OBL 
it, and the rhode . oe it without unequal prefflure on 
each - of the cen 
m what has sleeady been rig aga it neceffarily fol- 
lows ne each impoft of the arch, in plac of being fimply 
The cafual 1 tiles of thefe arches is obvious, and = 
theoretic and practical mode of forming them has been ex- 
plained to fuch extent, as to make the procefs soe to ae 
intelligent mafon. Since beta 
the peri ave 
the plan has in a few inftances been followed ; ~ ie fam 
idea af have occurred to others, although we have never 
hear 
The sthacipal ufe of fie bridges will be where lines of 
projected canals interfe€t high roads with obliquity; in 
which cafe, the road, if curved for a fufficient extent to fall 
Under this predicament, Pies 
houfes ~ to interr 
often un i 
the ee acquired by it. 
the preceding article to — Chapma 
ingenious = to whom we ae ay sper ere jae 
the ae 
Osi 
a Cre, 3 in the ftereographical projeétion of the 
hed pies circle that is oblique to the plane 
of pro- 
Osu us Leaf, in Botany, is fo twifted, that one part 
become panied while the other is horizontal. The term 
obliquai is fometimes, lefs correftly, applied to a leaf un- 
equal at the bafe, or fides, as in Begonia and Eucalyptus ; in 
both which it was unfortunately chofen for a pas name, 
being afterwards neceffarily changed, whep the character 
proved common to almoft every fpecies of thofe now nu- 
merous gen 
Os ee ‘Line, a line which, falling on another, makes an 
one ue angle. 
A line falling obliquely on — re the angle on one 
fide obtufe, and that on the other 
Oxrique Percuffion, is that Shera the direétion of the ’ 
ftriking body is not perpendicular to the body ftruck, or is not 
in a line with its centre of gravity. See nN. 
pendicular one, 
is etna to be as the fine of the a of incidence to 
the radi 
Gicee Planes, in Dialling, are “= as recHne from the 
zenith, or fel towards the hori 
e obliquity, or quantity of dae oe or reclina- 
tion, is bey found by a quadrant ; 1t being an of fome 
azimuth, ot vertical Gale intercepted pees, he vertex 
of the place and of that plane. ‘This azimuth, or peieen cir- 
ele, is always perpeniic dt to the plane 
OBLIQUE Powers or Forces. See Morton, Dace, 
E Projection 
is impelled in aline of dire&ti 
gle with the horizontal line. 
in, th Mechanics, is that where a body 
on, which make an oblique an- 
See Prosectrion. 
OBL 
Os iiqut Sailing, in Navigation, is when the fhip, being 
in fome intermediate rhumb between the four cardinal points, 
makes an oblique angle with ny meridian, and continually 
changes both its latitude and longitude. 
Oblique failing is of three kinds ; viz. plain failings Mer- 
cator’s Sai ing, and great circle failing. See Sal 
amen alfo call the application of i “aati of 
calculating the ae of oblique plain triangles, in order to 
d the diftance of a fhip from any cape, head-land, &c. by 
ne name — oblique failin 
= 
and vights 
Thofe who live under an obliqne {phere (as we, and all 
thofe in the temperate ie > never have their days and 
ts Ray in the equin 
QuE Afcenfion, in Arowony a ASCENSION. 
— Defcenfion. See DeEscensi 
To find the oblique Pate and defeenfion by the globe, 
a 
oe 
uz Cafe es, in Grammar, are all the cafes i the de- 
cleo oe nouns, befides the nominative. See 
que D: illery, 3 in Chemifiry. See Sas oe. 
Oats Flanks, in Fortification. See FLANK. 
OBLIQUITY, that which denotes a thing oblique 
The obliquity of the {phere is the caufe of the inequality 
of the feafons of nights and days. 
OBLIQUITY o . ar is the angle which the ecliptic 
makes with the e 
OBLIOQUO, . fie, Tealian Mufie, fignifies two ess tied 
which make but one body, whence it is named in 
talian nota d’un corpo folo ; fometimes there is a tail, on the 
right or left fide, either afcending or defcending. (See Nore 
and Licature.) However it be, the two extremes mark 
the found, the middle ferves only to tie them, thus 
Zz 
‘ os 
OBLIQUUS, in meee an epithet applied to feveral 
mufcles of the hum 
oer and eae be well underftood, when defcribed in 
an infulated way, we fhall give an account of the whole in 
this article. 
The fides or parietes of the abdominal cavity are compofed 
( Ti 6 
ii Hie are formed by the abdominal multe properly fo 
called, which fil up all the fpace between the inferior 
aperture ve the che it and the fuperior cien of the pelvis. 
The contractions of thefe mufcles change the dimenfions and 
form of the a move the vifcera1 : erat erlang 
e 
