Experimental equipment to test electrical conductivity in a vacuum mb-code 584DA SACELLI REGALIS SURDECANUS

SACELLI REGALIS SURDECANUS

with figures and cart in foreground

Framed as if on individual sheets of paper and signed below 'A

including ciliates

one standing on a heavy carved wooden table

Experimental equipment to test electrical conductivity in a vacuum mb-code 584DA SACELLI REGALIS SURDECANUSPlate 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