436 Different “ Rates” of Pennington’s Astronomical Clock; 
tual measurement *, says: “ et s’il compare le degré du 
Cap de Bonne Espérance aux degrés mesurés dans Il’hémisphére 
boréal de la terre, il y a lieu de croire que les deux hémisphéres 
boréal et austral sont différens entre eux. La figure de la terre 
est done trés composée, comme il est naturel de la penser, lorsque 
on fait attention aux grandes inégalités de sa surface, a la dif- 
férente densité des parties qui la recouvrent, et aux irrégularités 
du contour et de la profondeur des mers.” 
If these reflections be correct, how absurd and unphilosophical 
must be the procedure of those persons, who make the coinci- 
dence or the want of coincidence of a result (deduced from one or 
two experiments) with an assumed value of the compression, the 
test of the accuracy or the inaccuracy of the experiments them- 
selves! 
As the attention of men of science is now drawn, and is likely 
to be drawn still more, to the subject of experiments with the 
pendulum, it may be useful to collect together the principal re- 
sults which have been furnished during the last and present 
century with regard to this point. These | shail present in the 
following tables ; in which the several measures of the pendulum 
and corresponding forces of gravity are, for the more convenient 
comparison, referred to the length and force at the equator as 
the standard unit. Naas 
I. Places having North Latitude. 
Comparat. | Length, if 
Place. Latitude. | Length of Observers, (Compression 
Pendulum. =e ; 
Equator ...... 6° Of O”"} 1-00000 | | Bouguer | ~ 
Portobello...) 9 54 0] 1°€0020  |Bouguer At Me 
Pondicherry ..{ 11 56 0 | 100041. |Gentil | 1-000172 
Madras ...... 18 4 O | 1-:00079 {Sir J. Warren 
Umatas’. 42%. 13 17 52 | 1-00032 |Ciscar, &c. 
Manilla ...... 14 55 49 | 100087 |Ciscar, &e. At 15° 
Manilla ...... 14 35 49 | 100082 |Gentil 1-000381 
Acapulca..... 16 50 49 | 1:00075. |Cisear, &e. 
Jamaica, Be as 18 0 O | 1:00114 (Campbell 
St. Domingo 18 27 0 | 1°00097 ‘|Bonguer ava ae 
Macao) sit 2i3 22:12 0} 160061 |Cisear, &e. 1000666 
Malta cas Sos 35 5& 0 | 1:00262  |d’Angos 
anit es a. ek. 36 31 46 100209 Ciscar, &e. At 50? 
Monmerey ...] 36 35 43 | 1°00181 {I iscar, &e. 1001423 
! Pormentera, .. | 38 39 56 | 1:002693 |Biot, Avago, Chaix At 35° 
Tonlouse ..... 43 36 0 | 1:00303_ jd’Arquier 1001872 
Pigesct. .5. 3. 4436 45 | 1:003199 | Biot, Mathieu Ab sOo 
Bordeaux ....| 44 50 25 | 1°003181 |Biot, Mathieu 17002352 
Clermont..,..| 45 46 48 | 1°003322 |Biot, Mathieu 2.5 
Geneva ...... 46 12 O]} 1°00263 |Mallet At 45° 
Vienng ...... 48 12 47 | 100319 |Liesganig 1009845 
Paris ......-.| 48 50 14 | 1:00332 |Bouguer < 
PSMIS) sta esac 48 50 14 | 1:°003607 |Biot, Bouvard, Mathieu 
TABLE 
* Mec. Céleste, tome ii. p. 144. 
