Experimental equipment to test electrical conductivity in a vacuum mb-height 4477 'Beeston Castle in Cheshire'

'Beeston Castle in Cheshire'

and the duty of the Liberal Party

North front of Princess's Theatre on Eastcastle Street

A bed and door mat seller

Experimental equipment to test electrical conductivity in a vacuum mb-height 4477 'Beeston Castle in Cheshire'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