( ><S8 ) 
. 
in it may the better keep together, and the two Ends 
of itdand Perpendicular to the Tube in allPoftures: 
Nor ffiould it be much lefs, lead the hanging of the 
Spirit to the Sides hinder it from fettling fo truly by 
its Weight to the lowed Part of the Tube. This 
Tube is cemented into another Brafs oneCDEF, 
of the fame Curvature,' the outer Half of which is 
taken ' off, fo as to (hew the Glafs, leaving only a 
fmall Part in the Middle D F entire, in which a 
fmall Stop-cock G is placed. The Glafs Tube is di- 
vided in two in the Middle to make room for this 
Stop-cock, the Key of which muff be pierced through 
with a Hole of only about one hundredth Part 
of an Inch, for the Paffage of the Liquor. The 
outer Ends of the Glafs Tube mud have a Commu- 
nication with one another round about by Means 
of two fmall Pipes I and K, and the Tube H, 
the manner of which is diffidently (hewn by the Fi- 
gure. 
Each half of the Glafs Tube A B mud have a 
Scale of Degrees anfwering the Curvature of the 
Tube, fubdivided atPleafure. They may be num- 
ber’d either as the upper or under Scale in the Fi- 
gure ; and obferve that in the under Scale two De- 
grees are number'd as one ; the Reafon of which is, 
that the Motion of the Spirit in the Tube encreafing 
the Number on one Hand, and at the fame time as 
much diminiffiing that on the other, their Difference 
is alter’d thereby, fo as to anfwer to double that 
Motion. The Divifion of the Scales are cut on the 
Edge of the Brafs half Tube, or Trough, which is 
made thick for the greater Strength. 
t 
In 
