110
on the other. It was Deliuerd to m
r. Hunt to be put into the Repository and
thanks were orderd to be return'd to the Doner
S
r. I Hosking propounded that the next Day for the better
ag augmenting the light that
wax tapers might be v
sed. And S
r. Chr: Wren added that the light of a
Lamp might be augmented on the object by making v
se of a deep conuex
gla
sse for
col collecting the rayes of a candle &c on
the Object
m
r. Haak Presented from m
r. Barnard at Oxford a small book
to the .. . .written by way of a Letter from mo
r. La
stellett one of the french academy w
chmeet at mo
r. Bardelots. at Paris ^/to the said mo
r. Bardelot/ in w
ch. the said mo
r. La
stellet Indeauours to
shew that mo
r. De
scartes hypothesis & Doctrine for Soluing the Motions of
the Seas & tides by the motion of the moon was fals and contrary to the obserua
tions & joynt aggreement of all Astronomers. But R H Declared that
hauing perv
sed the book he found that the said mon
r. La
stellet had proceed
ded vpon a fraud mi
stake of
the said mor. Lastellet his own of the said De
scartes hy
pothesis, occa
sioned as He
said RH coniectured from his viewing the figure or scheme
of De
scartes w
thout peru
sing or well con
sidering his words, for that
as if he had
been ma
ster of De
scartes hypothesis before he went about to confute it he might haue
saued him
self the Labour & would thereby haue neither Le
ssened his own iudgment
or called in que
stion that of De
scartes. Thanks was orderd to be returnd to m
r.
Barnard & the book to be putt into the
repositorylibrary
After this RH. shewd the Second Exp
t. w
ch. was the plug or sucker of the Airpump
made after a peculiar manner contriued
About & made about two years since
by him for the perfecting of that Engine. the contriuance of w
ch was as follows
A Round plate of Bra
se was made to fa
sten to the end of the sucker this was turned
somew
t Le
sse than the hollow of
the cylinder but yet as neer of the bigne
sse as It could be w
th.
out touching, vpon this by the help of screws was fa
stned another plate ^/of the same bigne
sses/ and the screws
soe orderd as not to goe through the fir
st plate but only into it. between the
se
two plates was put a thin Round plate of cork which was cut of such a bigne
sse
as to goe into the hollow of the cylinder pretty stiff.
by means of this edge
of cork
as the which hauing a very Durable and very remarkable spring made
the pl
ate or Sucker Conform it
self soe perfectly to the cauity of the Barrell as
not to Leak in the Lea
st and by rea
son of the yealdingne
ss of that sub
stance
It was soe easily moued vp and Downe that there seemd to be nothing
more De
sirable for the perfecting that engine; and that the air might haue
a free vent out of the said Barrell. through the plugg there was made a small
/hole/
value through the fir
st plate w
thin the 2
d Ring, and it was Well secured by a
value w
ch. opend out wards & shut inward The De
scription of w
ch. will
be plainer vnder
stood by the annexed Delineation -
And notthe.. ...Leaue Roome to insert the figure
half a Leafe side will suffice _
[In margin]no: 15
Ref: CELL/RS/HF_112 © Centre for Editing Lives and Letters
