ON  THE  PEAK  OF  TENEEIFFE. 
501 
On  xAugust  15th,  the  night  of  the  full  moon,  the  altitude  of  the  moon  being  42°,  three 
readings  of  the  needle  with  the  cone  of  the  battery  turned  towards  the  moon,  compared 
with  three  readings  before  and  three  readings  after,  when  the  cone  had  been  turned  in 
azimuth  about  20°  east  of  the  moon,  gave  a heat  effect  for  the  moon  : — 
Sidereal 
h 
time. 
m 
o 
At  21 
11  . 
. . -fl-0 
At  21 
17  . 
. . +0-1 
At  21 
20  . 
. . +1-9 
At  21 
24  . 
. . +0-2 
At  21 
27  . 
. . +0-3 
At  21 
31  . 
. . +0-2 
At  21 
35  . 
. . +0-6 
At  21 
37  . 
. . +0-7 
At  21 
44  . 
. . +0-1 
At  21 
46  . 
. . +0-5 
Mean  of  ten  groups,  each  group  con 
sisting  of  nine  observations  . 
:} 
+0-56 
Then  comparing  the  moon  readings  with  readings  west  as  well  as  east,  before  and  after, 
the  following  results  were  obtained ; — 
Sidereal  time. 
h m 
0 
At  21  48  . . 
. +0-3 
At  21  50  . . 
. +0-5 
At  21  52  . . 
+ 0-3 
At  21  54  . . 
+ 0-3 
At  21  56  . . 
+0-2 
At  22  1 . . 
+ 0-1 
At  22  3 . . 
-fO-1 
At  22  5 . . 
+0-2 
At  22  7 . . 
+ 01 
At  22  9 . . . 
+ 0-2 
At  22  11  . . . 
+ 0-2 
At  22  13  . . . 
+0-5 
twelve  groups  . . . . 
+ 0-25 
Placing  one  of  Price  s candles  (for  his  emigrant’s  ship  lantern)  in  a square  tin  lantern, 
blacked  inside,  with  the  door  open,  on  a tripod  at  a distance  of  14  feet  9 inches  from 
the  thermo-multiplier,  and  taking  exactly  as  in  the  case  of  the  moon,  groups  of  readings 
for  east  of  the  candle,  the  candle,  and  west  of  the  candle,  the  following  results  were 
obtained  for  the  heat  of  the  latter : — 
