MircROGRAPHIA., 
. This is very manifeft by the fealed Thermometers, which Ihave, by feve= — : 
- ral tryals, at laft brought to a great certainty and tendernefs : for Ihave 
made fome with {tems above four foot long, inwhichthe expanding Li- 
quor would fo far vary,asto be very neer the very top in the heat of Sum- 
mer, and prety neer the bottom at the coldeft time of the Winter. The 
Stems I ufe for them are very thick,{traight,and even Pipes of Glafs,with 
a very {mall perforation, and both the head and body! havemade on 
purpofe at the Glafs-houfe, of the fame metal whereof the dice are @ 
drawn: thefe I caneafily in the flame ofa Lamp, urged with the blaft of 
a pair of Bellows, feal and clofe together, fo asto remain very firm, clofe 
and even; by thistneans I joynon the body firft,and then fill bothit and 
a part of the ftem, proportionate to the length of the ftem and the 
warmth of the feafon I fill it in,with the beft rectified Spirit of Wine high- 
ly ting’d with the lovely colour of Cocheneel, which Ideepen the more 
by pouring fome drops of common Spirit of Urine, which muftnot be — 
too well rectified , becaufe it will be apt to make the Liquor tocurdle _ 
and ftick in the {mall perforation of the ftem. This LiquorI have upon 
tryal found the moft tender of any {pirituous Liquor,and thofe are much _ 
more fenfibly affected with the variations of heat and cold then othermore 
flegmatick and ponderous Liquors, and as capable of receiving a deep 
tincture, and keeping it,as any Liquor whatfoever; and ( which makes — 
it yet more acceptable ) is not fubject to be frozen by any cold yet — 
known. When I have thus filled it,I'can very eafily in the foremention- _ 
ed flame of a Lanip feal and joyn on the head of it. 4 gyi aa 
Then, for graduating the ftem, I fix that for the beginning of my di- — 
vifion where the furface of the liquor in the ftem remains when the — 
ballis placed in common diftilled water, that isfo cold that it juft begins 
to freeze and fhoot into flakes; and that mark I fix at aconvenient place 
of the ftem, to make it capable of exhibiting very many degrees ofcold, _ 
below that which is requifite to freeze water: the reft of my divifions, 
both above and below this (which I mark with a[o]} ornought) Fplace 
according to the Degrees of Expanfion, or Contrattion of the Liquor in A 
proportion to the bulk it had when it indur’d the newly mention’d freez- 
ing cold. And this may be very eafily and accurately enough done by _ 
this following way 3, Prepare a Cylindrical veflel of very thin plate Brais 
or Silver, ABC D of thefigure Z; the Diameter AB of whofe cavity — 
Jet be about two inches, and the depth B C the fame; let eachend be — 
cover'd with a flat and {mooth plate of the fame fubftance, clofely foderd 
on, and in the midft of the upper cover make a pretty large hole EF, 
about the bignefs of a fifth part of the Diameter of the other; into this 
faften very well with cement a ftraight and even Cylindrical pipe of Gla, 
EF GH, the Diameter of whofe cavity let be exactly one tenth of the a 
Diameter of the greater Cylinder. _ Let this pipe be mark’d at GH with — 
a Diamant, fo that G from E may be diftant juft two inches, or thefame — 
height with that of the cavity of the greater Cylinder, then dividethe 
lengthE G exactly into 10 parts, {0 the capacity of thehollowofeach 
of thefe divifions will be ;3;; part of the capacity of the greater rie a 
= ch. 4 
