The Living Thing / Notebooks : Pattern formation

Cheap handsoap

Diffusion limited aggregation in cheap industrial hand soap

Reaction diffusion equations, and diffusion limited aggregation and other models for pretty blobs and swirls.

How the leopard got its spots.

To mention:

Patterns produced by electrical discharges on surfaces revealed by dusting with powdered red lead and sulphur. Sometimes termed 'Lichtenberg figures'. These experiments were conducted at Cragside in Northumberland, England, using a Wimshurst machine (electrostatic generator) and two 10-gallon Leiden jars. Current was conveyed to two rod conductors with a spark gap at which coated wires discs or plates were positioned. Lord Armstrong exhibited figures of the type produced at the Royal Society soiree at Burlington House in London on 16 June 1897. Plate 2 from Supplement to Lord Armstong's work on electric movement in air and William George Armstrong and Henry Stroud (London, Smith Elder & Co., 1899). The plate is inscribed below: "Plate II. POSITIVE INDUCTION DISCHARGE BETWEEN SMALL (POSITIVE) AND LARGE (NEGATIVE) DISCS." William George Armstrong, Baron Armstrong (1810-1900) armaments manufacturer and industrialist was elected a Fellow of the Royal Society in 1846


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