[April 20, 1776, cont.] & to
keep it as tight as possible
another part of the Works constantly
Supply the Top of the Tube above
the Stopper with a Small Stream of
Water-- The Steem of the Hot Water
(as I take it) entering into the Tube
rarifyeth the Body of the Air contained
therein to that degree a great degree
when the Stopper is let loose and flyeth
upwards with great Rapidity when to
the upper Part End of the Tube when the
Pressure of the Air [throweth back?]
[well?] from without throweth back to
the Bottom of the Tube with as great
Force as it came upwards, when it
gets to the Bottom it is again drove
upwards by the Same cause, & repelled
when it arrives at the Top: thus the
Stopper is kept in const constant
Motion by the Means of Steam or
Vapour, & to this Stopper
is fastened
a Stout Wooden lever by a bar of Iron,
the Lever is Fastened in the Middle
upon an Axis and as the Stopper of
the Tube moves upwards and downw=
-ards it moves the Lever, which fits
worketh the Engine in the Well