OSC 
the motion of the pendulum, is determined in every thing 
that concurs to the ids thereof: fo that it can only 
ata one certain e 
agitative foie of the pendulum leas from three 
et 1, The power or momentum of gra 2. The 
ma{s or body tied to the end of the inflexible ei 3. The 
diftance. of that body from the point of fufpenfion, or, 
which is the fame, the length of the rod, or the pendulum. 
. The power of gravity, be the caufe what it will, 
is that power, Mie makes a body fall, and that, wv. gr. at 
the rate of 14,3, Paris feet in the firft fecond of time. It 
is -vifible, then, that this force is the effect of a quantity, 
which determines thofe 15,3, feet, and that a heavy body 
would pafs more or lefs {pace in the fame firft fecond, if de 
force o eae were dl aed or lefs, 
2. at force is inherent each point, or —_, 
{mall act of a bo ns the greater the body is, or the 
larger its mafs, the greater quantity of motion or force i it 
nd, the Ja 
aa 
w, the agitative aie of the ar is only that 
end as the 
But if it be fappoled, , pee ee are, in nature, different 
n be poflible, that two fimple 
» fhou Id be ecules the 
ginary one. 
If the imaginary gravity or weight be greater than - 
natura! one, the pendulum, imagined ifochronal to the 
tural one, will neceflarily defcribe a larger {pace or arc in 
neceflary proportion. 
s the {pace or arc defcribed by the 1 cag acy 
is greater than that by the natural pendulu the fam 
ratio as the imaginary gravity is greater than “ aed one, 
anda radius of that arc greater in the fame ratio, are two 
things infeparable ; the two gravities will be always to one 
another, as thofe two radii, or the two lengths of the two 
e be und pendulum, charged with 
two pooh ¢ or balls fattened to the fame rod, M. Ber- 
OSE 
nouilli conceives each of thofe weights removed to a greater: 
diftance from the point of fufpenfion than it was before ; but 
both to the fame; and dim 
ishad, and ifochronal to the natural compound pendulum. 
Thus, we fhall have one fimple natural pendulum ifo- 
chronal to compound natural one, by having a fimple 
natural pendulum ifochronal to the fimple imaginary pen- 
dulum before found ; which is very éafy : fince, as the ima- 
ginary gravity is to the natural, fo i is the length of the fim- 
ple imaginary pendulum to the length of the fimple natural 
pendulum ; and it is there the centre of ofcillation is re- 
ire 
i We fhould here ie notice aes Mr. Taylor, a celebrated 
mathematician of o wn country, difcovered about the 
wi ohn Bernouill, a fimilar folution of 
sa aad ppublithe d it in his ** Methodus Incre- 
tor See Perpu.un 
tre of. See CENTER of Ofcillation. 
O » among the Romans, an appellation given to 
fuch birds, from whofe pees or notes, omens and pre- 
diGtichs were drawn. LITES. 
OSCITATION, ae es popularly called yawning. 
OSCULA, in seca a term ufed for the orifices, or 
openings of the larger ve 
OSCULATION, in Geomelty, is ufed for the conta& 
between any Biven curve and its ofculatory circle ; that is, the 
circle _ ame curvature with the given curve. See 
URVA 
OSCULATO RY, in Church Hiflory, a tablet, or board, 
with the picture of Chritt, or the | bletied Virgin, or fome other 
of the faints, which,a 
eucharift, the prieft firft kiffed himfelf, and then delivered to 
the people for the fame purpofe. 
SCULATORY Circle, in Geometry, is ufed chiefly by 
oreign mathematicians, for the circle of curvature; that 
is, the circle having the fame oo with any curve at 
any given point. See Curva 
Oscutarory Parabola See PARABOLA. 
OscuLatTory Point, the point of conta between a curve 
and its ofculatory circle. URVA 
OSCU » in “Analytical Geometry. a CuRVATURE 
and EvoLure. 
scuLuM Pacis. Anciently it was a cuftom in the church, 
that, in i: scorer of a after the a had confe- 
crated the water, and {po the words, omint Vo~ 
ta the people kiffed rh other ; cae was called o/- 
culum ieee 
When this cuftom was abrogated, ancther arofe; and, 
while ie an {poke the words, a deacon, or fubdeacon, 
pes iy the people an image to kifs ; which they called 
“OSEMANPOUR, in Geography, a town of Bengal; 20 
miles E. of Burdwan. N. lat. 23° 11'. E. long. 88° 2 
N, a town of uit in the diocefe of Oe 
theim ; 56 miles N. of Drentheim 
OSE ENOKA, a river of Rafa, which runs into the Ko- 
lima, N. lat. 64° 15’. E. long. 148° 14). 
» ariver of Ruffia, which runs into the Oka, 20 
miles N.N.W. of Riazar. 
OSERO, an ifland in the Adriatic, iow the coatt of Dal. 
matia, feparated by a narrow ftrait from the S 
nd of C 
ifland of Cherfo ; about 15 miles long, and from. tw 
n 
ftagnate for want of an outlet, a become putrid. Their 
city, 
