Air samples in ten sealed glass tubes, collected by James Lovelock whilst studying chlorofluorocarbons (CFCs) in New Zealand and South Africa, c. 1985.
These glass tubes are a time capsule of our atmosphere. They were left over from a research trip scientist and inventor James Lovelock undertook to measure levels of a chlorofluorocarbon (CFC) gas that had been widely used in fire extinguishers. Armed with glass tubes and a flask of liquid nitrogen, he used a technique called cryogenic pumping to concentrate the air 100 times before sealing each tube with a blow torch.