Dismantled capacitor. This is a device designed to store and release electric charge. The charge is stored in a rolled up cylinder of material seen at centre (brown). The external sleeves (plastic and metal) are at upper left. The lids of the cylinder (centre left and upper centre) contain the leads that connect to a circuit. The rolled up material consists of electrolytic capacitor paper (brown), a layer of aluminium oxide, an electrolytic liquid (the paper is wet), and aluminium foil. The charge is stored on the foil, while the paper, oxide and liquid are the dielectric. For this capacitor in its working state, see image T355/244.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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