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===1905 lecture on electron arrangements===
In a lecture delivered to the [[Royal Institution of Great Britain]] in 1905,<ref>{{citation |url=http://www.ub.edu/hcub/hfq/sites/default/files/Thomson_model%286%29.pdf |first=J. J. |last=Thomson |date=10 March 1905 |title=The Structure of the Atom}}. Reprinted in {{harvnb|Davis|Falconer|1997}}</ref> Thomson explained that it was too computationally difficult for him to calculate the movements of large numbers of electrons in the positive sphere, so he proposed a practical experiment. This involved magnetised pins pushed into cork discs and set afloat in a basin of water. The pins were oriented such that they repelled each other. Above the centre of the basin was suspended an electromagnet that attracted the pins. The equilibrium arrangement the pins took informed Thomson on what arrangements the electrons in an atom might take, although the insight was limited as the experiment functioned in two dimensions instead of three.
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