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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0853
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TI -1 - O = 3, 0625820 = 1154 9
1I = O
2. 6074550 = 405
ThaIFZ = 9, 8907234 =
Sum = 12, 4981804
370 52
T, hals X. 9. 4355984 = 15 13
Then will HaIF Z -] - hate X = 53 DegreC
 Minures = b: and HalE L. = haltX = 22DC
Brees 37 Minures = c.
AS F
Civen F, an O. Required B.
Bb = 2, 352182
Z b = 9. 778267F == 5308
And Wohen etius the Nature, Reason, and Me-
chod ot Operation in the Calculacins ol ie siles
and Anoles ot Oblique Trianoles, is tully under
Aood; is Applicarion, Ose, and Practice, will be
very catre and plain, cho ils  De very large
and ample. FOr,
First, Yyou Have a mind E0 apply it eo wtat
cher cal Oblique Sailing, er the Doctrine oF Ob-
liquo Plain Frizonometry, applied ro Sailins; your
Former Triangle and Cales Wlcach all thac vou
can desire.
A5 Suppose a Strix Coasting alons by the Store
From thie Place b, sers an Hlead Land by Hes Com
PaIS, (a5 c) and finds ic ro bear From her 3. 1. H
then Ihe Cails on, W. S. WV. ST. 5 Miles OF MI-
nutes ro a; and ihen Ainds chac che Hlead Land
bears From her Full S. F.
Tis required ro derermine hex distance trom
ehiis LTead Land whien Me as ac b, and no MC
5 2E a
Find the Angles b and c, by Case 4. chen,
S, b = 3. 9031084 = 530 8
TT = 2, 8920916  980
5, a = 9. 9864273 = 104 15) 
Sum = +2, 8785219
B = 2. 9754135 = 94
This is che Sine oF 14. 45, che Suxple
oF 104. 15, to a Semi circle.
AS F VI
Oiven H, O, D. Required Threc Aneles.
B. FT-1 O::
=ZX = C
EI. R: = Bc, ZC: and O. R: : Bb
B = 2. 9754318 = 945
FI - ] O = 3, 0622058 = 1134. 3
II -- O = 2. 6074540 = 405. 1
EB = 472 = 5. 6696058 =
e X
FI = 2, 8920453 = 7801
2B L Lx = 750
1 1 = X225R = 10.
BC = 2. 8573225 = 920
26 = 9. 9652672 = 223 37
2. 6942280 = 495
First, FoPlor che Triansle
Dra a Arait Line as B, reprelen the ArP
bearine ot the Head Land, wvhicH W25 3. S. WV
Then From 6 Points FalEC 2, and TheTC TCILAIII 4
15
because che Shrip Saild West Souch West,
makre the Angle b equal 10 45, atet (0 will che
Line O reprelent the Distance Pailed, alu b vilt
be the Course. Prick oH che Distanceun, viz
Pr. 5 Mtiles trom B1o a. Then becaule the Strip
Pailed NV. S. WV. che concrary Rumb llom a tob.
mustbe B. IV. P. And since the Soucit Lac lub
makes wich chac, an Ansle oF 670 30, sou muct
make ehe Angle aE a juse 67 301. S0 Wi MC
Linc FT, Wten drawn, interlect che Line B in Mhe
Poine ot the Sicvation ot the Ilcad Land c; and
Oy chac means ill the Priangle be compleated.
This beins donc, il vou pleale, (eho Plouine
the Triangle is nor ot ablolure necetr, bul nis
Osetul and Instructire) ihen consider, chat it must
De a Cale oF Oblique Plain Trianeles, Wvhere is si
ren che angles a and b, and che Side O. Requi-
red H and B.