1000000030

43 (

D:\')

ret one foot

in~,

as a centre, anJ with the o.

ther root defcribe the quadrant.1 arc

l'hen, with·

out ahering the compalfcs, fet one foot in

as :\ centre,

and with the other root dcfcribe the qu,drant

dD.

AIl

the other quadr,nl! in the figll re mllll be

J~fcribeJ

in the

lame manner, .nd lVith the fame opening of the compaf.

fes, on their centres , ,[;

~ ;

.nd

o: and e.leh

quadrant Jivided into fix equal part!, for fo many hours,

as in the figure; each or whieh pms mul! he

fuhdivid~d

iota 4, for the halr bours and quaners.

At equal diflances from eadl corner, draw the right

lines

Ip andKp, Lq

and

Mq, Nr. and Or, PlanJ

.tI;

to form the four angul.u hollows 1

K, L

NrO,

and

PI.t;

making the dillanees hetween the

tips or .there hollows, as

L M,

NO,

and

P.t,

mh equal to the radius of the quadrants ; and leaving

fu/licient room within theangular points

and

for

the e'luinoélial dial in the middle.

Todivide the iofides of ulefe angles prorerl)', for the

hour.fpaces thereon; take the follolVing method.

Set one foot of theeompalfos in the point

as a ceno

tre, and open th: mher tO

and with that opening

dereribe the are

Ihen,

witho~t

:\ltering the eom·

palh,

f~t

one foot in

and wilb the other foot de.

ferihe Ihe are

11.

Divide each of thefe ares, from

an~

to their i"terfeélion at /, into four equal part!;

and from their centres

and

through the pointsof di·

, ifion, draw the rightlines

' 3,

14' 1S, 16, 17;

and

2 .

Il ,

1/ ;

aod they lIIill m<tt Ihefides

and

of Ihe a"cle

where Ihe hou rs Ihereon mu(l be

plaeed

And thefe hour.fpaees iD the ares muf! be fub·

divided ioto lour eq ual pans , for the half·hours and

quarters.- Do the I,ke for the olher Ihree angles, and

draIV the dotted lines, and fet the hou rs in the infides

where thof. lines mw them, as in the figure: and the

like hOllr·lines IYill be parallel tO eaeh other in all the

quadrants and in all th. angles.

Mark poir,ts for all thefe hou" on the upper fide;

aod cut OUt all the anglllar bollolYs, and the quadrantal

oncs quite through the places where their four gnomons

~uO

lIand ; and lay down the hours'on their infides. as

'o Plate LXXI!. ano then fet in Iheir gnolllons, IIIhieh

muO be as broad as the dial i9 thick ; and this breadth

and thiekne(s mu(l be large enough

keep th. fi,adows

of the gnomons rrom evor

1~lhnr.

quite out at the fid(s 01'

lbe hollows, even when the /'uo's declination is at the

greatéO

Lallly, draw the equino,qial dial in ,he midJle, all

lhe hours of whieh areequidillant from eaeh other : and

lhe di,l lVill be fi niO,Cll.

As the fun goes round, the hroad eod of Ihe fhadow

of the Oi/e

aebJ

will Ole

the hours in the quadr,nt

Ar,

fromfun·rife till VI in the morning; the fhadow

from ,he end

will Ihew the hour, on the fiJe

!ro m VIO IXInthe morning; lhe Oladow of Ihe fiile

~!Ih

the qu.dranl])X(in the the long days) IYilllhnw the

hours rrom fun.rife till VI in the

mornir,~ :

: ..d (he Iha·

dOIll "r

th~ en~

IYdl OICW th: murninJ huur!, on the

fide

Or,

from

111

to VII.

JuOas Ihe lI",dulY I)f the nonhern Oile

a.~r¡/

gne, olf

the qu,d¡allt

,.Ie,

tI,e ihaJow of Ihe fuutl,(rn /lde

iUm

hcgins to fall \\'ithin Ihequadrant

FI,

VI indie

11101 ,' ·

ing;

~nd

fhelYs the time, in tI"'t qua.!rant, fromVl lill

Xli

at noon ; and from noon till VI in the el'cning in

(he quadrant

tn,~.

Aod the fi,aduw nf the end

fhe'ol's

the time rromXI in the forenoun till

JII

in theafternoon.

on the fide

,N;

as lhe IhadolY or the end

fhellls the

time from IX in the morning tilll o'doek in the after–

ooon, on the lide

At noon, wheo the fhado\V of the canern flile

'fgh

gnes

off the quadrant

(in IYhiehit Ibewed the time rrom \'1

in the moming till nuon, as it did in the quadrant

fromfuo rife 1111 VI in the mOlning) the fhadow of the

"'enero (lile

napq

begins tO enter the Su drant

Hp;

aod

fhews the hou" thereon frolD XII at

n~on

till VI in the

eveoing ; aod after

Ih~1

till fun fet, in thequadrant

q(;:

andthe end .teaOs a Oladow on thefide

Irom Vin the

eveniog lilll Xat nigh., If Ihe fun beoot fet befare that

time.

The fhadow01' the end

.¡

lbe\Vs the I1me

the fide

K/,

from

111

till VII in the ,fterlloon; and the OudolY al'

theOile

abcd

fhews the time from VI in the eveoing till

the(uo fm.

The Ibadow of the upright central wire, that lUppCrlS

the globe at top, fhew! the time of the day. in t!'c

middle or eqlli(,oétial dial. ,11 the /'ummer half

yw,

when the fuo is on the north fide of the equator.

DIALECT, an appellation given to the language of a

provinee, in fo far as it differs from that of the ..ho!e

kingdolll . The term, however, is more parrielllarly

ufed in fpeaking of Ihe aneiem Greek, whmof there

IV<re four dialeéls, (heAttie, lonie, Jf:olie, and Dv–

ric, <at h of IVllIeh

w~s ~

perleél I.ngu'ge in itl kind,

that 100k.plaee in eemin eountli.s, .nd h,d peculiar

beauties.

DlALOG ISM, in rhelOrie, is ufed for the foliloquy of

perfon! deliberatiog with thrmfelves. Set SOL

LO'

Q..U

DIALOGUE, in mmm of literator•• a

eonverfatio~

betwecn tWOor more perCons, eithcr by writillgw hy

IVord or Olouth .

Dialo~ue

appears to be thé mon aneient form of

IYritine•.

~od

is greatly reeommellded by

fe~ral

all'

thols. The

archb,f~op

01' Cambray, at the head

(,f

his paOoral inOruélion, givcs

aeCOunt

óf

the advan–

tages of dialogue.

DI ALTHAo:A, In pharmaey, an unguent mueh ul,d"

a re(olvcnt. fa caUed fl'qm alth:ea, or marfh·mallu",s,

whieh is (he p,·ineip.1ingrcdient in it. See ,h'IH

oll A.

DI.1LYSIS. ingl ." lInar, a m"k or eharoa.r, eonlilling

of t<Yo points, ", plaeed over tIVO\'o\Vels of a IVor.!,

in arder to (eparate them, beeaufe

oth~rwife

they

would makc a cllphthong, as

~Iofa'ie,

Ce.

Sec

01 .•:–

DI.1M (iTER. in

geo",etI'~,

a right line pa:1ing

throll~h

Ihe e, nto, of

eirele, and tClIl1inated at ea,'h liJe

\'y

the l'Írellmrerenec Ihereor. See GrOMEl

~ v .

DHMOND,

in natllr.,1 hifl"ry, a gen

liS

1"'eci~IlS

flunes, of a finc pe/lucid

lol.ll.

,"':e,

L,f

~re.1t

h.lr

,lodi •.

nCI'a I'oulco Ioy Ally ao·"iXlllre uf

Cdl

(hy ur ;In)' olh...

cO:llf<

OIa¡W,

r.I; 'l'tiblcof

ci,~.lllt

t¡:lb,·s

1',001

m,'tJI.

¡'n~