DiI 
o’clock'line fes take the latitude of the place with the com- 
Pad feo in the feale of latitudes, and fet that oe from cto e, 
and from @ to 
, and at ame rears , aud draw the 
right lines ed and f 5, cach of which will be equal in length 
to the whole fcale GF hous When this is done, fet one foot 
T, 25354, 5, and 6; on eich the quarters may allo be la id 
down, if required. Then, laying a ruler on the point cy 
draw the firit five hours in the afternoon from that poin nt 
through the dots at the numeral figures 1, 2, 3, 4, 5, 
the line de, and continue the lines of Til ane Vv ak 
the centre ¢ to the other fide of the dial for the like hours of 
the morning ; then lay the ruler on the point a, and draw 
e laft five riety in the forenoon through the dots 5. 4. 3: 
VII dicate the centre a, to the other fide, for the like 
hours of the evening ; fet the hours to the refpeétive lines, 
and make the enon in the manner already direGed for the 
horizontal dial 
n ere fouth dial may be made by taking the co-lati- 
tude of the place from the feale of latitudes, and proceed- 
ing in all refpeéts for the hour-lines, as in the horizontal 
ial; only reverling the hours, as in fig ig. 15. and making the 
angle of the ttyle’s ain equa 2 the co-latitude. 
n hor:zontal dial _m 
Ss 0 With 
in ot defcribe 
¢ into twelve equal parts, 
beginning at L; then connedt the divifions, which are equi- 
diftant from L, by the paralicl lines K M, IN, 
and F Q. Draw V Z tor the hypot thenofe of the ftyle, 
making the angle V Z E -qual to — tatitude of the place ; 
and continue the lin: V Z to e line Rr paral- 
lel to the fix o’clock line, and fet off Ge citance : K from 
Zto Y, the dittance 1 from Z to X, ¢ H fro to W, 
dG from x to T, andeF from ZtoS. The ee the 
lines Ss, T'#, Ww, X x, and Yy cach anil toRr, 
Set off the diftance y Y ee to Ir, and from fto 1; the 
re) 
eee 
diftance x A, from 
Then leying a ruler to 
the centre z, draw the forenoon hour-iines through the points 
10, 9 and laying it to - centre 2, paid the 
afternoon lines tnrough the points 1, 2, 3, 4, 53 continu- 
ing the forenoon lines of VIL and vil through 2, to the 
oppofite fide of thedial, for the like afternoon hours ; and 
the afternoon lines ITIL and V through x for the like 
morning hours, Set the hours to the lines, and ere& the 
ftyle, and ae dial is ee A fouth dial may be con- 
flructed in the fame ma 
tude of the ae &c, reverfing the hours, as in fig. 15. 
Fergufon tb? fupr 
1AL, Vertical, is ¢ that drawn on the plane of a vertical 
SS See VERTICAL. 
thefe there are ieveral varieties according to the verti- 
cal pitched upon. . The verticals chiefly ufed, are the prime 
AL, 
vertical, and -the peau 
fouth. north, ea and we 
ials which refpec& fi cardigal points of the horizon, 
are particularly called dire&t dials. Sce Direc 
any other vertical be chofen, the dial is faid to decline. 
Farther, if the circle, whofe plane is ufed, é perpendicu- 
lar to the horizon, as is fuppofed to be the ‘Gale iiv-all hole 
now mentioned, the dials are Searemeel denominated ere&. 
£. gr. cre&t fouth, erect nor 
Hit which refpeétively arife, 
dials. 
are sua to incline or roclirt 
Dia outh, or, more par aes larly an ere? dired fouth 
Dist, is ve deened on a {urface of the prime vertical 
circle ean! towards the 
the fun then aiuaaes the plane of the prime verti- 
cal seh to the fouth, when, in its progrefs, he paf- 
fes fr the m 
from fix in the morning to fix at ia 
vertical fouth.—On he plane of the prime 
vertical inching ake no draw a meridian line A B 
13.) and taking aad inte 
magnitude of the futu 
an indefinite length CD nd mak 
gle C onte ‘equal to the eleva- 
tion of the equator, and drax ae. ale t lit 
the meridian in E. Thro ough E dra 
cutting the meridian A B at right aigles 
to ED, and with this radius deferibe a quadr EF. 
The reft is performed as in‘ 
will the fhadow of any of ae indexes touch the 
feveral pes lines, at their refpeCtive hours. 
AL, North, or ereG ce north Aas is that defcribed 
on the furface of the prime vertical looking northward. 
ince the fun only illumines this furface while he advances 
m the ea 
Gate vertical to fince he is in the prime ver- 
tical at fix o ‘clock i in the morning, and at fix in the evening ; 
a north dial fhews the hours‘before fix in the morning, and 
thofe after fix in the evenin tumn 
al 
there: 
Diar, To de alias a nan north. Draw a meridian line 
EB, (Plate Ll. fg. a 
cleat pleafure. At A nears the angle to the 
elevation of the equator, and from aaa A iciae t C, taken at 
pleature, ere&t a perpendicular C D, inD. 
ake another angle, CDE, likewsfe eae to aa clevation 
of the equator, and draw likewife aline D E, meeting AE 
right angles ; and from the centre 
B, with the radius I B, ‘deferibe a quadrant, which divide 
into fix equal parts: through the two extreme ‘divifions 
draw lines from the centre B, viz. B 4, and B G, mee ting 
G H in 4 andG, and make I d equal to I hand lH a 
th 
Otherwife the plane, being cbig to the horizon, they. 
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