The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 191
The machine was then worked, the positive electricity passing into the tur-meric paper at the point p, and out at the extremity n. After forty or fiftyturns of the machine (a plate fifty inches in diameter), the extremity n wasexamined, and the two points or angles found deeply coloured by the… … extremity brought opposite to a point p, connected with the conductor of themachine. After working the machine for a short time, acid was developedat both corners towards the point, that is, at both corners receiving the elec-tricity from the air. Then a long piece of turmeric jiaper, large at one…
Architecture · Civil engineering · Science
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