Seconds Pendulum, and the EUijrticity of the Earth. 249 



Places. 



Latitude. 



Pen- 

 dulum by 

 expert 

 ment. 



Com- 

 puted 

 Pen- 

 dulum. 



Excess 



of 

 Calcula- 

 tion. 



Observers. 



Falkland Islands 



Paramatta 



Rio Janeiro . . . 



Bahia 



Maranham 



Trinidad 



Madras 



San Bias 



Formentera ...... 



New York 



Figeac 



Bourdeaux 



Clermont '. 



Paris 



Dunnose 



Dunkirk 



London 



Arbury Hill 



Clifton 



Leith 



Portsoy 



Stockholm 



Unst 



Hammerfest 



Greenland 



Spitzbergen 



51 31 

 33 48 

 22 55 



12 59 

 2 31 



10 38 



13 4 

 21 32 

 38 39 

 40 42 

 44 36 



44 50 



45 46 

 48 50 



50 37 



51 2 



51 31 



52 12 



53 27 

 55 58 

 57 40 



59 20 



60 45 

 70 40 

 74 32 

 79 49 



43 S. 



43 



22 



21 



43 



56 N, 



9 

 24 

 56 

 43 

 45 

 26 

 48 

 14 

 24 

 10 



8 

 55 

 43 

 41 

 59 

 34 

 28 



5 

 19 

 58 



39-13927 

 39-07696 

 39-04374 

 39-02425 

 39-01214 

 39-01884 

 39-02338 

 39-03881 

 39-09424 

 39-10168 

 39-11322 

 39-11303 

 39-H809 

 39-12929 

 39-13614 

 39-13773 

 39-13929 

 39-14250 

 39-14600 

 39-15554 

 39-16159 

 39-16541 

 39-17146 

 39-19519 

 39-20335 

 39-21469 



39-13942 

 39-07622 

 39-04331 

 39-02223 

 39-01210 

 39-01881 

 39-02235 

 39-03978 

 39-09297 

 ;9-l0034 

 39-U447 

 39-U530 

 39-H932 

 39-12979 

 39-13620 

 39-13767 

 39-13938 

 39-14190 

 39-14620 

 39-15483 

 39-16051 

 39-16588 

 39-17034 

 39-19722 

 39-20525 

 39-21356 



+•00015 

 -•00074 



— -00043 

 -•00202 



— -00004 



— -00003 

 -•00103 

 +•00097 



— •00127 

 -•00134 

 + •00125 

 + •00227 

 + ■00123 

 +•00050 

 + •00006 

 -•00006 

 +■00008 



— •00060 

 +•00020 



— •00071 

 -•00108 

 +•00047 

 -•00112 

 +•00203 

 +•00190 

 -•00113 



Dupcrrey*. 



Sir T. Brisbanef. 



Hall and Foster. 



Sabine. 



Sabine. 



Sabine. 



Goldinghamj:, 



Hall and Foster § 



Biot. 



Sabine. 



Biot. 



Biot. 



Biot. 



Biot. 



Kater. 



Biot. 



Kater. 



Kater. 



Kater. 



Kater. 



Kater. 



Suanberg || . 



Kater. 



Sabine. 



Sabine. 



Sabine. 



The errors in this table are not great, yet in the few in- 

 stances whei'e they are considerable, it is greatly to be wished 

 that the experiments were repeated. In particular it would 

 contribute much to render our ideas on this subject more fixed 

 and certain, if the French philosophers would, by new opera- 

 tions, determine the pendulums at Figeac, Bourdeaux and 



* Con. des Terns, 1826. From the experiments of M. Duperrey with an in- 

 variable pendulum, the proportion of the seconds pendulum at the Falkland 

 or Malouin Islands, to that at Paris, is 1*000255 to 1. These islands and 

 London being in the same latitude south and north of the equator within 

 about half a minute, the exact agreement of the two pendulums is a new 

 proof of the delicate precision with which the experiments at the stations 

 of the Trigonometrical Survey in Great Britain, have been executed. 



f Phil. Trans. 1824; and Con. des Terns, 1826. % Phil. Trans. 1822. 



§ Phil. Trans. 1824. The length in the table is Mr. Foster's result. Capt. 

 Hall found 39*03776 to which he gives the preference, because the operations 

 were executed under more favourable circumstances. On the contrary, Mr. 

 Foster's result agrees much better with other experiments, which seems to 

 be a just ground of preference. This shows the delicate nature of these 

 experiments ; and we may learn with what caution we ought to resort to 

 the healing power of local attraction. 



|| Swedish Transactions 1825. This pendulum was determined imme- 

 diately in English measure. 



Vol. 68. No. 342. Oct. 1826. 2 I Clermont 



