Brewster's Universally Attractable Powder - Pyroelectric Tourmaline Dust

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Right to left, Michael Faraday, Thomas Henry Huxley,

Charles Wheatstone, David Brewster, John Tyndall

From the 1924 Edinburgh Journal of Science, by David Brewster

And here's the whole article, from which the above was extracted. Of particular interest is the demonstration with tourmaline slices, on the fourth page

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Unrelated to this post, below is an example of

eclectic science esoterica 

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WARNING - Many subjects outlined within this site are extremely dangerous and are provided here for information only. Please don`t experiment with high voltages or chemicals unless you are fully conversant with safe laboratory practices. No liability will be accepted for death, injury or damage arising from experimentation using any information or materials supplied.