No 3 Memorandum No. 3 continued
April 220 1776
It was a long Time before I could
discover even by Seeing the Works
how this could be effected, & the Man
who Shewed the Works could give
me no Satisfaction as to this) till at
lenghth I found that by Means of
a large Copper, (which is kept
boiling when it is requisite for
the Works to be Set in Motion) the
Steem or Vapour of the Water
is
conveyed from thence into a
C Strong Copper Tube of about 18 Inches
Diamiter & about 10 Feet
Long
the lower end of this Tube which
Stands perpendicularly, the lower
part or End of this Tube is tight, but the
uper part End hath
in it a moveable
Stopper which may move upwards
or Downwards at the low with as much
ease as possible and at the Same time
to keep any of the Air from without
from entering into the Tube