376 / 1042
D
A
4; 0
D
A
Ihe pbte \ViII
Cm
the fuo direélly
~I
000000 Ihe equi. rouoIIhorizontal board, io whieh thm is
a
comp~fs
aod
ooéliAI days. Let the (un Olioe (re<ly lhrough the
hol~
m:lgnrtic needl,!, for plAcing tlle
IIltridiQlllhle
toward
il1to th<rotl",:antlh,n::a plu!1lh.lioe to the cicling oflhe the (olllh. 'rhe pillar
h~s
a joint IVith a
~uadl20t
upoo
1"001, at
bll
:ive or li x (cet from Ihe wtOdow, in fueh a it, di"ided iOlo 90 degrees((uppo(ed to be hid flOI11 fitltt
plaee allhat lite fuú r,IY', lr,nlmittedlhrough Ihehole, under Ihe dial io Ihe ligure) f(¡r felling it 10 Ihe I"ilune
may fallupon Ihe line ",heo il is nooo
h
':'c dock; aod o( aoy gil'eoplace; the (.me way as alreadydelcribed io
h,,'iog IllAlke<Í Ihe fatd pLlee 00 thc cieliog, take away thedial 00 the cro(s ,
Ihe lioe.
The equator of Ihe globe is dividcd iOlo 24 equal
Ilaving aJj"fle" a OiJiog
~ar
to a dove·tail groo.e, pans, and Ihe hours are laid tlown upoo it at the(e paru.
io a pieee of 1V00d about 18 ioches loog, aod fixed a The titile of Ihe daymay be koown by Ihe(e houlS, wheo
hookiOluthemiddle of thc har, lIail the womllO the ahoye· the (uo \hines upoo Ihe globe.
Oleotiooed pl..ce 00 Iheeieliog, pmlld 10 the fiJe of the
To reélify and ufe this dial.
(~t
it 00
~
level table, or
room io",hleh Ihe windolV is; the g,ouI'e aod bar being (ole of the window, whete the fuo \hioes, placiog the
to..mls the Ruor. Theo, hao; Ihe plumb. hoe upoo the Illeritliao Hile due fouth,
~y
means of the needle; whieh
hook io theblr, the weight or I'luml\1et reaehiog almon will be, IVhen the oeedle poiots as far from Ihe nonb
to the Iloor: and the whole will be prepmd fur fmher Reur de·lis tOIVard the well, as it dediots weflward, at
a~d
proper adjuilol<ol.
yonr place" Then beod Ihe
pill~r
io Ihe joint, lill Ihe
This dooe. fiod the true folar time by eilher of Ihe blaek lioe 00 the pillar comes to the lalitude of your place
tIVO lall
melhod~,
aod thmby regulate your dock. Theo, io Ihe
quadr~ol.
~I
Ihe momeot of oexl 0000 by Ihe dock, wheo the fno
The maehloe being thus reélifir.d, Ihe plaoe of ils di·
l1iioes,
mov~
the Oldiog·bar io the groove, uOlillhe \ha· al,pul wdl be parallel to the equ210r, tlle wire or axis
¿cw of Ihe plumb.lioe bi(eéls ¡he image of the fuo (m"de II"t (uppom the globewill be paralld tO Ihe w th's
ax·
by his raV! rraoGnined throngh the hole) 00 the 1I00r, is, aod Ihe oonh pole of the globe will poiot loward Ihe
wall,
cr
(¡O
a
while b eeo plaeed 00 the oonh (¡de of oonh poie of the heavens.
Ihe line ; Ihe plummet or weight
al
Ihe eod of the lioe
The fame hour ",illlheo
bt
\hewo in (ereral of the
haogiog treel)' in
a
p:nl of waler plaeed bclow it 00 lhe hollows, by the eods of Ihe \hadows of Ih..ir re(peélive
Roor,-Bul bCCdufe this may oot be qnite eom,q for Ihe Odes : the axis of the globe will call a fhadow00 Ihe
firll tIme. 00 aeeouol Ihallhe plummet will nOI fettle 1m· (ame hour of lhe day, in the
e~uiooélial
dial. io Ih.
nleaialdy. eveo io water; it may be f. rthereorrelled 00 centre of which it is plaeed, from Ihe 20lh of Mareh to
Ihe follulViog da)'!, by Ihe aoove melitod, wlth lhe fuo the 2jd of Seplcmber; alld, if the merid;an or your
and dock : aod io broughl toa very greal exaéloefs.
plm 00 the globe he fet eveo
~'ith
the Oleridiao lIile,
aJl
N li.
The rays trao(mtlted through Ihe hole, lVi
11
eafl Ihe pam of the globe Ihat the fun \hio' s uFoo, will ao·
hUI a t.iol image of 11" luo, eveo on
a
\Vhite fcreeo, uo- (IVer to thofe plaCés of Ihe real carth which are Ihenea–
lers the room be fo darkened Ihat ou(uo\hioe ñlay be al· lighleoed by Ihe(nn. The places where Ihe
1I1~de
isjnll
10IVed
10
elller, bnl \Vhal comes Ihrough Ihe (mall hole comiog upon Ihe glohe, aofwer to alllhofe places.,cf Ihe
in Ihe pi_te. Aod always, for (ome lime before Ihe ob· earth to which Ihe(110is theo (elIing; as Ihe places where
(erval,on is nude, Ihe plumrnet oughl 10 be Immer(ed io it is going off, aod Ihe light eoming 00, aolwer 10atl
a jar of waler,
~'hm
it may hang freely; by which thc places of Ihe eanh where the (uo is thenri(¡ng. And
IIIcan! Ihe line \VIII rooo become fleady, whieh otherwire lallly, if Ihe hour of
VI
be marked 00 the equalor in
\vould be apt to
c~oti¡)ut (lI'iogi~g,
Ihe meridiaoof your place (as it is maTked on Ihe
~eri-
dianof Loodoo in the figure) the divilion of Ihe Ilght
aod Olade 00Ihe globe wi'l nlew Ihe lime of Ihe
~Jy,
,111 utlivrrr. 1diJI. fh<":vi/lg
¡},
hourt
o[
I~~
da}
'"
n Irr·
"jI,i.1
gU"
and b)
1/'(
¡badvwl ;¡fov(,al
,~1I1IInl/l,
al lb, fall/( linl': I.grth" 'Wilh . /I Ih, plaw
.r
Ih(
,.rlh,vhichar,
lA",
mlighl<nrd
hJ
lA,
fUll;
alld Ihofo
",vhich
I/:(
JUII
iJ
Ih,n rijÍlIg,
" M
die
IImi",an, or
¡("ing.
This di.l ((ee PIAte
LXXI!.)
il made of a Ihick
('Iuare pieee of \Vood, or hollow OIelal. The lides
are
cut
into
(~Ill\, ireulu
holl l"s. io which the buur! are
pl_~d;
the ¡ble 01 each hollolV
eomio~
out frllm Ihe
Oon
Ih~rtof,
as far '" Ihe enJs ollhehollows projeél.
'Coe eorneTS are rut OUt
1010
ancles, 10 the InlidLS of
,,'hirh
Ih~
hourl are alfo
mal ~ed:
aod Ihe enge of Ihe
end of e:..h Ir,k 01' rhe
aogl~
lerv<s as a Ilik fu, edl\iog
a
Ih,Jow
(>11
the
1,~l\rs
111,11
~e,1
(10 tI,e utl,el fide o
lo Ihe
m',lrll~
(¡f Ihe uppcrm(llllidc, or pi Ine, Ihere is
ao
(~\lII,oé\t,1
Ji"I; in Tite
eeotr~
","e'tuf 3n
upri~ht
v
Ir(
l'
fm . lor eallir.g aOlldu'" un Ih" hours uf Ihat di·
?J,
aorl (u.nonios a rnulllewll,i,1
~I~,b:
00 ils lor.
'1
ce
Vll,ule
d"j
U.cd.03 a r,!lar, 10 th mldJle of
a
The oonhern lIi1e of tlle dial (Oppl fi le10 Ihe lomhern
or meridiao ooe) is hid frnAl fighl 10 Ihe 6gure, by
~he
axis of Ihe glllbe, The hours io Ihe hollow to whICn
th.t Ililebelong , are alfo (uppo(ed tO be hid by Ihe ob·
Ilque riew of the figure:
bm
Ihey
are
the fame as Ihe
hours in lhe fronl ,hullolV. Thofe alfo in Ihe righl and
left
~and
feo,ieireubr hollows are monIy hid from figll! ;
aod fu . Ito are all Ihole 00 the fides oext
th~
eye of Ihe
(our aculI:
al\~les,
The cooll,uélioo of this di,1 is as follows: (See Plate
LXXI.
(I~.
<}.)
0 0 a Ihick ('Iuare piete of wood, or melal.
dra~
Ihe
lioc!
Q
e
and
hd,
as far Irom caeh other as you IOleod
fnr Ihe thnknr(s of Ihe filie
. hed '
aod in
,he
farne
maooe" dr.w Ihe like
thie~ne(~
o( tI;e olher
Ihr~e
lIikl,
,(g
h.
,
kl lI/,
and
no/,
q,
all n,nding oUlright as
fr~m
the cent re.
Wi h anY cOOl'eoieol
opeoio~
of Ihe
c~mpafT
... as
. !
((o
as
to leave pl?pe, Ilnngth 01 fln[ wb o
Ji'
lIS
equ.l
tO