[ i66 ] 
complcat to the lower end of the pipes, that dlfcharge 
the water from the circular part of the great cupola, 
upon the floor of the ftone gallery. 
From the bottoms of thele pipes, which terminate 
with a Ihoe of lead within half a foot of the floor of 
the flone gallery, the metallic communication is again 
interrupted to the top of the leaden pipes, which con- 
vey the water from thence. Here it is propofed, that 
condudfors of lead, not lei's than four inches in breadth 
and half an inch in thicknefs, fhould be placed fo as 
to be in contadt with the bottom of four of the pipes 
that come from above, and with the top of four of 
thofe that defcend. Lead is recommended to be em- 
ployed here, as more readily adapting itfelf to the va- 
rious curvatures it mufl meet with in the now pro- 
pofed arrangement, 
Thefe laft pipes, after defeending below the colon- 
nade, near the circular flair-cafes, make their appear- 
ance upon the outlide of the drum-part of the cupola ; 
where they are bent at obtufe angles, and difeharge 
their water upon the roof of the church; From thefe 
angles to the roof the diflance is about five feet. Here 
then is another interruption to the metallic commu- 
nication. This is propofed to be compleated by con- 
dudtors of lead, fimilar to thofe before mentioned, 
which fhould be fo placed as to be in contact 
both with the bottom of the pipes and the adjoining 
roof. 
From the roof, as has already been mentioned, the 
leaden pipes are continued below the furface of the 
earth, and terminate in a drain j and thus, by the 
method now direded, the metallic communication 
will be compleated from the crofs on the top of 
c St. Paul’s 
