New Statesman: announcing our new bloggers

Glosswitch, Martin Robbins, Bim Adewunmi, Ryan Gilbey and Kate Mossman join the "blogging powerhouse".

Five new bloggers today join the New Statesman team, writing about parenting, pop culture, film, music and science. Meet the newest additions to our "blogging powerhouse" (seriously, that's what we called it last time we had newbies). 

Glosswitch

A mother of two, and writer of the Glosswatch blog, she describes herself as a "humourless feminist in mummy blogger clothing". In her previous posts for the NS, she has dared to defend "yummy mummies" and told off Benedict Cumberbatch. She tweets @glosswitch

Go to her blog

Martin Robbins

Author of the Guardian website's Lay Scientist blog, Martin will be writing for the NS about skepticism (and scepticism), the media and sexuality. His posts might sometimes be NSFW, but will always be both entertaining and factual. He tweets @mjrobbins

Go to his blog

Bim Adewunmi

Bim blogs at Yoruba Girl Dancing and The Flick, and she will be writing a weekly column on pop culture and telly. She tweets @bimadew

Go to her blog 

Ryan Gilbey

The New Statesman magazine's film critic now has his own dedicated blog on the site (he's a StumbleUpon crowd favourite). Ryan blogs about films with authority, puns and love. 

Go to his blog

Kate Mossman

The New Statesman magazine's pop critic will be writing an extra weekly piece for the website on "pop" music (whatever that means these days). She recently wrote about the 30th anniversary of Michael Jackson's Thriller, which you can read here.

Go to her blog

Our five new writers join our existing blogging team:

David Allen Green on law Go to his blog

Laurie Penny on politics, pop culture and feminism Go to her blog

Mehdi Hasan on world affairs Go to his blog

The Vagenda on magazines and media Go to their blog

Nicky Woolf from America Go to his blog

Helen Lewis on games, satire and anything else, really Go to her blog

Nelson Jones on belief and religion Go to his blog

Steven Baxter on the media Go to his blog

Rowenna Davis on politics outside Westminster Go to her blog

Gavin Kelly on economics and evidence Go to his blog

Martha Gill on psychology and neuroscience Go to her blog

John Stoehr on US politics Go to his blog

Alex Hern on the internet (it's a series of tubes, apparently) Go to his blog

Michael Brooks on science and discovery Go to his blog

Samira Shackle from Pakistan Go to her blog

Alan White on social affairs and society Go to his blog

Juliet Jacques on culture and counter-culture Go to her blog

Alex Andreou on finance and Europe Go to his blog

Helen Lewis is deputy editor of the New Statesman. She has presented BBC Radio 4’s Week in Westminster and is a regular panellist on BBC1’s Sunday Politics.

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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.