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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0203
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etris Opinion he chintes prest wich many lcarce an. Retraction in the Hleavens, buc have rheir Marro
tverabie Vissicolcies; lor Airst, che Tails ol Co- supplied trom che Head.
mers never appear adorned wich various Colours,
For as in oue Air che Smoak ot any kindled
pohich ver are ulually che inleparable Concomi. Body alcends upriehe it che Body be AE rest, BuF
canes ot Retraction. Rgain, che Lixlic oF chetix d obliquely il ic have a Lareral Morion any nay
Stars and Planers comine eo us direetlr, and rrans.(o in thefleavens, Where Bodies graricare rolvards
micced distinctls, plainly Meps, chac etie Celesti- ehe Sun, Stnonk and Vapours ouxhe ro alcend ux
al prediums ic pallech etiroueh have no retractins trom chie Sun, and thar in a Righe Lne, it chic
Porer. And as torhe Rachacion and Twinkline smoakcine Body be ac rest: or obliquely, it it move
oF the sxed Scars, rhac ouphe ro be accribured ra-
any ray lacer aII), and by irs propressive Morion
her ro a Retraction in our Eyes, or eo be occasi doch alivars delere rhole Spaces trom wvtence rhe
oned by che Premmious Morion ot che Air; be- luperior Parrs ot che Vapours had alcended: And
canse wtien e look on ehem chrouch a Telescope, ehis Obliquicy will be lels ntiere the ACcen OF chc
ehere is no such FhInZ. The Fremor of chie dir, Vapours is more Cwitr, viz. neaethe Sun, and near
and ot che alcendins or descendine Vaxours may thelmonkine Bcdy. From che diversicy ot chis O.
ex Ely occalion a lirrle quiek luccessire distorrion ot bliquiry rhe Column of che alcendine Vapour rill
he Rars trom lo (nall a poine as che Puxilot ones be incurrared; and becaule the lapour in che
Eyc; bur chey cannor do l0 tromthe much larger precedene lide dt che Column, is somethins never
Apercure ot a Telescopes Object. Class, Which is or more recene chan ihe orher, ic vilt cheretore
ehe Reason Why chere is an apparene rintlins in be a liesle more dense, and contequently more
ehe tormer bue nor in che lacrer Cale; and che copiousy reffect che Lishe, and be delined or ter-
Cellarion ot ihe scintillarie in the larcer, is 2
Demonttrarion chac chere is a Regular Transmil
tion oF che Ra)et Lighe wichour any sensible RC-
minared more distinctly chan etie ortier sde.
Thac chere may arile trom che Armosphere ot
Comets Vapours enouph ro cate up such immense
Spaces, may be inderstood seom ihe Raricy oF
OuE AIT: For Air near ihe surtace ot our Farrti
ehe Retraction ot ie suns lxac mms caroueh takes up a Space 850 rimes as large as Wacer ot
them Covards us, and dccou de Figure oF etie lame eishe wich ic; and cheretore a Columr
he Hleavens, ere deffected ro Parrs oppolire ro ot Air of 850 Foor hiph weiehs no more than one
ehe Sun, char Defection in the lame Regions oF of Wacer ot but onc Foorhistr, it cher have boctu
ehe Eleavens must alvvars be made cowards che chelame Balc. Bur a Column oF Air oF chetieiphe
Tame Pares; buc ehis, by plain and undoubred ob.
ofche wtiole Armosphere, Weiphs no more rhan a
Column oF Water oF abour 23 Fcer high, and ot
che lame Base; and cheretore if from chis whole
Colurin oF Rir you substract the lorver part aS FaK
trom che Nucleus or Flead, and alcend rowards as che heiphr of 850 Foor, che remainine C olumn
ill veiph equal co a Column oF WVater OF 22
che Laws Which chey oblerre; as, thal  i Foor: trom whence (by rhac Lyporhelis which is
the Planes oF the Orbus ot Comets Wrhieh pals no contrmed by many Experimenes, ic may. be
chroveh che Sun, chey deriare trom M polici- fairly concluded, charche Compression os the sir is as
on oF che sun alvars cowards chole Palto, Wnich ehe meiehe of che incumbent armosphere, and itat
etreir Fleads, as ther move formard, leare e Gravity is reciprocally as the Square of the distanee
Orbits: That, 10 2 Spectaror placed M cucle os Places from the Centre of the Farth.) Ifound
Planes, elicy appear in parts directs me  by calcularion, Cairh he, (ihe pround ot whictr he
the Sun; buc chac it che spectator deviae d uulle gives in Prop. 22. Cib. 2.) Thac Air, ac che di-
stance trom our Farchs Surtace, et only one demi-
sible, and every Day appear Grearer and Grearer. Diamerer ot the Parrh, is more rare chan ic is wirti
us in a Racio mueh exccedins chac wtich al che
Space beloir ehe Orb oF sarun bears co che Di2-
met, as allo wwhen the Fead ot InC C d meter of a Globe oF only one Inch in lenerh
And cheretore a Globe oF our Air ot only one Inctu
et ehe Deriarion Be observed near che Flead. ot che in Diamerer, it ic had bue che lame deprec et Ra-
comet; belides chac chole Lails wrhich do nor de- ricy irhich oue Air hach ac the distance ot 4000
riace, appear srair, bur chose thac do, appear cur. Miles, or oF che ParchS SemiDiamerer From us
vould more than sII all che Regions or cho Planets.
Deviarion is greater, and more lensible where che as Far as the Sphere ot Saturn and much tarther.
Lail is of che preacer lenoch; For in shorr ones ir Wheretore lince Air, as vou eo hiptier, will sil
es hrardlr oblerrable. Thac che anple of Deriari.) Prow iimensely rare, and ehac the Coma oe At
en is lels near the Flead OEthe Comet, and Breater mosphere of a Comet counced trom irs C’enrre is a-
neac che opposice exeream, and cheretore ac The bour ro rimes hixtier chan rhe superticies oF che
Tait FUEHS IES ConreZ Parrs corards the Place Nucleus, the Fail of ir ascending per much hixtien
must needs be exceedinsly rate.
And chouxh, because ot ehie great Crassrude ot
etie Remolphere ot Coiners, ind rtie preac Gravira-
And thac chole Fails wrhich are larger and longer, tion of Bodies rorards the sun, and etie Gravira
tion ot the Parricles of Rir and V’apour connarde
one anoctier; it may be chai che Rir in chese Cele
Rial Spaces, and in the Tails OF Comets may nor
be rarihed quire lo much, vet ris plain by chis
Compurarion, chac a very litrle quanriry of Air
traction.
Castly, IE che Tails ot Comets ivere produced by
terration, hach been tound eo be talse in fact, and
cheretore ehis Accoune cannor De che true one.
Thac che Pails or Bcards oF Comets do arile
ehe Resions oppolic. le n sun, l commured by
trem chele Planes, their Deviarion will become len-
Llac, che Veriaciom, an nx Comacte lolels
ntiele che l’ait is obligie l0 n ou ot the C0-
proaches nearer ro che sun, especially it che Angle
veco Lhat che. Lueracule IS FCCaces Where l
stdut trich the Veriacion is made, and wtrich
AC Is d Kighe Linc draun Erom che Sun chroust
rise Flead ot che Comet, and produced intinicelz.
and vohich Mine briphcelt, are more. lplendid to:
Wards eheir Conrex sides, and ate ollet dehried,
Concare Sides.
Wheretore che Phaenomena oF che laus  Cons
devend uxon the Mlorion of. their Feads, and noc and Vapours will sussice ro lolve aIl che Phaenomena
uxon that lcerion os ihe eavens in Wneh ene LiCa fot che Tails ot Comeis.
oe more distinctl lentaca chere, chan on their
ie leen, and iheretore de b) lo means arite trom