APPENDIX. 



331 



dian of the centre of Government House. By the pubHshed survey of 

 Plymouth and Devonport,* the Government- House at Devonport 

 is 0° 1' 48" west of Plymouth old church, the longitude of which is 

 given by Captain King in the preceding copy of his report. 



This longitude, however, differs slightly from that obtained by the 

 Beagle's chronometers carried from Devonport to Greenwich ; and 

 as the longitude of Falmouth, by her chronometers, agrees with that 

 determined by Dr. Tiarks, I have used in the construction of the 

 table of positions (pp. 65-85) the result obtained directly by these 

 chronometers, because so confirmed. 



Principal Results of the Beagle's chronometrical measurements 

 between 1831 and 1836; forming a connected chain of meridian 

 distances around the globe, the first that has ever been completed, 

 or even attempted, by means of chronometers alone. 



Devonport to Port Praya. 



Twenty Chronometers. Twenty-three Days. 



A 

 B 

 C 

 D 

 E 

 F 

 G 

 H 

 K 

 L 



S. H. M. S. 



21,68 



21, 8o 



20,69 20,69 



17,03 



20,33 20,33 



23.03 



21,43 21,43 



17,16 



23,90 



21,12 21,12 



H. M. S. H. M. S. 



M 1 17 20,47 20,47 



N 24,42 



p 17,73 



R 19,90 19.90 



S 20,52 20,52 



V 22,23 



W 20,93 20,93 



X 21,08 



Y 20,58 20,58 



Z 21,43 21,43 



Preferred. 



Mean ... 20.87 

 Ih. 17 m. 20,7s. 



20,74 



Places of observation : 



The Baths, in the meridian of Government-house, at Devonport. 



The landing-place at the west side of Quail Island, Port Praya, in 

 the Cape Verde Islands. 



• In the above-mentioned plan, published by the Admiralty, on a scale 

 of 5,03 inches to a mile, the departure between Devonport Baths and 

 Plymouth Old Church is .5,8 inches ; which in latitude 50° 22' represents 

 0° 1' 48"1 of longitude. 



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