The UK hasn't grown at the same rate as the US

The Treasury's spin is at odds with the facts.

Today's GDP numbers of 0.5 per cent were the best Britain has seen for a year but nowhere near enough to meet the Office for Budget Responsibility's optimistic prediction for 2011 growth of 1.7 per cent. The Treasury tried to put a positive spin on the release by claiming that it puts the UK on a par with the US but the truth is a little more complicated.

Shortly after the figures were released, ITV Business Editor Laura Kuenssberg tweeted, "Treasury sources say UK grown at same rate as US so far in 2011".

For this to be true, it would mean that the Treasury are conveniently ignoring the effects of last winter's snow which chopped 0.5 per cent off GDP. As the Office for National Statistics' own statement says:

The interpretation of the estimate for Q3 is complicated by the special events in Q2 (for example, the additional bank holiday in April for the royal wedding), which are likely to have depressed activity in that quarter. As with 2010 Q4 and 2011 Q1 (affected by the bad weather in Q4) it may be wise to look at 2011 Q2 and 2011 Q3 together, rather than separately. On that basis GDP has grown by 0.6 per cent in the last two quarters and by 0.5 per cent in the last year.

US figures out last week showed that the annualised rate for the third quarter was 2.5 per cent. Comparing like with like, this means that the US economy grew by 1.6 per cent over the last year. The chart below shows that the UK has lagged the US economy at every point in the last two years looking at growth on a year-on-year basis.

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Today's numbers mean that UK growth in 2011 is unlikely to be higher than 1.0 per cent. In their first estimate in June 2010, the OBR predicted that growth would be 2.6 per cent before revising it down twice to 2.3 per cent after the Emergency Budget and to 1.7 per cent this March. They are now almost certain to do the same again on November 29th when the Chancellor delivers his autumn statement. Instead of trying to put a positive spin on these figures, the Treasury should focus on getting the economy moving again by adopting a Plan B that slows the pace of cuts and puts in place a programme for jobs and growth.

Will Straw is Associate Director at IPPR

Will Straw is Associate Director at IPPR.

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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.