DEM 
Semi- -quaver, half a quaver, i in mufic, Demi-femi.quaver, 
a femi quav 
mufic with a black fa, and three 
hooks, or three ties to the tails. 
Demi or femi is half the fubfequent word. 
¥,-in Heraldry, fignifits the half of a 
dod 
Demi, or Dem 
thing ; as, a dem , &e. 
Colombiere has ka he calls croix & demy, a crofs and a 
half; being a o croff.d in the eed aie Hey the Calvary 
crofs, and havi B Put one arm att 
EMI-AIR EMI-V 
OLT, in "Herfmenfi is one of 
the feven attifcial motions of a horfe; eing an air, n which 
his fore-parts are more raifed than j in fe a terra ail the 
motion of the horle’s legs is more quick in the hice than in 
the demi-volt. 
DEMIANKA, in Geography, a river of Ruffia, which | 
4 
runs into the Irtifch, near Demianfkvi. 
DEMI ANSKOL, a town of Roffia, in the government 
of Tobolfk, aciniae at the conflux of the Demranka and 
8 N.N.E. of Tobolfk. N. lat. 59° 35’ 
E. long. 69° a 
Demt-Bastion, fhould literally imply ‘ half a baftion,” 
but fuch would be a very weak defence, on account of the 
extreme acutenefs of the angle prefented exteriorly at the 
point of divifion ; which would, if mathematically done, be 
effeCted by a line drawn from the centre of the polygon to 
the flanked angle, along the capital of the baftion. To 
medy this, the gorge is extended fo as rather to exceed, than 
to be under, the meafurement of che greateft diameter ; fome 
make the gorge equal to the length of the face, by which 
eans the ace, or capital, becomes an acute, inftead of 
an cbtufe gle therewi 
Demi ns are chi fo und i in horn- works. and crown- 
works, 
and in 
eae r fronts, with redans, an 
A ee where they break off from the defence of land 
fides, to the defence of rivers, &c. By this means the in- 
land fences are preferved in fyftematic eee: ; while due 
advantage is taken of the form or height of a bank, &c. 
See ee RTIFICATION, 
mi Cannon, a piece of ordnance, ufually about fix 
acne: bore, 5400 pounds weight, ten or eleven feet long, 
and carrying a fhot of 30 or 32 pound w 
It carries a blank 150 paces ; its cise of powder is 
4 pound w 
. There are ito two fizes of demi-cannon above this, sti 
are fomething larger; as, the ordinary demi-cannon, whic 
is fix inches bore, twelve feet long, weighing 5600 ley ; 
its charge of powder 17 pounds 8 ounces; it carries a fhot 
fix inches and a half diameter, whofe weight is 32 pounds : 
this piece fhoots point-blank 162 paces. 
emi-cannon cf the largeft fize, is 6 inches $ bore, twelve 
feet long, 6ooo pounds weight ; its charge is 8 pounds of 
powder, and it carries 180 paces. See Cannon, aod Orp- 
NANCE. 
Demt-Cross, an inftrument ufed by the Dutch to take 
the fun’s altitude, or that of a ftar, at fea; but inftead of 
which we ufe the crofs-ftaff or forestall. See Plate V. 
Afironomy, jig: 
Dre tke 
46. 
e ttatt, A G, is depron eafily, oe only a line of 
whole tangents, whofe radius is E B, the length of the 
crofs-piece, or tranfom. "Tt 
vane, as A; a figh 
en the va 
the fun’s pane ae : re) 
as upright as you ooking onan the fight vane, 
as H, look for fe hexison at the flit in the horizon 
DEM 
vane, and then flide the crofs-piece or tranfom to and fro, 
till you make the fhade of the vane at E to fall at the fame 
time upon the flit of the horizon vane, and alfo at A; then 
are the degrees cut on the ftaff, by the edge of the crofs- 
piece, the {un’s altitude required. But to take the height 
. a ftar, you muft remove the horizon vane, A, and put it 
n the end G, and transfer the fight vane H to A; then 
holding up the inftrument as before, looking through the 
fight vane, fee for the horizon through the” horizon vane, 
and for the flar by the fhade vane, fliding the tranfom to and 
fro, till the horizon and ftar are both feen by their refpective 
= 
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0g 
f<¥) 
ion 
fo) 
i=] 
ct 
_ 
0g 
a 
ct 
co] 
ta 
et 
a 
re) 
oe 
eo & 
aol 
ao 
oO 
for your pelgne above the level of the water, as muft be don 
in all fuch c 
SULVERIN, 18 a piece of ordnance commenly 4% 
pounds 11 ounces, and fhoots point-bla nk 175 p 
Demi-culverin of the leaft fize, is 42 inches bee ten feet 
long, 2000 pounds weight ; it carries a ball of 4 inches di- 
ameter, its ae is 6 pounds 4 ounces of powder, and its 
level range is 17 
Demi-culverin PF the Jargeft fort, i is 4 inches § sada ten 
feet long ; - charge of ee is 8 pounds and Bo ces 5 
the ball is 45 ighs 12 pounds II ounces ; 
and the point-blank fhoots 17 78 ce, See Cannon and 
ORDNANCE. 
Demi-Dirtong, in Mufic, is uled by fome for a third 
minor. 
EmI Gops, in Mythology, thofe fabulous beings that 
were {uppofed to be produced by the connexion of gods with 
women, or of goddeffes aie men; 0 
diam 
religion. ee 
EOGONY 
the battions gt appertain to 
thofe 2 inn refpedtively, lee be unequal in dal to the 
o fides, an e will be - 
divided | into two unequal ee es its a“ - 
ina right line from the flanked angle to the 
rive Ww 
centres, the capital of each demisbation will lead toa pair . 
Oint, ¢. ¢.the centre of its own derivation, and there will be 
found a {pace between the two pels exclufive ae two un- 
se demi-gorges. 
as the centre of the gorge, and to fuppofe the demi-gorges 
to meet at that point. See es 
i See Harguesuss. 
mi-Lune, is a defence nfually attached exteriorly to - 
the a vi of a raveline: 
crefcent fo orm, W 
sine | is now generally called the ca it isin pool le, 
but is always ae _ a flanked angle, and not circular. . 
See FortiFicati 
DouOdnea in \Gergraply, a river, {wamp, and lake, = 
the 
