1000000030

E V

yUI:r tJbk for. redlh'lion, f":,.tr.I..1;,,c ekvell ill–

ches, whieh wi ll le"ve Ihe heiglll of AL tlVelve

f,~l

fi x

illclte!, and lhis nOle duwn i,l yJur l'ook. Now

lurn Ihe

I.vd

hori¡onlal!y abollt, fo Ihat Ihe

eye.~I,ís

of the tel&ope m<y be

IO"Jds

¡\,

an.! r:xir.g up a–

nOlher flaff at

e<ufe the mark G

be moved up

and down till you fpy fume eonfpieuous

pHI

litrougn

lhe telefeope or fights. Me<fure the height

HG,

whieh feppofe feven yarJs one fOOl

111'0

ioches. Mea–

fure likewife Ihe diflanee of Ihe points

lH,

whie!:

fuppofe one Ihoufand tim e hundred y" ds; for whieh

ddlanee four inches . ight lines mun be

fublraél~d

froO\

lhe heigh t HG, ",hieh eonfcqucolly will only leave

feven yards nine inehes four Iines,

be takendown in

your bonk. This done, remove the level forwards

tofome olher eminenee, as

whenee the flafF

may

be .ie\Vld ; as alfo

an~ther

flaff at D, nea\' the place

whi(her the waler is

be eor.veyed. Thelevel being

again adjufled in lhe point E, look back to the Oaff

H ; and managing the mark as before, the vifual ray

will give the point F, Meafure the he'ight HF, whieh

fuppofe eleven fee t fix inehes. Mealure I,kewife the

diflance HE, which fuppofe a lhoufand yards, for

whieh Ihere is

IWa

inehes nine Iines of abatement;

whieh beinc l&kenfrom lhe height HF, there \ViII re–

maio eleven feet lh ree inehes three lines';

wh~ch

enler

in your

~ook ,

Laflly, turning the level to look al the

next flaff

the vifua! ray IVill give the po:nl D.

Meafure the height of D from lheground, whieh fup–

pofe eighl feel lhree inehes. Meafurealfo thedi flance

from the !lation E tO

whioh fuppofe r.inc hundred

yards, for whieh diOan:e there are til'Oinehes three

lines of abalement ; wbieh being taken from the height

BD, therewill remaineight feet nine Iines ; which en–

ter as before.

For themannerofenleringdownobfervations ioyour

book, obrerve, that when a proper place or flation for

tht level belween the til'Opoinls has beeo pitehed up–

on , IVrite down lhe lWO heighlsobferved at that (Iation

in two difrerent columns,

viz.

under the firfl eolumn ,

thofe obferved in looking

thro~gh

lhe lelefcope when

Ihe eye was from the fpring, or towards lhe point,

whieh we may eall baek 6ghts ; and under the feeond

eolumn, thofe ol;lerved when the eye was next the

fpring, whieh lVe call forefights. Having fummed up

the heights of eaeh eolumn feparatcly, fubtraé! lhe

lefl'er from the greater, the rcmainder will be the dif·

ference of the level belwecn Ihe poinls A and

the difl.nee of lhe t\Vo points be required, add all the

diHanees me.fured tocethcr; and dividing the difFer–

enee of

h<!i~ht

the yards of the diflanees, for eaeh

I\VO hundred yards you \ViII have a defeent of about til'O

inehes nine lio(6.

Dr. Halley fu ggefls a new method of levellinc, per–

forOled wholly by

me.ns

of the barometer, in wlrieh

the meleury is found to be fufpended tO fo mueh

th~

lef, ntigltt, as the pbee is fauhe, remote from the

cenrer of the ean h; IVhenee the diffcrcnt heights of

tire mercUly in til'O plac.s

~ile

the di/ferrnce oi level .

T His metltlld has uceo IUt in pr aélicc by fome of lhe

l'reneh mdcmy.

LEn LL tNG

ST.IV

<S ,

inOruments ufed in

Itvelling,'f~r

ving tO e<l ry the marks to be obferved, and . t tlt"

f.me

lillle rl, me.tli"e tite heights of thofe marks from

th~

cround. 'L ey ufu,lIyeonfifl e.ehof tlloOloog wooden

rul<cs, máde

r.;d<!

OV"'

oneanother, and dlv,de

inl~

fm, ineh's,

ce.

LEVER, or LEA vER, in meehanies, See ME CHA-

cs.

ERET, among fponfmen, denotes a hareio the 6rll:

yea, of her age,

LEVIGAT ION, in pharmaeyand ehemiflry, the re–

ducing

h.rd

and ponderous bodies to an impalpable

pO'Ndtr, bygrinding th'em

a prophyry, or the like.

LI:.VITE, ina general fenfe, means all lhe defeendanl!

of Levi, among whoOl were the j ewi/h priefls them–

felves, who beingdefeended fromAaron,

~'el e

likewife

of ,he race of Levi: but it is more pauieularly ufcd

for an order of ollieHs in that ehureh, who were em–

ployed in performing the manual ferviee of the lemple,

fueh as in fetehing wood, water, and othe, things ne–

ee{[<lY for the faerifiees, and in finging aod playiog

upon inflruments

01'

mufie.

LEVrTICUS, a canonieal book of the Old Tellament,

fo ralled from its eontaining tbe laws and regulations

relátiog to the prieOs, Levites, and faetifiees ,

LEVrTY, iD phyfiology, the privatioD or wan! of

\Veight io any body, when compared with another

lhat is heavier man it, in whieh feDfe it flaods oppofed

togravity.

LEVY, in Jaw, figoifies to gather or c911eét, as to levy

money : and to Ic!vy a fine of lands, is the pafling a

fine.

LEWARDEN, a eity of lhe

nited Provinccs, lhe

capital of well Friellaod : E. long.

3S',

Iat.

n°

20' .

LEWES, a borough·towo of Sull'ex, rorly miles fouth

of London, whieh feods til'O meOlbers to parliament.

LEWIS , the mofl nonherly of any of the IVeOero ifiands

of Seodand, Iying in

8°

odd minutes W. long. and be–

tween

S9°

and

S9°

odd minutes N.

1<1.

LEXICON, the

I~me

as diélionary, bu, ehicOy ufed iD

fpcakingof Greek diélionaries, See D, CT

10NAR Y.

LEYDEN, a eity of Holland, io.whieh there is

fa–

mous univerfity, fitum d lweoty miles foutli of Amfler–

clam,

LEYTE, one of the Philippine iOands, feparated from

lhe ifland Philippina by a Darrow ehanne! : E. long.

123°,

lat.

1 ' •.

LlBANUS, a ranceof mountains in AfialieTurky, be–

l\'leen Syria and Palefli ne, IVhich cxtend fromSidoo

on the Levant, eafl ward beyoud Damafeus.

LIBA.TrON, a religious eercmony among ,he aoeient

pagaDs, which confilled inaneffufion of liquors poured

on lhe hcad of the viélims prerarcd fo r f:teri ficc.

LI BAW,

pon·tolVnof Poland, in ,he daehy of CO\t(–

land. fitllateo on a hay of lhe Bahie: E. long.

2 1

N. 1 .. 56·

40'.

LlBELLULA, in the hifiory of infeéls, agenus of fOll r–

Wir.glO ftics, eall.d in

En~lifh d,"~on. flie!,

or adder–

Oirs; the eharaélers of ",hil'h are thefe: The mouth

is furnifllld IVith jaws ; the

fce!~l s

arc /hortcJ lhanthe