i l ,
i I
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I S
‘ Ml
C a p e P o s s e s s i o n ........................................................ ............................................ I t- s b
T a b l e M o u n t a i n b e h i n d C a p e G r e g o r y 1 5 0 0 t o 2 0 0 0 E s t .
P o i n t S a n t a A n n a ( P o r t F a m i n e ) .......................................................... ' “4
M o u n t S t . P h i l i p d o ................................................................................ >3o 3 A n g .
M o u n t G r a v e s , N o r t h S u m m i t ( D a w s o n I s l a n d ) ...................... i 3’ 5 A n g .
D o . S o u t h d o . d o . . . . . . . . . 1 4 9 8 A n g .
L o m a s R a n g e , t h e h i g h e s t p a r t o v e r P o r t S a n A n t o n i o . . 2 9 6 3 A n g .
/ 2 6 0 2 B a r . 4 O b s ,
M o u n t T a r n ( P e a k a t t h e N . E . e n d ) ......................................................., ^ 8 5 2 A n g .
M o u n t B u c k l a n d , G a b r i e l C h a n n e l 4000 E s t .
M o u n t B o q u e r o n ( e n t r a n c e o f M a g d a l e n C h a n n e l ) 3 » o o E s t .
M o u n t S a rm i e n t o ( b o t t o m o t d o . ) 6 8 0 0 A n g .
P y r a m i d H i l l ( d o . d o . ) 2 5 0 0 A n g .
C a p e F r o w a r d ( L a n d b e h i n d t h e M o r r o ) 2 5 0 0 E s t .
C a p e H o l l a n d ..................................................................................................................
M o u n t P o n d ..................................................................................................................
r 2 2 9 0 B a r .
M o u n t C r o s s , P o r t G a l l a n t ................................................................................ ( 2 2 6 4 A n g . 3 O b s .
A v e r a g e h e i g h t o f t h e l a n d n e a t S e a R e a c h l o o o t o 2 5 0 0 E s t .
O U T E R C O A S T O F T I E R R A D E L F U E G O .
K a t e r P e a k , o n H e r m i t e I s l a n d ................................................................ '7 4 2 B a r . 4 O b s .
B e l l M o u n t , n e a r S t r a i t l e M a i r e 4 0 o o E s t . »
N o i. r XI s l1 a n .d5 ............................................................................................ .................... ........ 6 0 0 E s t .
SO U TH P A C IF IC O C F A N .
W E S T E R N C O A S T O F P A T A G O N I A .
M o u n t B u r n e y ..................................................................................................
C a p e T h r e e P o i n t s ......................................................................................
M o u n t a i n w i t h i n K e l l y S o u n d .............................................................
S u g a r L o a f (M a r i n e I s l a n d s , i n H o l l o w a y S o u n d ) 1 8 3 6 A n g .
D o m e o f S t . P a u l ( d o . d o . ) ......................
H i g h e s t p e a k o f J u a n F e r n a n d e z ( T h e Y u n g u e , o r A n v i l )
• 2,600 Ang. R. F.
4 8 0 0 A n g .
2 0 0 0 E s t .
1 5 4 0 A n g .
1 8 3 6 A n g .
2 2 8 4 A n g .
3 0 0 5 A n g .
DISCUSSED BY
MAJOR SA B IN E, R .A .,F.B .S.
1. Observations o f the D ip .
C ap ta in P it z -R o y was fu rn ish e d w ith two D ip Circles, one b y
G am b ey , an d th e o th e r by D o llo n d ; th e la tte r su p p lied b y G o v e rn m
en t, a n d G am b ey ’s p u rc h a s e d b y himself.
G am b ey ’s, b e in g fo u n d to g iv e re s u lts m o re a c c o rd a n t w ith
each o th e r th a n D o llo n d ’s, w a s u s e d a t a ll th e s tations, e x c e p t R io
de Jan e iro . T h e Circ le was n in e a n d a -h a lf inche s in diam e ter,
a n d was fu rn ish e d w ith tw o needles. T h is in s trum e n t was, in all
re sp ec ts , a v e ry su p e rio r one. I t wa s p la c ed fo r ob serv atio n on a
stan d , w h ic h ra is ed it from tw o to th re e fe e t above th e g ro u n d .
T h e n e ed le was o b s e rv ed in e ig h t p ositions, a n d as th e re a d in g s
acco rd ed sufficiently well w ith e ach o th e r, th e ir a rithm e tic a l mean
has b e en ta k e n as th e d ip r e s u ltin g from th e o b s ervation. T h e
e ig h t positions w e re as follows ; 1 , w ith th e g ra d u a te d face o f th e
circle tow a rd s th e e a s t; 2, w ith th e same tow a rd s th e w e st. T h e
needle was th e n ta k e n o u t a n d re p la c ed w ith th e e n d s o f th e axle
ch an g ed , so th a t each e n d re s ted on a differen t p la n e to w h a t it
did b e fo r e ; i t was th e n o b serv ed , 3, w ith th e face o f th e c irc le
tow a rd s th e w e st, a n d 4, w ith th e same to th e east. T h e poles
we re th e n in v e rte d , so th a t th e e n d o f th e n e ed le w h ich was be fo re
a n o rth pole b e cam e a so u th pole, an d th e fo u r po sitio n s w e re ag a in
rep e ated . T h e a rc in d ic a te d b y b o th en d s o f th e ne ed le w a s re a d
in ev ery p o s itio n : a n ob serv atio n o f th e d ip consisted, conseq
u e n tly , o f s ix te en re a d in g s. In th e su b jo in ed ta b u la r re c o rd th e se
are com p rised in fo u r en trie s , a mean b e in g ta k e n o f th e a rc re ad
a t th e tw o e x trem itie s o f th e n e edle, a n d o f th e po s itio n s 1 an d
3, 2 a n d 4 : 1 a n d 3 form th e column, a ; 2 a n d 4 th e co lum n , a ';
and th e same positions, w ith th e poles re v e rs ed , th e columns
a" a n d a'".
V O L . : . ' 2 k