CO K 
other regifters in the chimney-flues, to damp or check 
the heat, and detain it more or lei's in its circulation 
round the feveral baking-ovens refpectiveiy. The ba¬ 
king-ovens may alfo be heated by the admiflion of the 
flame from the coke-oven into them, through a large 
opening, for as long time as may be neceflary to give the 
proper hear". The mouth may, at the fame time, be 
doled, ami only a fmaller opening or flue left, fufiicient 
to carry off the flame, and to keep the body of the oven 
full, as in reverberating furnaces. Thole fmail openings 
may alfo be governed by regifters ; it ihould, however, be 
obferved, not to admit the flame till the fire in the coke- 
oven is become clear ; the laid opening from the coke- 
oven being afterwards clofed by a regiiter, the heat will 
then remain equal, or diminilh gradually, as in the com¬ 
mon way of heating ovens by faggots; and in this man¬ 
ner two, or more, baking-ovens may be heated alternately 
from the lame coke-oven, and the procefs continually re¬ 
peated. When metals are to be calcined., qr melted, a 
turn :ce adapted to thofe purpofes is placed contiguous to 
the coke-oven, whence the flame Ihould be conveyed im¬ 
mediately through large openings, and in as fuli a body 
as.may be, with this caution, that, in melting, the fire 
iliould not be (utiered to pals into the furnace (being 
fliut eft’ by regifters) till the fulphur and fmoke of the 
coals is palled oft’, and the flame appears bright and 
clear; in aii cafes the chimney ihould be raifed to a con- 
fiderable height, as ot thirty or forty feet, or more, as is 
common for furnaces, in order to command a quick 
draught, which may be conftantly reftrained by the regil- 
ters, as above deferibed. This invention has the pecu¬ 
liar property and advantage, that the fame oven may, at 
the fame time, be applied to feveral different purpoles ; 
or that two, or more, coke-ovens may be io placed as to 
be applicable to one and the fame purpofe, as in the cafe 
of fleam-engines, or of fome metallic procelies, where a 
great force ot fire is required : and, in fleam-engines, the 
fleam may be acquired either from two, or more, different 
boilers, or the heat from the different ccke-ovens applied 
to Angle boilers of an extraordinary dimenfion ; and at 
all fuel) forges where the price of coal is any way confi- 
derable, and the demand of coke great, this method 
ieems to offer the higheft advantages. Another particu¬ 
lar in theie conftrudlicns, of Angular advantage in many 
cafes, is the readinefs with which, they may be made to 
turn off the fire, and to cool; for, in thofe, not only 
double regifters may be ufed immediately to fliut off the 
flame, but alfo air-holes placed between thofe regifters, 
to be opened like them at pleafnre, as well as'other air¬ 
holes alio, to open between the crown of the coke-oven 
and bottom of the boiler, or into the circular flues, if 
defired ; which will prodigioufly quicken the cooling,, 
and which, being afterwards ftopt with bricks or plugs, 
well adapted and luted where neceflary, will render the 
alternate admiflion and exclulion of the air complete; 
and will have the farther advantage of making openings 
to clear the different flues occafionally. When the pur- 
pole to be lerved is that of warming houles, or ftaircafes, 
the oven may either be placed in fome convenient fpot 
joining to the v/all of the lioufe, and the flame or heat 
drawn from it into flues within, properly difpoled to re¬ 
ceive and condudt it; or the body of the oven may be 
placed within the houle, covered as ftoves often are, in 
?uch manner for convenience or appearance as may be 
thought belt; which may be the moie eafily done, as coke- 
ovens of a moderate, or even final], lize are found to give 
heat fo as to produce very confirferable effefts. .The heat 
or flame, being condu&ed through the flues, as before 
mentioned, to the places to be warmed or heated, may 
be ufed for different domeftic or other purpofes. An 
oven of this kind, of no more than three feet diameter, 
and one foot and a half in the height, or little more, hav¬ 
ing been experienced to keep a boiler, containing feven- 
ty-two gallons of water, conftantly boiling, fo as to eva¬ 
porate nine gallons per hour, and to work, at the fame 
Von. IV. No. 236. 
COL 761 
time, a fmail flill; and fometimes to calcine, or melt, 
both copper anu iron. It may be ufeful to mention, that 
regifters much expoled to the immediate heat of the fire 
Ihould be made of the beft Stourbridge, or other ftrong 
loam, or brick-earth, or of a compofition of fuch loam 
and old burnt ware from gla'fs-houfes, &c. pounded, or 
other like compofition ; in other parts they may be con¬ 
veniently made of iron, of different thicknefs, according 
to the different diftances from the,fire. It has alfo been 
found ufeful, where the heat is very great, to have the 
iron handles, uled for drawing the loam or compofition 
regifters, fo fixed, by hold-falls in holes made in the re¬ 
gifters for that purpofe, that no part may be-expoled to 
the great impulfe of the fire, but defended by the b,rick- 
work. It may alio be found ufeful, where the regifters. 
are of extraordinary fize, to make them a little of a wedge 
form, narrowing towards the end, in order to their draw¬ 
ing or lifting with eafe; the grooves in which they run 
being made in the fame form, fo as to fliut well when, 
clofed. 
CO'KF.NHAUSEM, a ftrong town of Livonia in Swe¬ 
den, on the river Divina. 
CG'KER, a river of England, in the county of Lancas¬ 
ter, which runs into the JLnlh fea : five miles north-weft of 
Gurftang. 
CO-KIANG, a town of China, of the third rank, in 
the province of Se-tchuen : twenty miles eaft-fouth-eaft. 
of Tche-li-leou. 
CO KING, a city, of China, of the firft rank, in the 
province cf Yun-nan : 1160 miles fouth-fouth-weft of 
Pekin. Lat. 26. 35. N. Ion. 117. 42. E. Ferro. 
COK'ZIM, fee Choczim. 
COL, one of the weftern iflands of Scotland, about 
thirteen miles long, and three broad. Col, in the lan¬ 
guage of Dr Jphnfon, is not properly rocky, but rather 
one continued rock, of a furface much diverfified with 
protuberances, and covered with a thin layer of earth, 
which is often broken, and difcovers the ftone. Such a 
foil is not for plants that ftrike deep roots; and, perhaps, 
in the whole illand nothing has ever yet grown to the 
height of a table. The uncultivated parts are clothed 
with heath, among which induftry has interfperfed fpots 
of grals and com ; but no attempt has yet been made to 
raile a tree. The lord has lately introduced the culture 
ot turnips, to provide food for his cattle in the- winter. 
Col has many lochs, fome of which have trouts and eeis. 
Their quadrupeds are horfes, cows, (beep, and goats. 
They have neither deer, hares, nor rabbits. They have 
no vermin, except rats, which have been lately brought 
thither by fea ; and are free from ferpents, frogs, and 
toads. The number of inhabitants rather more than 800 ; 
eleven miles north-weft from the ifland of Mull. Lat. 5 6. 
38. N. Ion. 3. 30. W. Edinburgh. 
COL of AKEZ, a palfage of the Pyrenees, in the road 
from Prats de Molo in France, to Campredon in Spain. 
COL of ARGENTIERE, a palfage of the Alps, be¬ 
tween Nice and Saluzzo. 
COL of LIMON, a palfage of the Alps, between Sof- 
peila and Coni. 
COL of PARACOLS, a palfage cf the Pyrenees, be¬ 
tween Ceret in France, and Ampurdan in Spain. 
COL of PERTUS, a paflage of the Pyrenees, between 
Boulou and Junquere. 
COL of TENDA, a palfage of the Alps, between Pied¬ 
mont and Nice, over the mountains of Tenda.. 
COLAIRCOT'.TA, a town of Hindooftan, in the cir- - 
car of Ellore : ten miles eaft of'Ellore.. 
CO'LAN, a town of South America, in Peru, and ju- 
rifdiftion of Piura. The inhabitants raife a great deal of 
grain, and feed a number of cattle., which they riifpofe of 
to Payta and other towns:, three leagues north of rayta. 
CO'LANDER, f. [from cob., Lat. to ft rain.-] A lieve, 
either of hair, twigs, or me al, through which a mixture 
to be feparated is poured, and which retains the thicker 
parts; a drainer.—Ad the vifeera of the body are bt.t as 
2 H I<> 
