DEC 
phere can move from eat to w ot while that in the northern 
hemi{phere moves from weft to seen not. But 
aa matter a ie eattentiviy. In 
e, it cue be obferved Ken in aie of the dee 
fer to the nor 
north end 0 £ the needle ae to the welt of the meridian, 
we fay it has fu many ¢ ion, though th 
fouth end thereof points as many d legrees 
Again, when'the north end of the needle points to the ealt~ 
ee of the meridia 2 we fay it has ealt alia thsunn 
to ig panies 
S 
5 
5 
2 
ve to the eaft 
ay, the needle to have weft variation; and 
the weftward, it makes what 
5 therefore is the canfe; on ac- 
fclination, or Halleyan 
a contrary motion in the fouthern hemifphere to what they 
have in the northern ; though both the magnetie poles of 
a earth move in hie ge direction, that is, from weft to 
——__—_—— * It is alfo curious to obfer rve, that o 
cei of the fouthern hemilphere being 
whoie than the northern he 
would have moved with unequal 
m2 agnet’ ¢ pole would have moved farther in any given time 
to the north-eaft, than the fouth magnetic pole.could have 
moved to the fouth-eaft. And, according to the opinions 
of the moft ingenious authors on this fubjec, it is generally 
allowed, that at this time the nerth magne etic pole is confi- 
derably nearer to the north pole of the earth, than the 
- fouth magnetic pole is to the ea pole of the earth.” 
ECLINATION ofa vertical ea or wall, in Dialling, is an 
arc of the horizon, eben a eithe 
aad the eis vertical cir 
well ; etween the osidian ad the plane, if you ieecoun 
it ou noe to fou 
ere are many wayd g given by authors for finding the 
declination of planes: the mot praCticable way is by a de 
clinator. 
.- DECLINATOR, or Decuinarory, an inftrument in 
dialling, whereby the declination, inclination, and reclina- 
tion of planes is determined, 
i ructure is as follows: a {quare wooden ean 
ABCD (Plate I. Dialling, fe 1.) deferibe a femicircle 
A ED, and divide the two quadrants thereof AE and El 
in o degrees each, beginning from E, as in the § Agure. 
Then, having fixed a pin in the centre F, fit a wocden ruler 
I on the fame, mov = thereon, with a box and 
epaly (ete oe 
8 MN (jig. 2.)5 
“a G, this way and that, about vibe centie F, a the eae 
reft upon the line of the magnetical meridian of the place 
Now, if the ruler in this Gtuation cut the quadrant in Es ne 
plane is either northern or fouthern ; but if it cut between 
Dand E, the plane declines to the welt, or if between A 
aad E, i oS eaft by the quantity of the angle GFE. 
The rument wil -_ ferve to ‘ae the inclina- 
tions ao Goat as of pla d : 
and ne 
or 
: the ce 
B » bei pplied to the p plane, as +e 
ffs. 3- 7 if the lune: line F G cut ie Promiclele AED 
DEG 
the point E, the plane is horizontal : 
or if it cut the a 
4 D in any point at ee the ang e 6F 
inclination: laftly, if eye the fide AB . ue nen 
the plumbet cut E, the plane is vertical. Hence, if the 
quantity of the augle of inclination be compared with the 
elevation of the pole, and equator, it isealtiy known whether 
. plane be inclined cr_reclined. .See IncuinatTion and 
CLINATIC 
DECLINATORY Piz, in paca See Benefit 
CLERGY 
DECLINATUS, Cavutis, a de clining ftem, in Botany, 
exprefies a ftem bowed arch-wife towar ds the ea arth, as tf 
the bramble, Rubus frrdico/fis, and flit! more remarkably it 
the Ficus ng whofe declining branches, taking root, mak 
a whole grove wee tree. The term is “fynonymous 
with reclinatus, ack lait is moft generally, though perhaps 
lefs p se ufed by Linneus. 
DECL Jin Mediciue, a popular term applied to almoft 
all chronic ee , in which the itrength and plumpnefs of 
— ody gradua ally decline or decreale, until one alae 
re term is fynonym s TION, 
Cuhich fee,) and is more petty aapliee to ee es 
tion . hie hoe, = of the me a 
DE ERS, or Dzc G dials, are thofe which. 
cut ae the plane of the ane oad circie, or the plans 
of the horizon, obliquely. 
If we conceive the plane of the prime vertical circle to 
revolve a little npon aright line drawn from zenith to nadir, 
re) 
ike manner an v horizontal oo will Le joie to decline, 
if revolving on the meridian e par e raife 
a little hs the pa wd — thet deprefled towards 
cae nadir. 
he ufe of declining vertical dials is very frequent, be« 
caufe the walls of houfes whereon dials are commonly drawn, 
do generally decline from the ain points. Incliners and 
recliners, and efpecially deincliners, are very rare. See 
Dia. 
DECLIVITY. See Accriviry. 
DECLIVITIES or Mounrains. On this fubjeét a 
number of writers have remarked, that the weltern fides of 
mountains are lefs fteep and abrupt than their eaftern 
arfe from is pe rife-of the m t 
toward t the ending o aa toward 
the welt, which on the hill or Coda, cif- 
located parts of a 
tous fides i 
al 
fmall, are general iy occafior 
of ftrata, one fide is generally much a ee fone ade op- 
ery common and 
sacha Pan ufeful vey of “eatredling ie ‘foluble and efficacious 
wocds, and roots, 
XC the fo 
to a pint of Tate a ere half o ora gauche: of an 
ounce is fu 
fee. aes us from his own oe Solaeaae that a 
iitoa of v , 
ca are a ad evaporated by a boiling heat. 
Li m 
