Who cares about Rebekah Brooks when we can talk about Andrew Marr?

The News International chief is accused of lying to parliament – but the press just cares about some

So we can finally talk about Andrew Marr. Hooray for us. What a victory for democracy and freedom of speech that we can write without fear about someone having sex with someone else. High-fives all round.

Meanwhile, Rebekah Brooks, the chief executive of News International, has been accused of lying to parliament. It's a story that slipped under the radar while the hyenas descended on the corpse of Andrew Marr's superinjunction, but it happened all the same: the MP Chris Bryant used parliamentary privilege to accuse Brooks of misleading the House.

He said: "Rebekah Brooks, who on March 11 2003 said she had paid police officers for information, wrote to the select committee a couple of weeks ago to say what she really meant was that other newspapers had done so. That is a blatant lie. This House should no longer put up with being lied to."

That is all very well for Bryant to say. But how can he expect anyone to be interested in such a story? Accusing a hugely powerful chief executive of a multimillion-pound corporation of lying to parliament is one thing; but did they lie to their spouse? If not, how can anyone even be bothered to fire up a laptop to write about it?

We're not interested in tales of lies to parliament; we want to know about celebrities and what they do with their genitalia. If the papers simply came out with this truth and admitted it, then I don't think there would be a problem.

"Look," they could say. "You know and I know that we're not really holding the rich and powerful to account. You just want to know which people are having a bit on the side with someone else. So here it is, not in any public interest, but simply to satisfy your craving for titbits about famous people's infidelities, because it shines a little glow of prurient happiness in your otherwise worthless little lives."

But no. We have to go through the pantomime of pretending that the reason everyone is fighting these superinjunctions is in the brave battle for truth against those naughty folk who've been caught with their pants down and are using their children as a human shield to protect their public profiles.

Even if that were true, that's not why it's happening. It's happening because celebrity-shagging flogs papers and people like to read about it – more than they like to read about evidence given to select committees, for example.

The rich and powerful are trying to use their wealth to pay for gags, the newspapers bleat. If only we could tell you about sex in hotel rooms, they whine. If only we could reveal details about who did what with whom and when, they grumble, then we could really hold these people to account.

Meanwhile, the rich, and really powerful, like Rebekah Brooks, just carry on, without fear of scrutiny from a large section of the press.

Patrolling the murkier waters of the mainstream media
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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.