APPENDIX. 321 



tude to the eastward of the flag-staff of Drake's Island ; 10" 2 to the 

 westward of Plymouth old church, and 0' 25"- 1 to the westward of 

 the new church. Tlie longitude, therefore, of the station, by the 

 Ordnance survey, would be 4° 7' 41"-7, but by applying a proportion 

 of the error detected by Dr. Tiarks, in liis chronometrical observa- 

 tions between Greenwich and Falmouth, viz., 4'"09 or 1' 11""3, the 

 corrected longitude of the station will be 4° 8' 43". Our chrono- 

 meters made it 0' 40"' 2 to the eastward of the corrected longitude, 

 and 0' 19"'6 to the westward of the original determination by the 

 Ordnance survey. 



The Breakwater being the point from whence all my differences are 

 measured, I have considered its longitude west of Green^vich to be 

 as above stated, namely, 4° 8' 43". 



It now remains to record the results, the details of which are 

 given in another form.* 



Madeira. — The obsen'ations were made at Mr. Veitch's garden* 

 house, that being the spot used by Dr. Tiarks with ten chrono- 

 meters. The difference between it and the Breakwater is 12" 45' 45" 



west : the longitude will therefore be 1 6° 54' 28" W. 



which is 0' 1 7'''4 to the eastward of Dr. Tiarks's determination. 



Teneriffe (Fort San Pedro) — by eleven chronometers is 0° 40' 6" 

 to the eastward of Madeira, and will therefore be ...16°14'22""W. 



St. Jago (landing place at Port Praya) — by ten chronometers 

 it was found to be 7° 15' 55" w^est of Teneriffe, and there- 

 fore.,.. 23° 30' 17" 



Rio DE Janeiro (VUlegagnon Island) — by fourteen chronometers the 

 difference was found between it and Port Praya to be 19° 34' 46" 

 which will make its longitude 43° 05' 03" 



St. Antonio (Terrafal Bay at the south-west end). — Inconsequence 

 of unfavourable weather we were unable to land at the north-east 

 end, and, therefore, made our observations at Terrafal Bay ; the lon- 

 gitude of which was found by eleven chronometers to be 9° 05' 39" 

 to the westward of Teneriffe which makes it 25° 20' 1 " 



Tkinidada. — On account of the south-east trade being scant, we were, 

 prevented from making this island. 



Monte Video (Rat Island). — The difference of longitude between 

 this place and Rio de Janeiro was measured, on various occasions, 



* These details are lodged in the Hydrographical Officct R. F; 



