Tag Archives: light

Shedding light on the matter of rubbish

In the latest of our blog series linked to The Rubbish Collection, the Science Museum’s Inventor in Residence Mark Champkins finds an ingenious use for our discarded materials.

The second phase of The Rubbish Collection exhibition is open at the Museum until 14 September. Having documented every piece of waste that passed through the Museum for a month, this second phase is a chance to see what would have been thrown away.

Of the material that hasn’t been selected for display, I collected a small box of bits that I hoped to turn into a product that we might sell in the shop. I like the idea that with a little bit of effort and imagination, items that would otherwise be chucked, can be turned into something desirable. Unfortunately the collection of items in the box that I had gathered didn’t look at all desirable. A couple of umbrellas, some bits from a light fitting, an old copper funnel, an ash tray, some plastic cutlery, some glass cups and a selection of ball bearings didn’t look very promising.

A box of bits © Mark Champkins

A box of bits © Mark Champkins

The germ of my idea came from digging out the copper funnel and investigating it further. It was heavily corroded and covered in green verdigris, but underneath was structurally solid, and a beautiful shape.

I read somewhere that vinegar could be used to clean copper, so I popped down to the café, to get a couple of sachets to try out. It turns out it does a reasonable job on lightly tarnished areas, but can’t handle the extent of corrosion on the funnel. However, it did encourage me that the funnel could be saved.

An old copper funnel © Mark Champkins

An old copper funnel © Mark Champkins

Next I pulled apart the umbrellas, lined up everything from the box and had a think what I might make. A happy coincidence was that the handle from the umbrella fitted exactly into the top of the funnel.

 

An umbrella handle © Mark Champkins

An umbrella handle © Mark Champkins

My first thought was to make some sort of loudspeaker people could shout through. Next, I thought the umbrella handle might plug the funnel to make a water-tight vase or container of some sort. Finally, looking at the shining clean patch of copper I thought, coupled with a 1950s-style squirrel cage bulb, it might make a really nice light fitting.

The next step was to recondition the copper funnel. In the basement, the Museum has metal and wood workshops responsible for building, installing and maintaining the structures for new exhibitions. Amongst their equipment is a sandblasting machine, which I used to blast the corrosion from the funnel.

Sandblasting the copper funnel © Mark Champkins

Sandblasting the copper funnel © Mark Champkins

I decided to leave the matt finish left from the sand blasting on the inside surface, and polish up the outside. Using Brasso and eventually a buffing wheel I polished up the outer surface.

Polishing © Mark Champkins

Polishing © Mark Champkins

Using a buffing wheel © Mark Champkins

Using a buffing wheel © Mark Champkins

To ensure the lamp remains pristine, I decided to use a polymer based lacquer, applied in the workshop’s spray booth.

In the spray booth © Mark Champkins

Finally I added the umbrella handle, and a lighting flex and fitting. I think the finished light looks rather good. It’ll be available for purchase in the Museum shop from mid August.

The finished light © Mark Champkins

The finished light © Mark Champkins

The lamp made from Museum rubbish © Mark Champkins

The lamp made from Museum rubbish © Mark Champkins

The finished lamp at work © Mark Champkins

The finished lamp at work © Mark Champkins

The light will be on sale in the Museum shop in mid-August © Mark Champkins

The light will be on sale in the Museum shop in mid-August © Mark Champkins

Phase 2 of Joshua Sofaer’s The Rubbish Collection runs at the Science Museum until 14 September 2014.

A hundred years of the quantum atom

Alice Lighton, content developer for our Collider exhibition, writes about the history of quantum physics. Colider: step inside the world’s greatest experiment opens in November 2013 with a behind-the-scenes look at the famous CERN particle physics laboratory. 

A few years ago, a friend asked a question that took me somewhat by surprise. “Alice,” he said, “is quantum physics right, or is it just a theory?”

At the time I was in the midst of a physics degree, so my initial response was “I hope so!” Quantum physics matches up to experiment extraordinarily well – it is often called the most accurate theory ever. But the question, and subsequent conversation, made me realise how little many people know about the subject, despite its profound impact on modern life and the way we think about the universe.

This year is the centenary of the publication of one of the theories that laid the foundation for our understanding of matter in terms of quanta – packets of energy. According to quantum mechanics, light is not a wave, but lump of energy called photons. Max Planck came up with the idea at the end of the 19th Century, though he considered his light ‘quanta’ a useful model, rather than reality.

Niels Bohr

Niels Bohr, one of the founders of modern physics.

One hundred years ago, in 1913, the young Danish researcher Niels Bohr sent a paper to the Philosophical Magazine in London that used these quanta to solve a serious problem with theories about the atom. At the time, scientists thought the atom was like a solar systems; electrons orbit a nucleus of protons and neutrons. But anything that moves in a circle gradually slowly radiates energy, and so moves closer to the centre of orbit. Eventually, electrons should fall into the nucleus of the atom.

But they blatantly don’t, otherwise everything in the Universe would collapse, and we wouldn’t exist. Bohr proposed that electrons could only sit in discrete orbits or distances from the nucleus – and therefore when electrons change orbit transitions between orbits emit only emit energy in discrete packets (quanta), not gradually. The electrons therefore stay put in their orbits, and don’t fall into the nucleus of the atom.

A hydrogen atom is made from one electron orbiting a proton. Photo credit: flickr/Ludie Cochrane

Bohr was the first to show that packets of energy could successfully explain and predict the behaviour of atoms, the stuff that makes up you and me. His results were only approximately correct, but a big improvement of previous theories.

Generations of scientists have built on Bohr’s insight to understand and create the modern world. When my friend asked whether quantum physics worked, I pointed at his laptop. Computers, nanotechnology, and the Large Hadron Collider owe their existence to the physics that began with Bohr’s generation.

The CMS experiment at the Large Hadron Collider tries to work out the rules governing the sub-atomic world. Photo credit: CERN

Bohr’s original papers are clear and comprehensible, a beautiful read for physicists. The mathematics involves nothing more difficult than multiplication and division, yet the philosophical implications are immense. Max Planck never fully accepted quantum physics; neither did Albert Einstein, despite winning a Nobel Prize for his work on the subject.

Bohr also won a Nobel Prize for his quantum theory, but his work did not stop. He founded the Niels Bohr Institute, a centre of theoretical physics in Copenhagen, worked on the Manhattan Project developing the atomic bomb, and continued to make contributions to quantum mechanics.

And he has a lovely link to the exhibition I’m currently working on, about the Large Hadron Collider. Bohr was influential in the founding of CERN, the Geneva laboratory that is home to the LHC. If he had his way, the LHC would be in Denmark, but other scientists objected – Northern Europe was too cloudy, and had too few ski resorts, for Italian tastes.