C 2I 5 ] 
The operation and progrefs of the lightning in the 
obelifk and upper parts of the heeple deferve more par- 
ticular attention. T o form a more perfect idea of thefe 
the following meafures will in fome degree contribute, 
Feet 
The height of the odiogonal 
obelifk - - - - — _ - _ - 22- 
Length of the iron fpindle — ig - 
Thicknefs of the fpindle, where 
inferted into the hone. - - - * o- 
Jts length inferted into the hone g - 
From the bottom of the fpindle 
to the fir ft cramped joints. - - 5 - 
Three courfes of hones without 
cramps. - -- -- -- -- - ^ _ 
From the bottom of the fpindle 
to the firh concealed chain. - - n - 
From the firh concealed chain one 
foot above the bafe of the obe- 
1 if^k to the firh crofs chain. - - 2 - 
From the firh crofs chain to the 
fecond, placed in the dome - 8 - 
Inches, 
“ 3 
- 9 
- 2 fquare 
- 10 
- 10 
“ 7 
- 5 
- o 
- 10 
The vane, the crofs above it, the ball and its focket, 
whicn covered lo much of the fpindle as arofe above 
the hone, to near ten feet of its length, were of cop- 
per gilt. This length of the fpindle was cylindrical, 
but the other part was made fquare, where it began 
to be inlerted into the hone. To lahen this fpindle 
moi efecurely in the courfes of hone, melted lead had 
been poured. Tins lead, in the two lower courfes of 
hone through which the fpindle had pah'ed, not only 
hiicd ail the ipace left between the fpindle and the 
hones. 
