Is Kosher still kosher?

When it comes to animal welfare, should secular standards trump religious scruples?

The lower house of the Dutch parliament has voted by a large majority to ban the slaughter of animals without prior electric stunning, as practised by religiously observant Jews and Muslims. The Netherlands would not be the first European country to have such a law -- it is already banned in Sweden, Norway and Switzerland -- but the vote has inevitably reopened the debate on the balance that any modern society must strike between common standards and the rights of minorities to maintain their own traditions.

The debate is perhaps especially fierce in Holland, a country that has long been at the forefront of liberal modernity but which has more recently seen deep and ugly divisions on questions of immigration and culture. Last week saw the acquittal of Geert Wilders on charges of inciting religious hatred through his strongly expressed condemnation of Islam. The vote on banning ritual slaughter has been compared by the country's Chief Rabbi to Nazi legislation that began with the closing of kosher abbatoirs and ended with the Holocaust.

The comparison seems exaggerated, even offensive. But then Hitler was famously a vegetarian. Concern for animal welfare has not always gone hand-in-hand with love of human beings or the promotion of human rights. Even if -- as I strongly believe -- increasing concern about the treatment of other animals is a mark of a more civilised society, it doesn't necessarily follow that those promoting new rules act from disinterested motives.

For many people, the question is purely and simply one of reducing -- so far as is possible -- the pain and suffering of the animals being killed for food. The best scientific evidence suggests that pre-stunning animals is more humane than the religiously-decreed alternative of slitting their throats while still conscious, and that should be the end of the matter. It is widely accepted, after all, that even in a tolerant and religiously plural society some practices are off limits. There's no prospect of allowing female genital mutilation, for example, or child marriage, or the ritual use of illegal drugs. There's even a growing debate about the morality of cicumcising baby boys.

By and large, religious leaders accept that exemptions cannot be demanded as of right, or purely on the grounds of tradition and strongly held belief, but that they must pay lip-service at least to secularism. It's not enough to say simply, "This is what God has ordained". If religious slaughter were demonstrably cruel -- not merely less humane, but mandated that animals be slowly tortured to death or roasted while still alive -- then the argument would have ended long ago. In fact, before the introduction of prior stunning there was little or any distinction, in terms of animal suffering, between religious and non-religious slaughter.

The question thus is whether the religious should be forced to take on board the modern advance of electric stunning if they are to continue to eat meat. The change may in fact be easier for Muslims than for Jews, since some interpretations of Islamic law allow animals to be stunned before being killed. The practice is widespread in New Zealand, where for largely commercial reasons almost all meat is now halal. But Jewish law has historically been flexible, and one should never underestimate the ingenuity of rabbis.

The aim of both kosher and halal butchers -- they claim -- has always been to dispatch the animal in as swift and merciful a manner as possible. God, they would argue, would not have ordained a needlessly cruel death for his creatures. And this is, of course, the stated purpose of modern, secular, animal welfare regulations. Of course, being modern and secular the regulations invoke science rather than God, but the motivation is similar. One might almost call it religious.

Instead of crying religious discrimination, should the rabbis and imams not rather be grateful to the scientists for helping them to fulfil the deeper purpose behind their commandments more faithfully?

Belief, disbelief and beyond belief
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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.