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Micrograp Hl A.
one of these ssuid bodies,then tOthe other,will appear from this 5 thatthS
same ssuids will by being put into differing , change theirfitrfaoes,
For the lame water , which in a Glass Or wooden Vessel will haVe a con-
cave surface upwards,and will rise higher in a sffialler then a greatch Pipe,
the same water, I say, in the same Pipes greafed over or oyled. will ps de-
duce quite contrary efsects 5 for it will have a protuberant aridr^ex fiis-
sace upwards, and will not rife so high in small, as in bigger Pipe’s Y Nay,
in the very same solid Vessel, you may make the very same two contigu-
ous Liquids to alter their Surfaces 5 sor taking a sinall Wine-glass,or sueh
like Vessel, and pouring water gently into it, you shall perceive thefur-
sace of the water all the way concave^ till it rife even with the top. when
you shall find it (if you gently and carefully pour in more ) to grew
very protuberant and convex 5 thereasonof which is plain, for that the
folid tides of the containing body are no longer extended , to which the
water does more readily adhere then the air 5 but it is henceforth to be
included with air, which would reduce it into a hemisphere^, but by reason
of its gravity it is flatted into an OvaL Quicksilver alsb which to Glafs
is more incongruous then Air ( and thereby being put into a Glafs-pipe^
will not adhere to it, but by the more congruous air will be forced to have
a very protuberant surface, and to rife higher in a greater thena lesser
Pipe 5 this Quicksilver to clean especially GsGoldySilverfin.Lead^
See. Iron excepted,is more congruous then Air and will not only flick to
it,but have a concave Surface like water3 arid rife higher in a less, then iri d
greater Pipe.
In all thefe Examples it is evident, that there is an extraordinary and
adventitious sorce, by which the globular Figure of the contained hetero^
geneous ssuid is altered 5 neither can it be imagined, how it should other-
wise be of any other Figure then Globular : For being by the heterogene-
ous ssuid equally protruded every way ,whatsbever part is protuberant^ will
be thereby deprejl. From thiscauseit is, that in its eflests it does very
much reserable a round Spring (huchasa Hoop.) For as in* a round Spring
there is required an additional preflure against two opposite lides, to re-
duce it into an Oval Form, or to force it in between the sides of a Hole?
whose Diameter is lest then that os the Spring., there must be a considesa-5
ble force orprotrufon against the concave or inner side of the Spring 5 So
to alter tMts sphericalconssituticn of an included ssuid body , there is re-
quired more pressure against opposite sides to reduce it into ah1 Ovaf arid,
to press it into an Hole less in Diameter then it felf, it requires a great er pro-
trusion against all the other sides. What degrees of force are requisite
to reduce them into longer and longer Ovals, or to press fherri into lest
and less holesy I have not yet experimentally calculated 5 but thus much
by experiment I find in general, that there is alwayes required a greater
pressure to clofe them into longer Ovals, or protude them into stnaller
holes. The necessity and reaibn of this, were it requisite,I could easily ex-
plain : but being- not so necessary, and requiring more room and time
then I have for it at present, I shall here omit it 5 arid proceed to shew,
that this may be prefently found true , if Experiirient1 be made with a
E 2 round