r/u/, l sT,t l os.v,,//,xvi/.T,,/,^Kvn r.p. 708 . 
GE OME TRJ CAL OPER A TIONS 
The D afe AB , situated on ^perfectly levdTlaih^as meafired Grice in 
contrary directions, be/ween theD arracks ofAbcrmcnai and t/re bottom 
ofDmas Di/lflc , an ancient Dnti/h fortification, on the Sea- Sho/r . 
The length ofthcJron (Train made use of on (hit occasion am* ascertain'd 
by means of accurate Deal Hods, applied, to it everyAforning ( YTrcnin g, 
before and a/ler the operation of the Field . The two measurements agr- 
eed to within iff than a* Toot, and made (he length- of the Dase — 
jjojtrT ThisDase AB f was aflerwards prolonged to C , the Top of 
the Dinas bp means of the side DaseHY 411 y fid . Thus the di/lancr 
BC , being 482.2 feet/ the tota/ fase A C amounts to 14J6 8 2 feet . 
~R,Aigh Watermark Heap Tide . J) . a small JEminence called the Di- 
god , T, the Toot JIM of Carnarvon . S , The Teak of Snowdon . J 5 , A 
Cairn of Stones on Jfoel Tilio . 
Thefatitude of Carnarvon was found to be S 3 -A 4 7 > tmd the Va- 
riation of the JVeed/c, by two Azimuths of the Sun, taken on the zjfof 
Aug*, at 2.2 and .fir. T.Af. 22. 18. 30 we/lcrly . 
The FTeight ofhfoel, T ilia above Carnarvon tfu/i)' 2371 Feet, result- 
ing from the simplest operation on the Digod, the nearest point to 
the Adi, is to be preferred to that deduced from the Angles ofT/eva - 
turn taken from A . 
Angli 
Triangles 
DEB ana DAE 
For t/te dfrfanc y 
Moci Fiiio from 
Hand A. . 
CAT ,/ort/u- 
di/lancr o/ thr 
TootJTM frvmA.. 
Angles 
For t/d I \ 
from C Hep S' ro.04.zO || . Altiludt gf j ) 
S no tv don I 
above Hand the | 
Sea at Carnarvon} 
am. The time not admitting of any actual Survey of the Environs of Carnarvon CfSnowdon to be made .theVtan is only V 
to be consider'd as a flight Sheitir attended merely to convey a general Idea of the nature of the Country where the Triangles nerr/Uurued . 
and 1 j 
Deprefrioni 
\ j 
Relative Heights - 
Tor the ~ 
^Altitude of 
Snore doll 
above Yt arrdU . 
5 above B Trigonometricall)' 
r/ure CSjRe/raction - .... 
Aright of the Jnftrumrnt . . 
5 above'H 
C above's TYigZ- 07-8 
Inflrume/rt, ..4A 
C abovcJS tor -0 
C abovclSTrigC r J 4 • 8 
Tnflrumenl .4.6 
above tf *00-7 
J/cnce HaboveH 
Sjtowflon above- the Sea atTS 
8 above D TrigC 
Curvature CP Re faction 
Inflrument 
6 above D .. 
D above Forth Angie of 
Carnarvon (Tuny bydeveffd 
fertuat Srpa/irr ofthrBanmte/rrj 
(tuny above High Water tPTide 
Snowdon above the Sea 3 se«. 7 \ 
38 fP£_ 
JJJf'. J 
17 - ‘ 
338), ■ 
Relative Heights" 
(( 
Tor t/ie Altitude 1 
E above D TtigC 
Curvature CP. lie fraction ... 
lttflrument 
218s ■ 8 
1C. 3 
4- c 
ofMoel Tilio \ j 
above D , and ( 
( E above D 
1 D above far nan- ore Ouay 
XZ047 
id 6 . 3 
the Sea, at I 1 
Carnarvon . 1 
Vertical defiance otBtuvm- 7 . . 
Ouay above Meap Tide, 
( Mod Tilts above the Sea - . . - 
28 7c 0 
13 
l 
*384. 
2331 ■ 6 
£ / ve A Trig ' 
1 
! Curvature C "Refraction .... 
Tnftrurncnt 
1 effort Tilio above A 
ty.i 
4 -d 
13 da- 3 
Tor the Altitude 1 | 
vfMoclTilw I 
above A, a/rd < 
the Sea at 
Crmari'on . 
1 T above AJrtgC - 
\ Curvature & Refraction 
tnfn/tnent 
\ T above A 
T above Carnarvon Ouay . 
178.6 
46 
4.6 
187.7 
16 6. a 
\ Quay above A 
i Tlencc the /'ertieal di/bmee I 
of the Barometers f 
M. x/Tibb a hot cJVeap Ade.^ 
*384-* 
|| 
Sarirr Sndp ' . 
P L A I 
OF THE 
Triangle s 
■ made up o/p/r obtaining 
the Geometrical Diltance and Altitude 
Op SJVO PfA) OJST mufMOEL Eizio 
lord/ n/pect to /tie Sea aP 
C A R J\ r .A R VO JV . 
Augfiygs. 
Scale of Teet . 
