Cameron's referendum gun is firing blanks

The Prime Minister cannot negotiate effectively in Brussels and give his MPs what they want at the same time

David Cameron’s position on whether there should be a referendum on Britain’s membership of the European Union is an entirely rational one. That isn’t to say he is doing the right things at European summits or has the right policy. It is simply an observation about the tricky position he is in, having to negotiate simultaneously in Brussels with fellow heads of government and in Westminster with his own party.

The two sets of demands are incompatible. In Brussels, the Prime Minister wants to influence the evolution of European institutions as they adapt to the single currency crisis. He needs to preserve British influence without signing up to any more political or economic integration. That balancing act gets harder when his continental counterparts think the UK is determined to sabotage their efforts and is, in any case, striding towards the exit. That is precisely the message that would be transmitted by a premature commitment to a referendum regardless of what comes out of current negotiations.

Tory Eurosceptics, meanwhile, argue that the prospect of a referendum will focus the minds of the PM and the rest of the EU, making it clear that the final deal has to be a good one for Britain ...or else. That view rests on the uncertain premise that other European countries desperately want to avoid a British exit. Diplomatic patience with the UK is running thin. Besides, seasoned observers of the Tory right (at home and abroad) recognise that the end game for many MPs is exit no matter what concessions are wrung from Brussels. Why should Angela Merkel or François Hollande offer David Cameron favours on the basis that it might help him control his party and buy a renewed mandate of the UK’s EU membership when they know perfectly well that it won’t?

But Cameron can’t simply tell his party to shut up and wait and see what he has negotiated before demanding a referendum. Tory MPs don’t trust his pledges on Europe and want some indication that the plebiscite they crave will materialise. So he has to indicate that he recognises the need for a vote without actually stating that there will definitely be one. Britain’s membership of the EU really ought to be ratified by a national vote but there isn’t much point asking the question until the terms of that membership are settled and they are now, thanks to uncertainty over the single currency, in flux. That is Cameron’s position and, as I say, it is reasonable given the political constraints he is under.

The most aggressively eurosceptic section of the Tory party, however, is minded to be unreasonable. I don’t mean that in the pejorative sense of ‘irrational’. I mean their patience has run out and they don’t want excuses. They feel Cameron has been given the benefit of the doubt on Europe in the past and has been flaky on the subject. (In fact he has been extraordinarily accommodating.) His promises to deliver something – maybe - at an unspecified point in the future are worthless currency in the Conservative ranks.

There is no great diplomatic advantage in sounding off about a referendum; if anything it weakens Britain’s negotiating position. Nor does the vague promise of a referndum do very much for non-aligned voters with other things on their minds. So the only point of even talking about a vote is as a gesture to the Ukip-leaning tendency and the only gesture that will satisfy them – a clear irreversible commitment to an in/out question - is one the Prime Minister cannot make. It is, in political terms, as if Cameron has pulled out a gun to look all macho eurosceptic when everyone knows he is firing blanks.

David Cameron "can’t simply tell his party to shut up and wait and see". Photograph: Getty Images.

Rafael Behr is political columnist at the Guardian and former political editor of the New Statesman

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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.