Determination and optimism mingle in Tahrir Square

Looking ahead to the first anniversary of the Arab Spring, Egyptians hope to finish in 2012 what the

"2011 ended honestly," says Khalid Abdalla, a 31 year-old British-Egyptian filmmaker and activist, about the New Year's Eve celebrations on Tahrir Square. "It felt balanced: an appreciation of what we have achieved over the year and what there is still to fight for, a sense of mourning over the cost."

The price Egyptians paid for the last year of revolution is astonishing. 2011 saw almost 2,000 protesters killed and 12,000 face illegal military trials, as well as a loss of 32 per cent of Egypt's tourist trade and an estimated $10 billion dollars of the country's money.

The revolutionaries are still pushing for the changes they demanded back in January. The government is no rush. Prime Minister Kamal El-Ganzouri even said in a press conference last week, "for a country that was silent for 60 years, why are we pressing ourselves over five or six months?"

As Egypt moves into 2012, emergency law is still in place, there is no president, no constitution and the military, led by Supreme Council of the Armed Forces (SCAF), is in power. There has been no reform of the police force, whose brutal behaviour towards civilians sparked the revolution. Little legislation has changed.

The ongoing elections, which saw violence, vote-buying, stolen ballot papers and illegal campaigning, will produce a parliament with no legislative powers that is overseen by the SCAF. Judging by the electoral results so far, this will also be a predominantly Islamist People's Assembly, even though no party was allowed to have a religious basis.

The military continue to authorise increasingly violent crackdowns. During the closing months of 2011 they used live ammunition, brutal beatings, sexual assault, tear gas and rocks against civilians in battles which stretched over five days. In November they resorted to walling protesters into Tahrir using concrete blocks to build barricades on its surrounding streets.

Even though Mubarak and a handful of his cronies are facing trial, the financial and political infrastructure of the regime is still very much in place. But yet they feel hope, people said during the New Year's Eve celebrations on Tahrir Square.

"I believe it's a duty to be optimistic," says Khalid, who has been documenting the revolution since January.

"It was very uplifting," adds Ghada Shahbender, from the Egyptian Organisation of Human Rights who was also on the square that night. She likened the gathering to the initial 18 days of revolution: "It was the first fully festive assembly in Tahrir since 18th February, a week after Mubarak stepped down."

The square was lit up with candles and fireworks. Christians and Muslims gathered around protest tents on the central roundabout wearing homemade party hats. Families held posters of their loved ones lost in the year's numerous battles. Balloons in the Egyptian flag colours were released into the night sky.

Revolutionary singers such as Ramy Essam, who was imprisoned and tortured in March 2011, sang against the military, Coptic hymns came from a nearby church and a Sufi singer performed for the crowds.

Muddled with these messages of hope was the quiet acknowledgement that this year is sure to be harder.

"We will have a bigger fight than last year. We have a long way to go, " admits Amani, 54, a Christian researcher who also celebrated New Year on the square. She talked about the 9 October Copt-led demonstration at Maspero where the army killed 27 Christian and Muslim protesters. "The religious 'differences' are all politics. The government wants us to be divided. We will win."

"The military are not backing down," agrees Omar, 42, a musician and producer, "They have regularly escalated events and have repeatedly antagonized otherwise peaceful demonstrators."

It is clear when you talk to protesters they are mentally preparing to lose their lives in 2012. There will be more blood, many say.

"They will attack us but we will keep fighting," explains Ramy Essam, who has been nicknamed the singer of the revolution, "What I hope is people will go to the streets in January, stay and make a sit-in in every square in Egypt until change happens."

Although the international media focuses on these squares, last week's riot-police raids on nongovernmental organisations illustrated there are many frontlines of this revolution.

"The authorities try to stop our work because these organisations have succeeded in winning in court against the ruling military council," explains Khalid Ali, a prominent lawyer and director of Egyptian Centre for Economical and Social Rights, who fears further attacks.

"We speak about their crimes so they want to shut us up" adds Ghada.

The Internet has been another battleground this year. Bloggers like Maikel Nabil and Alaa Abd el Fattah have been imprisoned for the blog posts they write. Even the aged military council got involved by issuing communiqués via its Facebook page.

"Citizen journalism is also going to be increasingly vital as people recognise it as a tool of civil engagement," explains Khalid who is part of a media collective Mosireen. Mosireen collects and compiles footage from protests and disseminates the short clips via the Internet, which often end up in the traditional media.

Their YouTube Channel became the second most watched channel in the whole of Egypt following their continual stream of new videos documenting human rights abuses by the security forces.

This sparked a decentralised movement called Kazeboon. Meaning 'liars' in Arabic, in the last few weeks, it has seen groups spontaneously erect screens in streets and on squares and play these clips, all over Egypt. Kazeboon has become so popular it spread internationally; people are organizing screenings in New York, Paris and London.

The protesters face a lot of criticism that they are marginalised, divided and leaderless. Omar disagrees, adding the movement's strength is because "it's always been led, not by a person but by very basic, very simple precepts... Freedom, Liberty, Social Justice."

"We never had the 'majority' nor, and I say this with some ambivalence, have we needed them," he continues, "one per cent of Cairo would give you 200,000 people in Tahrir. If even 5% of Egyptians come down on the 25th of January the SCAF would realise their clock is ticking."

The anniversary is looming on the horizon and everyone is gearing up for it. Despite frustratingly slow change, when you look back to pre-revolution Egypt the people are bolder. If you look at the 18 days, you see maturity, especially on Tahrir. The last year seems to have been a process of self-education about what it means to go through a period of social change.

"What is crucial for me is my sense of time has shifted - no one really knows whether you will inherit what you are fighting for or whether you're fighting for a future generation. Everything is uncertain," explains Khalid, "But we all know the 25th of January is coming. That is really the New Year."

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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.