INTRODUCTION. 
343 
After remaining a sufficient time to examine the index and other corrections of the 
instruments, and to obtain the necessary data for eliminating the effects of the ship’s 
iron on the magnetic results obtained during the voyage, the Pagoda quitted King 
George’s Sound on the 27 th of April and returned to the Cape of Good Hope, touch- 
ing at Mauritius by the way for the purpose of repeating the observations on the in- 
fluence of the ship’s iron. She arrived at the Cape on the 20th of June, having con- 
tinued the practice of observing the magnetic elements daily on the return passage, 
in the same manner as in the high latitudes. 
The voyage was performed without accident or loss of life, and the crew returned 
in perfect health, due doubtless in great degree to the supplies of warm clothing and 
preserved meats, which, by direction of the Admiralty, Lieut. Moore had taken with 
him from England. 
No failure occurred in any of the instruments notwithstanding the continual use 
in which they were kept by the zeal of the observers. If where so much was so well 
accomplished it is permissible to feel or to express regret on any account, it can be 
only that circumstances should have prevented the completion of the survey in the 
high latitudes as far as the 125th degree of longitude according to the original de- 
sign, whereby the observations of the magnetic force would have been carried up 
to the principal axis of the isodynamic oval of 2‘00. 
On the conclusion of the voyage Lieut. Clerk received directions from the Master- 
General of the Ordnance to return to Woolwich, for the purpose of completing the 
reduction of his own observations and those of Lieut. Moore. The following pages 
contain Lieut. Clerk’s report ; in which he has also embodied a series of observations 
on the Inclination and Force with a Fox’s apparatus, made in 1844 by Lieut. Alex- 
ander Smith, R.N., one of the Assistants at the Hobarton Magnetic Observatory, on 
his passage to Van Diemen Island ; and a second series, also of the Inclination and 
Force, made in 1845 by Lieut. Dayman, R.N., of the same observatory, in a passage 
in the bark “ Leander” from Hobarton to the Cape. Both these officers had pre- 
viously been employed in the Antarctic Expedition under Sir James Clark Ross, and 
their observations now communicated are a consequence of the zeal which they im- 
bibed, and the practice in the use of instruments which they acquired, in that expedi- 
tion. Their observations transmitted to the Admiralty were sent to Woolwich for re- 
duction and publication. Lieut. Clerk has also embodied in his report the determi- 
nations of the three magnetic elements made by Sir James Ross in the Erebus in 1840 
on her passage from the Cape of Good Hope to Kerguelen Island, and thence to 
Hobarton. 
On inspecting the map, it will be seen that the tracks of the Erebus and Prince 
Regent held about a middle line between the outward and homeward tracks of the 
Pagoda, and are therefore extremely useful in connecting results which would other- 
wise have been somewhat too far apart. 
Lieut. Clerk has taken the Cape of Good Hope as the base station of the observa- 
tions of the magnetic force made in the Pagoda. The determinations of the absolute 
horizontal force made at the observatory at the Cape in February, March, April and 
2 Y 2 
