APPENDIX. 321 



tudeto 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. The longitude, therefore, of the station, by the 

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

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

 tions between Greenwich and Falmouth, viz., 4'*09 or V H""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 diflferences are 

 measured, I have considered its longitude west of Greenwich 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 observations 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 12045^45" 



west : the longitude will therefore be 16° 54' 28" W. 



which is 0'17''*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" west of Teneriffe, and there- 



fore 23° 30' 17" 



Rio DE Janeiro (Villegagnon 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).-— In consequence 

 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' 01" 



Trinidad A. — 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 Oflace, R. 



