Captain HalPs Notice of a Voyage ofResearcli. S61 



and other scientific observations made, without interfering with 

 the primary object of useful and practical investigation. 



The first part of the voyage might include Madeira, Tene- 

 rifFe, one of the Cape de Verds, Bahia, Rio de Janeiro, Monte 

 Video, Buenos Ayres. The next would include the Falkland 

 Islands, where there is a harbour exactly in the correspondent 

 latitude of that of London ; Cape Horn, where there is a secure 

 port almost in the opposite latitude to that of Leith Port, and 

 consequently affording stations well suited for swinging the 

 pendulum, in order to have, as nearly as possible, similar obser- 

 vations in the southern as in the northern hemispheres ; thence 

 to the coasts of Chili, Peru, and Colombia, as far as the Equa- 

 tor, and also to the Gallapagos Islands. The third division 

 would sweep the Pacific as far as New Holland, including the 

 various groups of Islands in that interesting region. The next 

 would take in various stations amongst the Islands of the East- 

 tern Archipelago, lying between New South Wales and China. 

 The fifth division would include the Straits of Malacca, the 

 Presidencies of India, Ceylon, the Mauritius, and the Cape.* 

 The last would take in St Helena, Ascension, the West Indies, 

 Bermuda, Charlestown, the Azores, and England. 



With the exception of one or two, there is none of these 

 places where it would not be useful to the practical seaman to 

 be well acquainted with all, or most, of the points mentioned in 

 the foregoing sketch. Some of the names of the places mentioned, 

 however, have been introduced for the purpose of completing the 

 important series of pendulum experiments, having the effect of 

 local density for their object, and keeping in view the necessity 

 of selecting stations along the same parallels of latitude, but 

 differing as much as possible in the nature of the ground. The 

 following may be stated as two parallels singularly well suited 

 to establish the point in question. 



Northern Series. 



Names. 



Madeira, 

 Bermuda, 



Charlestown, 



Mogadore, coast \ 

 of Africa, j 



Latitude. Nature of the Ground. 



324 jinsular, volcanic. 

 32^ Do. calcareous. 



„„» .Continent, allu- 

 ^^4 vial. 



324 Do. Sandy desert. 



