Loch Etive is a Scottish sea inlet or fjord north of Oban in the Highlands.
Back in the 19th Century it was decided to extend the railway from Oban northwards and the big issue was whether to go round Loch Etive or across it. Unlike other lochs it had a shallow part at a place called ‘The Falls of Lora’. The name was apt as when the tide comes out of the loch it produces a standing torrent of water.
The engineers (John Wolfe Barry and partners) knew it would be too difficult to place any part of a bridge directly in that part of the loch, so needed to come up with a different, not too expensive solution for the trains to cross. They decided on a single span cantilever action bridge made from steel.
What is a cantilever bridge? The most famous example then and still with us is the Forth Rail Bridge, also in Scotland, for which the huge amounts of steel were supplied, like at Loch Etive and Tower Bridge, by William Arrol and Company of Glasgow.
The Forth Rail Bridge was over-specified due to the high winds in the wide sea estuary where it was located – by contrast the bridge over Loch Etive would shorter and could be based on a simpler design, but using the same cantilever principle. The rising bascule leaves on Tower Bridge also acted as movable cantilevers, extending out from the tower bases to meet in the middle of the River Thames.
When the Connel Ferry Bridge was completed in 1903, it became the world’s longest single span cantilever bridge (the Forth Rail Bridge had double spans!). It was soon taken over by other bridges, but I feel it set a precedent and it is still with us now for road traffic only.
This is the first post in a series of 10 favourite structures featured in the book ‘Building Passions’ by Nick von Behr. The 11th post will try to rank the structures in order of appeal.
I was hoping to publish my forthcoming book about JWB, his family and close friend Henry Brunel, son of IKB, by now. It will happen by the end of September latest.
The good news is that I have had more time to adjust my text to address a broader readership and write more about the famous Brunel family. While the Barrys rightly got the credit for Tower Bridge and the Houses of Parliament, they couldn’t have achieved this without the legacy and contribution of others.
In addition to the Brunels the book covers Augustus Pugin and a little on his father, from whom he inherited his incredible gothic drawing talents. It also looks at William Arrol’s contribution to the building of Tower Bridge and the more structurally impressive Forth Railway Bridge.
Which shows that there are stories behind stories behind stories. Meeting recently with former work colleagues, providing the ‘back story’ to key issues was one area we felt had been part of our career learning.
The trick is to find the key stories, dig up enough relevant detail and communicate this to your intended audiences.
There are plenty of students out there who don’t fully understand their university and career options. In many cases this may be fine, but for some it could also mean the difference between a happy life and one where you are struggling to find your niche.
My major piece of careers advice to anyone considering their employment choices is to use any reasonable and ethical means available to find out the truth about a profession – this may include becoming a member of a body or tracking down and speaking directly to graduates and apprentices within a sector. Fortune favours the brave and employers will reward initiative with an opportunity to prove yourself.
Finally, there are always second chances and I am currently grasping one for myself by writing my first book much later than I had hoped to. This won’t be my sole occupation but an important part of who I am. It took me a long time to get here but it has been worth it.
NB: the image of the Forth Rail Bridge in this post reflects one of the banner images on the IStructE’s new website and is the iconic 19th Century structure built from the same Arrol steel used on Tower Bridge.
As blogged before, next summer will mark 125 years since Tower Bridge was opened.
I’ve added a couple of extra pages to this site which is about the man who built the bridge. The first is on how John Wolfe Barry persuaded Parliament to approve the plans for a bascule bridge across the Thames. The second covers the pivotal role of William Arrol in manufacturing and installing the steel framework for the towers that supported the huge bascules. I will add further pages as we get closer to the date.
You can also keep an eye on Tower Bridge’s own plans at its Facebook page and via its Twitter handle @towerbridge .
At least one new book about the history of the bridge will be published, but in the meantime you can read Honor Godfrey’s excellent softback of 1988 through library loans or Amazon.
There are 13 days until we commemorate the death of Sir John Wolfe Barry, one hundred years ago.
The play on words in the title of this blog is obviously to do with the number thirteen, but also allows me to tell you a bit about Sir Benjamin Baker.
Baker was a close friend and business associate of Wolfe Barry and like John was also President of the Institution of Civil Engineers. He is most famous for designing and building between 1883 and 1890 with Sir John Fowler the iconic Forth Rail Bridge in Scotland, which still stands and functions as it was intended.
The steel for the bridge was supplied by William Arrol, who also provided the steel for Tower Bridge and the Connel Bridge, both built by Wolfe Barry.
Benjamin Baker went on to design and construct a number of docks with Sir John including the Royal Edward at Avonmouth near Bristol. Subsequently he built the new Aswan Dan in Egypt to tame the Nile, no doubt well informed about the nature of river currents and movement of sediment.
Like Barry, Sir Benjamin has a stain glass window commemorating him in Westminster Abbey.