C 332 ] 
they had never before feen eleCtrical experiments in 
perfection, 
I am, 
S I R, 
with great regard and efteem, 
your mod obedient 
humble fervant,. 
Wm. Hamilton, 
Explanation of Plate XIII. 
A. Sedion of the third room. B. Section of the 
eighth room. C. Section of the ninth room. D. Bands 
by which the lightning defcended vertically. E. The 
gilding affeCted moft in the corners and marbled with 
black, where the lightning was moft powerful. F. 
Bell- wire melted. G. Jump of the lightning traced 
on the white wall. H. Vertical defcents of the light- 
ning marked on the white walls; the greateftjump, 
from the iirft picture frame to the fecond, is 1 3 inches. 
I. Hole made in the wall by the lightning. K. Piece 
of wood beat out of its place and burnt. L. Sopha, 
the gilding blackened. 
Receiued , 
