No. 10's Potemkin summit on internet porn solved nothing

Did it really take a choreographed Downing Street tea party to get an extra £1m for the Internet Watch Foundation?

The "Downing Street summit" is a trusty device to bump some minor item a couple of points up the news agenda. The Prime Minister doesn'’t even need to be present, as indeed he wasn'’t when Maria Miller gathered corporate internet Titans in No. 10 to declare collective horror at child pornography. 
 
It turns out the simple fact of the conversation taking place within those hallowed walls is sufficient to spur action. But what action? The assembled bigwigs - including representatives from internet service providers (ISPs), phone companies, search engines and social networking sites - pledged to boost the funds and powers available to the Internet Watch Foundation, the industry's self-regulatory body, to track down and block child porn. Agreeing to do a tiny bit more is unmistakably better than agreeing to do less. So well done Big Internet for disapproving of vile criminality! 
 
Did it really take a choreographed Downing Street tea party to get an extra £1m for the IWF (spread over four years)? And will that sum, multiples of which are routinely misplaced in the margins of Google'’s UK tax returns, do anything much at all to protect children from predatory paedophiles? The answer, each time, is surely “no”. But it has helped boost Maria Miller’'s profile at a time when the Prime Minister is known to be mulling a ministerial reshuffle. There is no doubt Miller is feeling embattled. Comments she made ahead of the summit, noting her own status as the only mother in the cabinet, have been interpreted –not exactly favourably as an attempt to secure her position. She has even had to defend  the very existence of her department from the whispered suggestion it might usefully be scrapped altogether. (When Steve Hilton was still firing off wild strategy ideas in No10 he notoriously wondered aloud if the DCMS might be downsized to a roomful of people and a website.) Miller’'s friends suspect a concerted briefing campaign to get rid of her, with a steady flow of unhelpful items turning up in newspapers and political columns. 
 
It doesn’'t take a tremendous leap of the imagination to suppose that a beleaguered minister might see some presentational advantage in striding purposefully along Downing St. as the scourge of child pornography.  Yet there is something a little dismal about the whole spectacle. Much reporting of the summit conflated two separate issues: access to illegal images of children –and children’s' access to entirely legal sexual images. It is pretty easy to get outraged about the former and to demand a crackdown; the latter appears not to have been addressed at all. What many campaigners really want  – and what ISPs resist– is a tougher regime of default filtering that means, in theory, children can’'t accidentally find themselves looking at the bad bits of the web. (Whether or not this is a good idea in theory or can even be done in practice is more complicated than it sounds– I wrote about it at some length earlier this year.) 
 
The volume and nature of readily available and entirely legal sexual images online –-  increasingly user-generated  -  is a source of massive anxiety to many parents. It is also complex issue in terms of carving out jurisdiction and apportioning responsibility for policing. It merges with the wider debate, no less tricky, about the social consequences of a more generally sexualised culture. Education is likely to play as important a part in the answer as filtering and blocking. Separately, every rational person can agree that illegal paedophile material needs to be expunged. The two problems are more distinct than is often implied in reporting. Meanwhile, neither came remotely close to being solved by yesterday'’s Potemkin summit. 
 
Culture Secretary Maria Miller leaves No. 10 Downing Street. 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.