1018 
THE VOYAGE OF H.M.S. CHALLENGER 
The pocket chronometers were kept in a small tray separate from the box chrono- 
meters, so that when they were required . for shore observations they might be taken out 
of the chronometer room without disturbing the box chronometers. The tray in which 
they were placed rested on a solid block of fir secured to a beam. 
Of the sixteen chronometers originally supplied at Sheerness one stopped before 
leaving England, and was replaced at Portsmouth ; one stopped in August 1873, and was 
replaced at the Cape of Good Hope ; and one stopped in December 1875 ; the rest were 
brought home in good condition, with the exception of one pocket chronometer which 
was injured in consequence of the sight-boat having been capsized in the surf at Fernando 
Noronha. 
Directly they were received, letters were given to the chronometers, which were after- 
wards only known by those letters, so that there could be no prejudice in favour of any 
particular maker. 
The following table shows the chronometers supplied, and the letters by which they 
were distinguished on board, &c. : — 
LIST OF CHRONOMETERS IN H.M.S. CHALLENGER. 
Makers’ Names. 
No. of 
Chrono- 
meter. 
When received. 
From whom received. 
Distin- 
guishing 
letter 
on board. 
| 
How disposed of. 
Molyneux, 
2119 
Nov. 22d 1872. 
Greenwich Observatory. 
z 
Returned to England, August 1873, 
(stopped). 
Dent, 
1763 
Do. 
Do. 
A 
Returned at Sheerness on paying off, 
June 1876. 
Hewitt, 
2553 
Do. 
Do. 
B 
Do. 
Carter, 
197 
Do. 
Do. 
C 
Do. 
Park & Bouts, 
801 
Do. 
Do. 
D 
Do. 
Pennington, 
241 
Do. 
Do. 
E 
Do. 
Cotterell, 
Do. 
Do. 
F 
Do. 
Arnold & Dent, 
742 
Do. 
Do. 
G 
Do. 
Pennington, 
1512 
Do. 
Do. 
H 
Do. 
C. Frodsham, 
1765 
Do. 
Do. 
J 
Do. 
M ‘Cabe, 
166 
Do. 
Do. 
K 
Do. 
Mnston, 
658 
Do. 
Do. 
L 
Returned to Portsmouth Observatory, 
Dec. 14, 1872 (stopped). 
Returned at Sheerness on paying off, 
June 1876. 
Lister & Sons, 
608 
Dec. 14tli 1872. 
Portsmouth Observatory. 
L 
R. & H. Molyneux, 
1948 
Nov. 20th 1873. 
C. of G. Hope Observatory. 
M 
Do. 
/Molyneux, 
5778 
Nov. 22d 1872. 
Greenwich Observatory. 
M 
Returned to England, Sept. 1873. 
-$] 
Arnold, 
6221 
Do. 
Do. 
N 
Returned at Sheerness on paying off, 
June 1876. 
° 
Parkinson and 
Frodsham, 
701 
Do. 
Do. 
O 
Do. 
, Molyneux, 
706 
Do. 
Do. 
P 
Do. 
Pennington (Deck), 
1299 
Do. 
Do. 
Q 
Do. 
With these chronometers a regular chain of meridian distances was carried on from 
the date of leaving England to the date of the return of the Expedition, the chronometers 
being rated at each place of observation, except when the stay was too short to permit of 
doing so. For this purpose equal altitudes were in all cases obtained when practicable ; 
