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The walled city of Galway. | 0:00:34 | 0:00:36 | |
There's nothing between here and North America, but sea... | 0:00:36 | 0:00:41 | |
An ocean of sea. | 0:00:41 | 0:00:42 | |
In the 19th century, wave upon wave of emigrants trusted their luck | 0:00:42 | 0:00:47 | |
crossing the Atlantic, to flee poverty and famine in Ireland | 0:00:47 | 0:00:51 | |
for a new life in a new world. | 0:00:51 | 0:00:54 | |
But this special relationship with America | 0:00:59 | 0:01:01 | |
goes back further than you might think. | 0:01:01 | 0:01:04 | |
90 million years ago, what's now Ireland and North America | 0:01:05 | 0:01:09 | |
were joined together. | 0:01:09 | 0:01:10 | |
Then, they began to drift apart... | 0:01:13 | 0:01:16 | |
..and the world's second biggest ocean emerged - | 0:01:17 | 0:01:21 | |
the Atlantic. | 0:01:21 | 0:01:22 | |
It dominates life on the Irish coast, | 0:01:30 | 0:01:32 | |
yet the Atlantic remains full of mystery. | 0:01:32 | 0:01:34 | |
We know more about Mars than we know about the oceans | 0:01:37 | 0:01:40 | |
and the reason for that is the vastness of the oceans. | 0:01:40 | 0:01:43 | |
They take up most of the planet. | 0:01:43 | 0:01:45 | |
They're really deep. A huge body of water. | 0:01:45 | 0:01:49 | |
I've joined James Ryan, from Galway's Marine Institute, | 0:01:49 | 0:01:52 | |
and we're out here to check on this. | 0:01:52 | 0:01:54 | |
It's a scientific buoy | 0:02:00 | 0:02:02 | |
that's processing a constant stream of information about the ocean. | 0:02:02 | 0:02:06 | |
Battered by the waves, occasionally, | 0:02:06 | 0:02:08 | |
it requires a little loving attention. | 0:02:08 | 0:02:12 | |
Oh, there we go. | 0:02:12 | 0:02:13 | |
A more physical life than I imagined for most scientists. | 0:02:13 | 0:02:16 | |
It is! This is the bit I really like - | 0:02:16 | 0:02:18 | |
get away from the desk and the computer. | 0:02:18 | 0:02:20 | |
Hanging below the buoy are data probes, to monitor temperature, | 0:02:22 | 0:02:27 | |
salt content, wave motion, nutrients | 0:02:27 | 0:02:30 | |
and even the dolphins' comings and goings. | 0:02:30 | 0:02:34 | |
Wow, beautiful. | 0:02:34 | 0:02:37 | |
So what do you have to do now that we're out here? | 0:02:37 | 0:02:40 | |
I just want to raise up the sensors, | 0:02:40 | 0:02:43 | |
-which are down at the bottom of this big pipe. -I see. | 0:02:43 | 0:02:45 | |
In order for us to check them, we have to haul them up. | 0:02:45 | 0:02:48 | |
'The underwater sensors need a clean to keep them working reliably. | 0:02:48 | 0:02:52 | |
'It means scientists can now study the Atlantic | 0:02:55 | 0:02:57 | |
'without ever leaving their desks.' | 0:02:57 | 0:03:00 | |
So it's sending its information out? | 0:03:00 | 0:03:02 | |
Sending the information, 24/7. It's sending data all the time. | 0:03:02 | 0:03:06 | |
'There are plans to install a network of these buoys, | 0:03:06 | 0:03:10 | |
'to track the progress of global warming.' | 0:03:10 | 0:03:13 | |
This is one buoy here on the edge of Ireland. | 0:03:13 | 0:03:15 | |
There are other equivalent buoys all around the world, | 0:03:15 | 0:03:18 | |
all very new technology. | 0:03:18 | 0:03:19 | |
They are, I suppose, like the heart monitor on a patient. | 0:03:19 | 0:03:24 | |
We are checking the physiology of the oceans here and monitoring it | 0:03:24 | 0:03:27 | |
at a time when it's really vital for the planet. | 0:03:27 | 0:03:30 | |
We're finally learning to cherish this precious ocean, | 0:03:30 | 0:03:35 | |
that previous generations saw as territory to be conquered. | 0:03:35 | 0:03:39 | |
Past the Slyne Head Lighthouse, our journey continues on to Clifden. | 0:03:57 | 0:04:01 | |
The first people to see this view from the air were the pioneering aviators, Alcock and Brown | 0:04:09 | 0:04:16 | |
who completed the first non-stop trans-Atlantic flight, by landing here in 1919. | 0:04:16 | 0:04:23 | |
But a few years before, this was home to another transatlantic breakthrough. | 0:04:26 | 0:04:31 | |
Dick Strawbridge is searching for its remains. | 0:04:31 | 0:04:34 | |
In its day, this was the world's biggest communications hub. | 0:04:37 | 0:04:42 | |
The brainchild of an Italian entrepreneur. | 0:04:42 | 0:04:45 | |
Just over 100 years ago, | 0:04:45 | 0:04:46 | |
this man, Guglielmo Marconi, | 0:04:46 | 0:04:48 | |
the pioneer of radio, brought his men here | 0:04:48 | 0:04:51 | |
to set up the world's first wireless telegram service. | 0:04:51 | 0:04:55 | |
We want to discover how Marconi did it. And why did he come here, | 0:04:55 | 0:04:59 | |
to this isolated peat bog on the Irish coast? | 0:04:59 | 0:05:02 | |
When Marconi arrived, his challenge was immense - | 0:05:06 | 0:05:09 | |
build the most powerful transmitter the world had ever seen. | 0:05:09 | 0:05:14 | |
Good to see you, sir. If you just want to swing around that way. | 0:05:14 | 0:05:18 | |
'I've assembled a team of experts who'll try and generate a radio signal | 0:05:18 | 0:05:22 | |
'with the same technology that Marconi pioneered here in Ireland.' | 0:05:22 | 0:05:26 | |
You want to try and align those two insulators with these two vertical members here. | 0:05:26 | 0:05:31 | |
'We've got electronics engineers from the Galway | 0:05:31 | 0:05:33 | |
'and Mayo Institute of Technology, supported by radio experts from the Irish naval service,' | 0:05:33 | 0:05:37 | |
and they're all here to unpick the puzzle that Marconi cracked in 1907. | 0:05:37 | 0:05:42 | |
Just to confirm, we have arrived at the Clifden site | 0:05:43 | 0:05:46 | |
and we're going to conduct the Marconi exercises, over. | 0:05:46 | 0:05:50 | |
Clifden's one of the closest points between Ireland and North America. | 0:05:50 | 0:05:54 | |
From here, Marconi planned to send and receive radio signals | 0:05:55 | 0:05:59 | |
a staggering 1,900 miles across the Atlantic. | 0:05:59 | 0:06:04 | |
He built a sister station at Glace Bay in Nova Scotia. | 0:06:04 | 0:06:07 | |
This was years before it was possible to transmit voice messages. | 0:06:09 | 0:06:13 | |
So he used Morse code, electronic pulses that correspond to letters of the alphabet. | 0:06:13 | 0:06:18 | |
Marconi sent the first transatlantic radio message from Poldhu at Land's End. | 0:06:20 | 0:06:26 | |
But six years later, to set up as a business, he uprooted to Ireland. | 0:06:26 | 0:06:31 | |
Marconi proved radio communications at Land's End, didn't he? | 0:06:31 | 0:06:35 | |
So why did he come to Ireland? | 0:06:35 | 0:06:37 | |
Poldhu radio site for Marconi wasn't large enough | 0:06:37 | 0:06:40 | |
for the type of antenna structure he was experimenting with. | 0:06:40 | 0:06:43 | |
Marconi was building big. | 0:06:46 | 0:06:48 | |
Here at Clifden, there was room for a huge antenna suspended on poles 200 feet high. | 0:06:48 | 0:06:55 | |
All that's left of the mighty structure are dozens of concrete anchor blocks for the masts. | 0:06:57 | 0:07:03 | |
To get some sense of the scale, I've asked our guys from the navy to act as markers. | 0:07:05 | 0:07:10 | |
See the far lad there, he's only about a third of the way? | 0:07:10 | 0:07:13 | |
Absolutely, that guy at the very top there of the hill, | 0:07:13 | 0:07:16 | |
he's one third of the way of the entire antenna. | 0:07:16 | 0:07:20 | |
This was a ginormous antenna. | 0:07:20 | 0:07:22 | |
You could say, the biggest in the world at that particular time. | 0:07:22 | 0:07:27 | |
Nothing like this had been seen before - | 0:07:27 | 0:07:29 | |
an antenna over half a mile long. | 0:07:29 | 0:07:32 | |
It would need up to 300,000 watts of power to send messages all the way across the Atlantic. | 0:07:34 | 0:07:40 | |
So Marconi had to generate lots of energy on site. | 0:07:40 | 0:07:44 | |
That's why he built a power station in the middle of a bog. | 0:07:46 | 0:07:49 | |
He had a lake, which he needed for water supply for his DC generators, | 0:07:51 | 0:07:55 | |
which were right here beside us. That's the remnants of the DC generators over there. | 0:07:55 | 0:08:00 | |
Amazingly, the generators were driven by a steam engines which burnt a traditional Irish fuel. | 0:08:00 | 0:08:07 | |
Everywhere you look, what do see? Energy - turf peat. | 0:08:07 | 0:08:11 | |
-They used peat for fuel? -Absolutely. | 0:08:11 | 0:08:13 | |
But Marconi still needed a way of storing the electrical energy | 0:08:15 | 0:08:19 | |
from his peat-fuelled generators - and releasing it rapidly. | 0:08:19 | 0:08:23 | |
The solution was to construct a capacitor, or condenser. | 0:08:23 | 0:08:28 | |
We're trying to build one like Marconi did, from steel plates. | 0:08:28 | 0:08:32 | |
Adding plates increases the electrical energy a capacitor can store. | 0:08:34 | 0:08:40 | |
Unlike a battery, it can be charged up quickly and discharged in a split second. | 0:08:40 | 0:08:45 | |
This was the key component that enabled Morse code to be received loud and clear 1,900 miles away. | 0:08:45 | 0:08:52 | |
-This is huge. -That may look huge today, but compared to Marconi, | 0:08:54 | 0:08:58 | |
this condenser, this is minute! | 0:08:58 | 0:09:01 | |
Look, have a look at that picture. | 0:09:01 | 0:09:04 | |
Have you seen this?! | 0:09:04 | 0:09:06 | |
This is a man here. | 0:09:06 | 0:09:08 | |
We're talking about each panel being 12 times bigger than that? | 0:09:08 | 0:09:11 | |
The panels at the bottom were about 12 feet, which would be | 0:09:11 | 0:09:15 | |
about three of these sheets wide, | 0:09:15 | 0:09:16 | |
and about 30 feet tall, which is between seven and eight times... | 0:09:16 | 0:09:22 | |
-25 times the size? -Absolutely. | 0:09:22 | 0:09:24 | |
-And how many did he have? -You'll not believe this. He had 1,800 sheets. | 0:09:24 | 0:09:30 | |
This condenser housing was 350 feet long and 75 feet wide! | 0:09:30 | 0:09:35 | |
We've built a Marconi-style steel plate condenser, but what about generating the radio signal itself? | 0:09:38 | 0:09:44 | |
The man with the biggest collection of early radio equipment in Britain is Bob Smallbone. | 0:09:45 | 0:09:51 | |
He's arrived with a rare and crucial bit of kit, that dates right back to Marconi's time. | 0:09:51 | 0:09:56 | |
That's cast iron, weighs a ton. | 0:09:59 | 0:10:01 | |
-1910 rotary spark gap. -We're ready to go. | 0:10:01 | 0:10:04 | |
Get it connected, good man. | 0:10:04 | 0:10:06 | |
In 1907, powering up such a rotary spark gap was no mean feat. | 0:10:06 | 0:10:11 | |
Marconi's peat-powered steam engine drove his generators. | 0:10:11 | 0:10:15 | |
We're using petrol power. | 0:10:15 | 0:10:17 | |
We should be getting, what, about 230, 240 out, 230? | 0:10:21 | 0:10:25 | |
But our generator's output is too low. | 0:10:27 | 0:10:30 | |
-I should have been expecting 220. -Yep. -OK. | 0:10:30 | 0:10:35 | |
After some tweaking, it's all systems go. | 0:10:36 | 0:10:39 | |
-That's on top. -That's it. That's 220, | 0:10:39 | 0:10:42 | |
So we're happy with that. | 0:10:42 | 0:10:44 | |
Just one more part of the circuit to complete. | 0:10:44 | 0:10:46 | |
-Bob's brought along a Morse key. -An absolute replica. | 0:10:46 | 0:10:51 | |
-So that's exactly what they used 100 years ago? -Exactly. | 0:10:51 | 0:10:54 | |
-Here in Clifden? -Here in Clifden. | 0:10:54 | 0:10:56 | |
-There you go, no expense spared today. -Let's get it wired up. -Perfect. | 0:10:56 | 0:11:01 | |
Marconi was an astute entrepreneur. He wanted to make communications | 0:11:01 | 0:11:05 | |
by wireless telegraph more accessible | 0:11:05 | 0:11:07 | |
and create a big market for his ground-breaking service. | 0:11:07 | 0:11:11 | |
-Here's an advert of the time, Dick. -The Marconi-gram! -Yep. | 0:11:11 | 0:11:15 | |
'By making messages more compact, they'd use up less air time and so it'd be a lot cheaper.' | 0:11:15 | 0:11:21 | |
Marconi's Wireless Telegraphic Code book. | 0:11:24 | 0:11:27 | |
You just use one word and he gives you a whole sentence. | 0:11:27 | 0:11:32 | |
-And those aren't real words? -No, they're not. | 0:11:32 | 0:11:34 | |
-Abrotanoid? -Abrotanoid. -Cracking word! "Bankrupt stock will realise large amount". | 0:11:34 | 0:11:38 | |
-That's a very long sentence for one word. -It is. | 0:11:38 | 0:11:41 | |
-That would cost me eight pence? -8p. | 0:11:41 | 0:11:43 | |
We're getting a feel for the challenges Marconi faced here in 1907, | 0:11:45 | 0:11:49 | |
trying to generate his revolutionary transatlantic radio messages. | 0:11:49 | 0:11:53 | |
Now, the ultimate test... | 0:11:53 | 0:11:56 | |
Frank has now got a live feed. Is anybody else worried?! | 0:11:56 | 0:12:00 | |
If you touched the steel plates now, you'd become part of a 6,000-volt circuit and almost certainly die. | 0:12:00 | 0:12:06 | |
The condenser's all wired up, which means we can store lots of energy. | 0:12:06 | 0:12:11 | |
So we need to get everybody safe, flip the switch, | 0:12:11 | 0:12:13 | |
and we'll be sending Morse a long way using our condenser. | 0:12:13 | 0:12:17 | |
-Do you want to do a quick safety check for me please, sir? -Clear the danger area, please. | 0:12:17 | 0:12:21 | |
-Can you confirm the danger area is clear? -Yes, clear. -Thank you. On my mark... | 0:12:21 | 0:12:25 | |
Five, four, three, two, one, mark. | 0:12:25 | 0:12:31 | |
You're in control. | 0:12:31 | 0:12:33 | |
CRACKLING AND BUZZING | 0:12:34 | 0:12:35 | |
Whoa! We like that! We like that! | 0:12:35 | 0:12:38 | |
We're looking good. | 0:12:38 | 0:12:40 | |
CRACKLING AND BUZZING | 0:12:40 | 0:12:43 | |
The high voltage sparks are jumping across a tiny air gap between the stud contacts. | 0:12:43 | 0:12:49 | |
When these rotating contacts line up and the Morse key is pressed, the spark creates a signal. | 0:12:49 | 0:12:56 | |
Marconi's rotary spark gap was five feet in diameter and the sound | 0:12:56 | 0:13:00 | |
of the sparks could be heard over half a mile away. | 0:13:00 | 0:13:03 | |
As well as making audible sound waves, the sparks are also creating invisible radio waves. | 0:13:05 | 0:13:11 | |
Even without connecting our scaled-down model to an antenna, | 0:13:11 | 0:13:15 | |
it's so powerful, it's actually transmitting through the air. | 0:13:15 | 0:13:18 | |
This is a radio that'll pick it up? | 0:13:18 | 0:13:20 | |
Conventional radio, set to long wave. We should be able to pick it up. | 0:13:20 | 0:13:24 | |
-If we head off, can you send us a message of some description? -I can indeed. -Excuse us. | 0:13:24 | 0:13:30 | |
SIGNALS BUZZ ON RADIO Isn't that a beautiful clean spark!? | 0:13:30 | 0:13:34 | |
We've got 100 watts in there. | 0:13:36 | 0:13:38 | |
This is still going. | 0:13:38 | 0:13:40 | |
-And there's no antenna? -Marconi had something like 100,000 watts. | 0:13:40 | 0:13:44 | |
'Our signal could be picked up almost half a mile away.' | 0:13:46 | 0:13:51 | |
Over a century ago, when Marconi launches his transatlantic wireless telegraph service, | 0:13:56 | 0:14:01 | |
it heralded the dawn of a new era of high-speed communications. | 0:14:01 | 0:14:06 | |
A big idea that made the world seem a little smaller. | 0:14:06 | 0:14:10 | |
Subtitles by Red Bee Media Ltd | 0:14:15 | 0:14:18 |