Experimental equipment to test electrical conductivity in a vacuum William Morgan
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Experimental equipment to test electrical conductivity in a vacuum
Plate 9 figures 1-2 from the paper "Electrical experiments made in order to ascertain the non-conducting power of a perfect vacuum", by William Morgan, Philosophical Transactions of the Royal Society, vol.75 (1785), pp.272-278. Figure 1 shows a 15-inch mercury gauge partially coated with tin foil, emptied of air and inverted into a mercury cistern. A wire is visible within this reservoir, through which an electrical current was passed but without light or discharge in the vacuum gauge. Figure 2 shows a method of making mercurial gauges by Mr Brook of Norwich. I
Original: ink and watercolour on paper. 1785
- Image reference: RS-9811
- The Royal Society
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