright, Finn, quiz time. Are you ready to see what you remember about the amazing carpenter John Harrison?

SPEAKER_00 8:26

Okay, I'm ready. I hope I get the one about the money right.

SPEAKER_01 8:33

First question. What was the massive monetary reward offered by the British government for solving the longitude problem? Next one, this is about timing. In what year was John Harrison born? Question three. What famous celestial object is the astronomer Edmund Halley known for? Here's number four. What was the name of John Harrison's tiny successful clock that travelled to Jamaica? Last question. If a ship was lost due to an error of only 5.1 seconds on Harrison's clock, approximately how far off course would they be? Great job thinking through those tough facts. Let's see how you did. The first answer is£20,000, which was a huge amount of money back then. For question 2, John Harrison was born in the year 1693. Number three, the answer is Halley's Comet. Question 4's answer is H4. And the final answer is only about 1.25 miles off course.

SPEAKER_00 9:54

Wow, I can't believe a carpenter beat all the fancy scientists. He was so patient waiting for that money.

SPEAKER_01 10:01

Me neither, Finn. John Harrison showed us that sometimes the best ideas come from people who just look at a problem with fresh eyes.

SPEAKER_00 10:10

It's such an inspiring story of sticking with it for 40 years. It makes me want to go tell everyone. If you loved learning about John Harrison and his amazing clock, please ask a grown-up to give us a five-star review. It really helps other kids find stories about heroes like him.

SPEAKER_01 10:28

That's right. Just open up your favourite podcast app, find us and tap those five stars. While you're thinking about cool history, head over to our site, kidopoly.com. We have tons of fun learning games and activities based on stories just like this one.

SPEAKER_00 10:48

And if you have a question about clocks or what you want us to talk about next, send an email to hello at kidopoly.com. We read every single one.

SPEAKER_01 10:58

Thanks for travelling through time with us today. Bye.