Made in England for 50 years: the lava lamp celebrates its birthday
Invented in 1963, the lava lamp's fortunes have risen and fallen over the years
It's hard to believe that anything as jaw-droppingly futuristic could be 50 years old, but the lava lamp (or astro lamp as it was originally known) is celebrating that venerable milestone this month.
Invented by a British account named Edward Craven -Walker in 1963, the lava lamp quickly became an icon of 1960s psychedelia, with news of the product spread by worth-of-mouth.
The lamps work by using a light bulb to heat a bottle containing coloured oil and water (and some other minor chemicals – but those are the main two). The oil and water have similar densities but are insoluble to one another, meaning they don’t mix.
When the bottle is heated the oil absorbs the heat first, expanding in size as it does so. The expansion means that it becomes less dense and begins floating upwards. As it floats up it cools, contracts and falls back to the bottom of the bottle, starting the chain of events all over again.
This continual slow motion process is based around very slight differences in density between the oil and water – the balance between them is like a very sensitive pair of scales, with small amounts of heat tipping the balance back and forth.
The lamps are still made in Britain today (see below for a video of the process) though robot works now join humans in spinning and shaping the metal bases. Bizarrely, these assembly line robots have come from Detroit – with the machines sold cheaply to Mathmos (the company that makes the lamps) after the collapse of the American city’s motor industry.
Harry Potter actor suffered 'severe flu-like symptoms' on a flight from London to Orlando
First full-length look is finally here
World cities ranked in terms of safety, food security and 'liveability'
"Oink! Oink! Hee hee hee!" First interview with the big-screen star
Biohacking group hopes technology will lead people to think about even more dystopian uses
Life & Style blogs
Snapchat removed the Best Friends list feature and 'stalkers' are upset
Baldness could soon be treated using stem cells, scientists hope
A bottle of wine a day is not bad for you and abstaining is worse than drinking, scientist claims
Eight-year-old girl Camilla Lisant suggests possible cancer treatment to her scientist father over the dinner table
Lack of medically trained staff leaves NHS 111 phone service struggling to cope, insider claims
9 reasons Greece's experiment with the radical left is doomed to failure
'We would evict Queen from Buckingham Palace and allocate her council house,' say Greens
Have we reached 'peak food'? Shortages loom as global production rates slow
Greece elections: Syriza and EU on collision course after election win for left-wing party
British grandmother Lindsay Sandiford faces execution by firing squad in Indonesia
Liberal Democrat minister defends comments suggesting immigration causes pub closures
- 1 Saudi preacher who 'raped and tortured' his five -year-old daughter to death is released after paying 'blood money'
- 2 The awkward moment Sarah Palin raised $25,000 for Hillary Clinton's election campaign
- 3 Ball pool for adults opens in London
- 4 Amal Clooney gives excellent response to fashion question at European Court of Human Rights
- 5 Baldness could soon be treated using stem cells, scientists hope
iJobs Gadgets & Tech
£40000 - £60000 per annum: Recruitment Genius: This is a fantastic opportunity...
£25000 - £35000 per annum: Recruitment Genius: A skilled .NET developer with e...
£25000 - £30000 per annum: Recruitment Genius: This IT support company are cur...
£35000 - £43000 per annum + Benefits: Ashdown Group: Senior IT Support Analyst...