Mali: now for the hard part

As David Cameron visits Algeria, it seems that Downing Street is only now realising just how long-term a project defeating the Islamist rebels in North Africa will be.

David Cameron’s visit to Algeria is the first since that country won its independence from France 51 years ago. No former British leader thought it worth the time or effort. The decision comes after the penny finally dropped in Downing Street: forget Afghanistan or Pakistan; the threat from al-Qaeda is on Europe’s doorstep.
 
The area of operation for al-Qaeda in the Islamic Maghreb (AQIM) and its affiliates, offshoots and allies stretches from Mauritania to Chad. Some reports suggest that Nigerian militants of Boko Haram received training in Somalia, which would mean that the al-Qaeda arc can be traced from the Atlantic to the Red Sea.
 
The French intervention in Mali is just the latest instalment in this much wider conflict. With hardly a shot fired, and to the cheers of local people, French paratroops retook the ancient desert city of Timbuktu. “Operation Serval”, as the French term their offensive, has gone at least as well as anyone in Paris could have wished.

The only setback came when allegations emerged that Malian soldiers had butchered ethnic Tuaregs and Arabs. The International Federation of Human Rights Leagues said at least 31 people were executed in the central town of Sevare, and their bodies dumped in wells.

International concern has focused on the priceless manuscripts dating back to the thirteenth century, stored at the Ahmed Baba institute. It now appears as if suggestions that all 30,000 manuscripts were lost may have been exaggerated, since many were smuggled away for safekeeping.

The question now is how the French-led operation will proceed. Paris has been keen to replace its 2,900 troops with an African army, and pledges of support from West Africa have been coming in. Some 1,750 African troops have already arrived – from Togo, Niger, Nigeria, Burkina Faso, Benin and Senegal. Almost 8,000 African troops are expected, although the deployment has been slow.

France is keen to involve its international partners. Britain, at first, insisted that it would only help with the logistics. Now up to 350 troops are being despatched, ostensibly just to assist with the badly-needed retraining of the Malian army.

The real beneficiary of the Malian crisis looks like the United States. The African Union, led by South Africa, had strenuously resisted attempts by the US Africa Command (Africom) to establish a base on the continent’s soil. It is now reported that the Pentagon will get its way, after signing an agreement with Mali’s neighbour, Niger, that clears the way for an increased American military presence. The agreement is designed "to counter shared threats in the region," a US defence official told the Wall Street Journal.

The New York Times reports that this will allow drones – vital for the surveillance of the vast deserts of Mali – to be flown from Niger. This programme is still in the planning stage, but it would not be the first such operation in Africa. Africom already has a base on the Red Sea in Djibouti – Camp Lemonnier. The United States is said to fly drones from a re-furbished airfield in Ethiopia, as part of its war against the Islamist fighters of al-Shabab in Somalia. Gradually, the US is establishing a military presence on the African continent.

Rebuilding the Malian army will be no easy task. The United States has attempted to train the Malian army for years. American support for Mali’s military was part of a counter-terrorism programme costing more than $500m to train and equip armies across the Sahara to combat militants. “Operation Flintlock” brought troops across the Sahara to be given specialists training.

Less than two years ago Mali’s Assistant Chief of Defence, Colonel Béguélé Sioro, described this training as an “exemplary partnership” offering an “opportunity to evolve alongside seasoned troops, accumulate experience in the fight against criminal organisations and increase our operational effectiveness.”

Yet when the Islamist fighters launch an offensive, pushing out the Malian army from the central town of Konna on 10 January, the Malian armed forces all but collapsed. Mali's interim president Dioncounda Traore had no choice but to turn to Paris for help.

George Joffe, North African specialist at Cambridge University, says the weakness of the Malian army was exacerbated after American aid was cut, following the Malian coup of March 2012. He believes the rebellion will to a tough nut to crack.

Europe’s head of counter-terrorism, Gilles de Kerchove, told the French News Agency, AFP, that intelligence reports indicated that the Islamists have around 3,000 fighters. American sources, speaking to the New Statesman off the record, suggested that the Islamists began melting away into the community as the French advanced. Some villagers were forced to leave their homes as fighters moved in to pass themselves off as local people.

In the longer run, says Joffe, the rebels may retreat to their desert fastness of Taoudenni. These salt-mines are on the ancient trade routes that ran from Morocco to the Gold Coast, or present-day Ghana. “They are riddled with deep mines and passages,” he says. “For a decade the Islamists were there, undisturbed, and they could retreat to this sanctuary if forced out of central Mali.”

Crushing the Islamist rebels is likely to be a long-term project. Their fighters have yet to be defeated and African forces nowhere near ready to take over from the French. The mostly likely outcome of the conflict is that Paris will have to carry the burden for years to come. France launched Operation Epervier to save Chadian president Hissene Habre in February 1986. They are still there today.

Malian soldiers arrest a man suspected of being an Islamist in Timbuktu. Photograph: Getty Images

Martin Plaut is a fellow at the Institute of Commonwealth Studies, University of London. With Paul Holden, he is the author of Who Rules South Africa?

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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.