DEAE 
2. Asthe fine of the fourth are is to the eofine of the 
fifth arc, fo ig the fine of the latitude of the place to the 
fign of the altitude for the given bour and declination. 
The altitnde in the middle of the fin may either be had 
by taking the arithmetic mean between the next greateft 
and leait, or by computation in the manner above direCted. 
Leybourn’ s Dialling, Tract vi. p. 23, &c. 
To find the altieade by the globe, fee Grose 
ie on a card, is reprefented in te. 29. an: 
Draw the occult line AB 
. ee it at 
hour-lines 7, 5, #; 
o’clock line EC. 
divided into four equal parte, they will giv 
raw. the right lines 
u,v, w, and x, all ae 
eae as in. fig. 29. 
lines. ECD and ADo draw the rizht line FDG at right 
ely to ADs. Lay a ruler to the points A and R, an 
draw. the line A R F through 234 degrees of fouth declina- 
tion in the arc S R3 and then laying the ruler to the points 
A and T, draw the line ATG throug 233 we yo pe 
declination in the arc ST; - el ine F a 
A FG cut the line FD Gi e proper aan for the 
{cale of months... Upon the centre D, with the radius D F, 
defcribe the femicircle Fo G, h divide into fix equal 
ic of VS; with the fame extent, fetting one foot in G, 
ieeeue the arc A E QO for the tropic of @. Next fttng 
one foot in the point 4, and extending the other to e= 
{cribe the arc A.C I for the beginnings of the figus x and 
q ; and with the fame extent, fetting one foot in the point 
‘ we the arc A N for the beginnings of the figns 1. 
Set one foot in the point i, and having extended 
‘he other to A deferibe the arc A K fo r the beginnings of 
and extending the ed to A ; 
ay of the year 5 and where the ruler cuts the lin ‘ 
make marks, and place the days of the months cont againft 
thefe marks, as in 2Qe. Laftly, draw the fhadow line 
PQ parallel Ms the oecult line A.B; make the sang 
and iet the hours to their refpective lines, as fig. 20. 
the dial will be finifhed, 
The lines 2d, a5, and &:c, of the gnomon, muft be cut 
ay through the card; and as the end a4 of the gnomon 
3 raifed occafjonally above the plane of the dial, it turns 
on anhinge. The dotted line 
jt a {mall bead for fhewing the hour 
To rectify this dial ; (ie the nee in the “i right again{t 
e curve lines. 
6 Gnd the hour of the day ; rife the gnomon, so 
the ee of the dial next the 
noo 
fiud the time of fun- rifing and fetting ; move the 
thread among our-lines, until it either covers fone 
e year to which the thread is fet in the fcale of 
months, 
To ae as fun’s declination; ftretch the thread from the 
ay of the month over the ang ular point at XII, and it will: 
cut the ain 3 s declination, as it is north or fouth, for that day,.. 
in the prop¢r 
o find on ae day the fun enters the figns ; when the 
bead,.as above redtified, moves along any of the curve lineg. 
which have the figns of the zodiac marked upon them, the 
{fun enters thofe fizns on the days pointed. out by the 
thread in the feale of mon Se 
ta, Univerfal, on a plain croft i i oi eas by figs 33+ 
and is moveable on a joint, C,, for elevating it to any given. 
latitude on the quad-ant Co go, as it ftands upon the hori. 
zontal boar The arms of the crofs ftand at right an-. 
gles to the middle part; and the top of it, from ato 2, is. 
of equal length with any of the arms ne or m 
nis dial is rectified, by fetting the midd le line ¢u ta. 
the latitude of the place on the quadrant, the board A 
level, and the point N northward by the needle; thus, the 
plane of the crofs will be parallel to the plane of the equar. 
tor. Then from ae o’clock in the morning till VI, the 
upper edge, £/, of the arm, éo, will catt a fhadow on the 
time of the day on the fide of the armem; from VI till LX, 
the lower edge, 7, of the arm, 70, will caf a fhadow on = 
hours,.on the fide og. From 1X in the morning to XII a 
noon, the edge, a 4, of the top part, an, will caft a thadove 
on the hours on the arm zef; from XII to III in the af, 
ternoon,.the edge cd of the top part will caft-a fhadow on 
the hours of ey arm kim} from II 
2) 
rtp qs 3 
and from VI vil IX, the fhadow of the edge, ef, rill fhew 
an time on the top partaz. The breadth of each part, 
b, ef, &c. muft be fo great, as never to let the fhadow 
fall quite aie the part or arm on which the hours are 
marked, when ,the fun is at his greateh declination from the 
equator. 
To determine the breadth of the. fides of the arms which 
contain Hite hours, fo .as he : in i argh to their 
t, ed, mult be equal to ed or dB. Butt in order t 
ihe fhadow within the ae divifions of the feu. = 
