344 APPENDIX. 



Observatory at the R. N. College at Portsmouth to 

 Greenwich. 



Eleven Chronometers. Eight Days. 





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



H. M. 



S. H. M. 



s. 



A 



0 04 22,35 0 04 22,35 



L 0 04 



24,07 0 04 



24,07 



B 



24,57 24,57 



N 





26,63 



C 





0 





29,17 



D 



26,73 26,73 



S 





23,29 



ri 



yy 





V 





21,81 



U 



29,79 













Mean . 



•• 25,23 



24,77 







. Oh. 04m. 



24,8s. 











H. M. 5. 







Angra to Devonport ... 





1 32 09,7 







Angra to Falmouth 











Falmouth to Devonport 





0 03 30,2 







Devonport to Greenwich 





0 16 40,3 







Falmouth to Greenwich 





0 20 10,5 







Devonport to Greenwich 





0 16 40,3 







Portsmouth to Greenwich 



0 04 24,8 







Devonport to Portsmouth 



0 12 15,5 











ro 04 24,8 







Again 



<0 12 15.5 











to 03 30,2 







Greenwich to Falmouth 





0 20 10 5 





While looking over the preceding results, enquiry may be made 

 for those of the other chronometers : I should, therefore, mention 

 that the others were useless. Some of the watches stopped ; others 

 altered their rates suddenly ; and in one case (R) a mainspring broke 

 when the chronometer had been going admirably, till that moment. 

 Four chronometers were left with Mr. Usborne, on the coast of 

 Peru, and in consequence of these diminutions of our original num- 

 ber, there were but eleven watches in tolerably effective condition 

 during the last two principal links of the chain, namely, from Port 

 Praya to the Azores, and from the Azores to Devonport. 



Five years is a long time for chronometers to preserve their capa- 

 bility of going steadily, under various changes of climate, without 

 being examined, and perhaps cleaned or fresh oiled, by an expe- 

 rienced chronometer maker. 



