The bar was set high, and Ed Miliband has cleared it

"An audition before the country for the post of Prime Minister."

The Labour leader took a risk today. There was a technical risk: he spoke without notes, which can go wrong in many ways. And the speech was long, which exponentially increases the danger of stumbling and losing the audience. But that is a small practical obstacle compared to the tactical gamble that his speech represented, which was – in effect – advertising itself as an audition before the country for the post of Prime Minister.

He didn’t set it out in quite those terms, but throughout the week his team has been allowing the idea to float around that this would be a defining piece of oration. The Miliband camp took the highly hazardous step of acknowledging that there had been flaws in the way their candidate presented himself and admitting that voters are under-whelmed by the Labour leader – or downright dismissive. So expectations were ramped up, which is the opposite of what usually happens. (The standard line at these conferences is “it’s only a speech, why is everyone so excited, of course it’s not a make or break moment.” Etc.)

So the Miliband operation set the bar high. Luckily for them, the Labour leader appears to have cleared it. He seemed much more confident than he has done on similar occasions in the past; much more in control of the mood in the room and much more assertive in delivering his message. He got a few good laughs in the right places. His theme - “One Nation” - was a pretty audacious raid on Tory language and, as a fusion of traditional left appeals to solidarity and a patriotic idiom more commonly associated with the right, it clearly has potential as a platform to reach out to a wide section of the electorate. His aides are busy now describing it as a radical vision. (That, of course, is something they always do.)

The obvious criticism was that Miliband is still travelling very light on policy and still skirts over the question of tricky spending pledges. It wasn’t exactly a macho demonstration of tough choices and a trampling of party shibboleths. (That really isn’t Miliband’s style.) He is wide open to the charge of policy flimsiness. No doubt the defence will come out that David Cameron was no more heavily freighted with practical policy at an equivalent point in his time in opposition. The mid-term challenge is to attract voters attention and sustain their interest in a way that makes them think they might be looking at their next Prime Minister. That was the explicit task that Ed Miliband set himself this week. Did he pass the audition? Too early to tell. But I suspect the party will come away more confident that they can talk about Prime Minister Miliband and the Conservatives will be a little bit less complacent in their assumption that no one is listening.

Labour Party leader Ed Miliband acknowledges the applause after delivering his keynote on October 02, 2012 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.