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The day the teenagers turned on Topshop: Laurie Penny reports

What has been stolen from this angry generation? Hope.

Oxford Street at Christmastime is a special hell, and the last Monday in November is no exception. Grim-faced shoppers mummified in winter coats shove their way down freezing pavements to do their duty to the market, while a panopticon of corporate-sponsored festive lights glares down from slate skies. With no warning, a hundred young protesters pour across the road holding banners and whistles. The children of Britain are leading the consuming classes to mutiny.

These young activists are the same students and school pupils who were kettled in central London on 24 November after demonstrating to protect higher education. They have not gone away. They come from the buses and the Underground, pouring out of the backstreets in twos and threes, chanting: "No ifs, no buts, no education cuts!" The target is the flagship store of Topshop, the global byword for successful British commerce, owned by Philip Green, billionaire and business adviser to the Prime Minister.

When we were young, this world-famous, multilevel store, with its blaring music and cool-looking young employees, was an Aladdin's cave of consumer delights and cutting-edge fashion. Now, however, the sales tags have fallen from our eyes. "Philip Green's taxation could pay for our education!" the protesters chant, accessorising their woollies with clashing orange bandanas, two fingers stuck up at the matchy-matchy aesthetic of the Kate Moss display. "Please occupy Topshop for us," whispers a young shop assistant with exciting, angular hair. "We're right behind you."

Green revolution

This youth movement isn't just about university fees - it's about challenging a political class that systematically gives the needs of the market greater priority than the people, offering tax breaks for big businessmen while ripping the heart out of education and social security.

Britain's child crusaders are beginning to win the argument, the raw edge of their righteous indignation slicing through the semiotic debris of state propaganda. Messages of solidarity come from all sections of the public - from parents, teachers, social workers and even police officers. Teenagers who came to buy novelty tights and lip gloss toss their bags down and join the protest.

When the demonstration ends, we march back to the student occupation at University College London, a welcoming space where smiling people hand out cups of tea and draw up well-being committees. These kids are savagely organised. Watching them plan their next action, I feel that someone really ought to have warned David Cameron not to underestimate the bloody-mindedness of British youth. These young people are angry. They are angrier than anyone could have anticipated.

What has been taken from them to make them so angry? Hope, that's what. Hope, and the fragile bubble of social aspiration that sustained us through decades of mounting inequality; hope and the belief that if we worked hard and did as we were told and bought the right things, some of us at least would get the good jobs and safe places to live that we'd been promised.

Hope was the emotional engine of a decade of dizzying economic growth. Now it's gone. Thatcher and Reagan knew you couldn't take away hope altogther, which is why they replaced the politics of collective bargaining with a cynical, but seductive, politics of aspiration and individualism. The coalition has forgotten that it's not enough for millionaire politicians to preach the politics of austerity when all they have to offer is more austerity.

Back on Oxford Street, as the police vans scream into view, the children's crusade stands firm. "They want to marketise our education," says Ben, 21, his breath clouding in the bitter air. "So we're going to educate their market."

Laurie Penny is a contributing editor to the New Statesman. She is the author of five books, most recently Unspeakable Things.

This article first appeared in the 06 December 2010 issue of the New Statesman, Vietnam: the last battle

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Inside Big Ben: why the world’s most famous clock will soon lose its bong

Every now and then, even the most famous of clocks need a bit of care.

London is soon going to lose one of its most familiar sounds when the world-famous Big Ben falls silent for repairs. The “bonging” chimes that have marked the passing of time for Londoners since 1859 will fall silent for months beginning in 2017 as part of a three-year £29m conservation project.

Of course, “Big Ben” is the nickname of the Great Bell and the bell itself is not in bad shape – even though it does have a huge crack in it.

The bell weighs nearly 14 tonnes and it cracked in 1859 when it was first bonged with a hammer that was way too heavy.

The crack was never repaired. Instead the bell was rotated one eighth of a turn and a lighter (200kg) hammer was installed. The cracked bell has a characteristic sound which we have all grown to love.

Big Ben strikes. UK Parliament.

Instead, it is the Elizabeth Tower (1859) and the clock mechanism (1854), designed by Denison and Airy, that need attention.

Any building or machine needs regular maintenance – we paint our doors and windows when they need it and we repair or replace our cars quite routinely. It is convenient to choose a day when we’re out of the house to paint the doors, or when we don’t need the car to repair the brakes. But a clock just doesn’t stop – especially not a clock as iconic as the Great Clock at the Palace of Westminster.

Repairs to the tower are long overdue. There is corrosion damage to the cast iron roof and to the belfry structure which keeps the bells in place. There is water damage to the masonry and condensation problems will be addressed, too. There are plumbing and electrical works to be done for a lift to be installed in one of the ventilation shafts, toilet facilities and the fitting of low-energy lighting.

Marvel of engineering

The clock mechanism itself is remarkable. In its 162-year history it has only had one major breakdown. In 1976 the speed regulator for the chimes broke and the mechanism sped up to destruction. The resulting damage took months to repair.

The weights that drive the clock are, like the bells and hammers, unimaginably huge. The “drive train” that keeps the pendulum swinging and that turns the hands is driven by a weight of about 100kg. Two other weights that ring the bells are each over a tonne. If any of these weights falls out of control (as in the 1976 incident), they could do a lot of damage.

The pendulum suspension spring is especially critical because it holds up the huge pendulum bob which weighs 321kg. The swinging pendulum releases the “escapement” every two seconds which then turns the hands on the clock’s four faces. If you look very closely, you will see that the minute hand doesn’t move smoothly but it sits still most of the time, only moving on each tick by 1.5cm.

The pendulum swings back and forth 21,600 times a day. That’s nearly 8m times a year, bending the pendulum spring. Like any metal, it has the potential to suffer from fatigue. The pendulum needs to be lifted out of the clock so that the spring can be closely inspected.

The clock derives its remarkable accuracy in part from the temperature compensation which is built into the construction of the pendulum. This was yet another of John Harrison’s genius ideas (you probably know him from longitude fame). He came up with the solution of using metals of differing temperature expansion coefficient so that the pendulum doesn’t change in length as the temperature changes with the seasons.

In the Westminster clock, the pendulum shaft is made of concentric tubes of steel and zinc. A similar construction is described for the clock in Trinity College Cambridge and near perfect temperature compensation can be achieved. But zinc is a ductile metal and the tube deforms with time under the heavy load of the 321kg pendulum bob. This “creeping” will cause the temperature compensation to jam up and become less effective.

So stopping the clock will also be a good opportunity to dismantle the pendulum completely and to check that the zinc tube is sliding freely. This in itself is a few days' work.

What makes it tick

But the truly clever bit of this clock is the escapement. All clocks have one - it’s what makes the clock tick, quite literally. Denison developed his new gravity escapement especially for the Westminster clock. It decouples the driving force of the falling weight from the periodic force that maintains the motion of the pendulum. To this day, the best tower clocks in England use the gravity escapement leading to remarkable accuracy – better even than that of your quartz crystal wrist watch.

In Denison’s gravity escapement, the “tick” is the impact of the “legs” of the escapement colliding with hardened steel seats. Each collision causes microscopic damage which, accumulated over millions of collisions per year, causes wear and tear affecting the accuracy of the clock. It is impossible to inspect the escapement without stopping the clock. Part of the maintenance proposed during this stoppage is a thorough overhaul of the escapement and the other workings of the clock.

The Westminster clock is a remarkable icon for London and for England. For more than 150 years it has reminded us of each hour, tirelessly. That’s what I love about clocks – they seem to carry on without a fuss. But every now and then even the most famous of clocks need a bit of care. After this period of pampering, “Big Ben” ought to be set for another 100 or so years of trouble-free running.

The Conversation

Hugh Hunt is a Reader in Engineering Dynamics and Vibration at the University of Cambridge.

This article was originally published on The Conversation. Read the original article.