323
That he had obserued that hor
se Dung would send a volatile salt
quite through a wall of fowrteen inches thick which
would shoot and grow on the other side into a kind of
niter.
m
r Hooke ^ /shewd/ his experiment being a
contrivance from hygro
scope /made/
by the help of ^ /seuerall short/ Gutt strings or any other shrinking
body sen
sible of the moysture & Dryne
sse of the air.
the
se were vnited together by the meanes of Irons wires made after
the manner of
scales beames that the shrinking ^ /& swelling/ of euery one of
them was communicated to to the La
st which moued the Index. by
which meanes the Lea
st mutations of the air as to Dryne
sse
& moy
sture were made very sensible, and the contriuance of
it was soe ordered the Lea
st Degree of power it had to stretch
or shrink the string, would easily moue & make a sen
sible alter
ation. Some objected that Gutt strings would in proce
sse of
time Loo
se the power of shrinking & stretching and soe were
vnfit for such a work. But It was answered that tho
se strings
were not intended for a Con
stant
weather clock /hygroscope/ But only
for
. . . the present v
se to shew the manner how he make v
se
of the
se or any other shrinking & swelling body for the shewing
of the effect De
sired; And that the next meeting
. . .there would be one of an other substance produced that
would not be Lyable to tho
se objections.
Ref: CELL/RS/HF_325 © Centre for Editing Lives and Letters
