Experimental equipment to test electrical conductivity in a vacuum mb-code 584DA 'The Rod Still in Pickle'

'The Rod Still in Pickle'

with figures and cart in foreground

Lansdowne House in Berkeley Square

The barracks were built for the Horse Guards in 1795

Experimental equipment to test electrical conductivity in a vacuum mb-code 584DA 'The Rod Still in Pickle'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