Credit: © The Royal Society
Image number: RS.9811
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Experimental equipment to test electrical conductivity in a vacuum
Date
1785
Creator
William Morgan (1750 - 1833, British) , Actuary
Object type
Archive reference number
Material
Dimensions
height (painting): 235mm
width (painting): 186mm
width (painting): 186mm
Subject
Content object
Description
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.
Inscribed in pencil above and verso with publication details. Not signed.
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.
Inscribed in pencil above and verso with publication details. Not signed.
Associated place