Romney's final stumbling block?

Latest polling shows a dirty fight in South Carolina may be all that's holding him back from Obama.

Having squeezed through Iowa by 8 votes and won convincingly in New Hampshire, the road ahead looks pretty clear for the former Massachusetts Governor. He has campaigned pretty much ever since 2007, and now it seems as though Mitt Romney has finally seen off all of his challengers and is focussing his sights on the presidency.

One by one, Republican candidates ranging from former Speaker Gingrich, through Herman Cain the CEO of a pizza chain, Congresswoman Bachmann and Texas Governor Perry to former senator Santorum have each had their own surge (and decline) in the polls as Republicans tried to find someone that is not Mitt Romney. The problem with Romney -- or so think many Republicans -- is that he is not seen to be conservative enough for them. He's a moderate. And so they courted Bachmann, Cain, Gingrich, Paul and Santorum. All the while, Romney's ratings remained fairly constant. That was another criticism: despite having the most money and arguably the most name recognition, Romney was not "energising the base" and there was no groundswell of support for him. It was said he was Mr 25 per cent.

Our Ipsos poll for Reuters of Republicans, released on the day of the New Hampshire primary, had Gov Romney on 30 per cent -- his highest since we began tracking in June 2011. The poll also shows that he has the best chance of defeating Obama in November. In a match up of Romney v Obama, the Republican is just 5 points behind the President. Ron Paul is the next closest but trails Obama by 7 points.

So what does Romney have to do now to seal the nomination? The answer is simple, and the same as it has been for a while: Don't mess up. The fabled "big mo" (momentum) is clearly with him, as is the money which is vital if the race drags on. South Carolina -- the next Primary -- poses a threat in a few ways. First, voters there are more conservative than in New Hampshire and this is a demographic in which Romney suffers. However, South Carolina tends to be more "establishment" in its taste, preferring well-known and established politicians unlike "outsiders", as preferred by Iowa.

Second, campaigns have a history of turning dirty in South Carolina and you can be pretty confident that Gingrich, Santorum and Paul campaigns are preparing attacks to bring down Romney in South Carolina. They'll attack him for "being liberal", flip-flopping on abortion, the similarities of his Massachusetts healthcare plan to that of Obama's controversial reform, and the current popular attack is to highlight his time at Bain where they say his job was to fire people; with high unemployment a big issue in the US that does not look good. It is unlikely, however, that these attacks will do enough to stop his move to becoming the nominee. Losing South Carolina may not even be too damaging to his campaign -- especially as he is financially and organisationally the best equipped for a long race of attrition.

Rick Perry will need to do very well in order to stay in the running. Having almost dropped out after placing fifth in Iowa and focussing his attention on South Carolina -- a state in which the more conservative Texan should feel more comfortable -- his fortunes lay heavily in the results of the next primary. Speaker Gingrich too will need to think long and hard about his chances if he misses out on the top spots. Ron Paul and Rick Santorum are more likely to stay in and make this race last that bit longer before we can call Mitt Romney the Republican Presidential candidate for the 2012 race to the White House.

Tom Mludzinski is Deputy Head of Political Research at Ipsos MORI

Tom Mludzinski (@tom_ComRes) is head of political polling at ComRes

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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.