GAS aes cal 
by a cylindric veffel d, open at bottom, but 
partially immer — beneath the furface of the water contained 
in the e€ garometen, and perforated round, near 
dge, with a num {mall holes. The gas dif- 
places the water fro receiver d, and efcapes oe 
the {mall holes lee in “bubbles through the water, fo as t 
expofea large furface to its a tit may be wathed 
and purified from any {mell. Ape *ifing through the water, 
the gas enters the gazometer H H, which is fufpended to 
move u up and down by the chains and pulley ee, and balance 
weights f, f- In the centre of the gazometer a tube g is fixed, 
aving fome {mall holes at its upper end, by which it com- 
municates with the interior of the gazometer. ‘This tube in- 
an 1 ot hers 4, which Coney 
the gas to the burners. The fixe Fie h form ee 
rs perpendicular ; aad ae pipe in the 
san 
int e centre W hole. 
he gazometer a ri pained aes and w Hien to pre- 
ferve it from rufting. r. Clegg fays, a veflel of this kind, 
to contain ze © cubic feet of Ba, heey ee about 20 cw 
When the operation comm gazometer is fun 
down nearly to a level with ie "furbice a the water in the 
ciftern LL; but as the gas enters, it rifee up to receive it, 
It is to be noted, that the balance weights f, f, fhould not be 
quite fo heavy as the gazometer, in order that fome preflure 
may be exerted, to force the gas out of the burners with a 
Pr oper jet. “The gas which iffues from the retort enters the re- 
ceiver G, afcen 
moe 
and raifing it up: the gas then pa way to the burners. 
n this manner the procefs a me the whole of the 
ae produts of the coals he retort i po 
The ufe of the gazometer is, to equalize the emiffion of the 
gas whichcomes from the retort more quickly at fome time 
others. When this happens, the veffel rifes up to receive 
t, and when the ftream from the retort diminifhes, the 
weight of the gazometer expels its contents. When the pro- 
cefs is finifhed, the retort is fuffered to cool, and its lid is 
moft excellent coak, and 
in value cine a confiderable portion of the whole expence 
of fuel when the retort cools. The veffel d contains a fuffi- 
cient quantity of ‘gas to o fupply any ed dir which takes 
place without raifing the water into the 
r. Clegg’s original eae fa chains we ie spe 
weight are attached to the top of the gaz d the 
ciftern L, for containing the water of the nee! is ee 
fented as a well funk in the ground. This method is cheap 
and fimple, though at the fame time it is liable to have leaks, 
which are not eafily difcovered or acceffible to be ftopped ; 
and it paiaees confiderable length of pip2s to draw off the 
matter from the rec 
ae ar in the plate, they are drawn off by the cock at #. 
Of rian products we ak more in another plac 
s.2and 3 toile one of the gas lamps on ie principle 
of Agand; the fpace between the two Sue tubes % 
_ is fupplied with gas by a pipe, c, in which is a coc 
— or Sean, intercept tl, gas. The {pace between 
AV. 
ee 
eiver G ; whereas in the conftruction re- 
of air is aes sree = internal tube d.- The air has 
alfo paflage beneath the glafs chimney, f, to fupply the out 
fide of the flame, which 1s rendered the moft fteady and re» 
He imaginable, by the draught caufed by the chimney : 
a {m all vans affixe 
its pofition. utton conveys a current of air rifing 
through the tube in an expanded cone to ie infide of the 
flame, and affiits the combuftion in a great degree. 
e next apparatus for gas lights which we as de- 
{cribe is by Dr. Stancliffe, as fhewn in vef- 
fel of caft-iron, forming the retort, andj 1s fet in geen ork 
in any pseper fur oe e; Eisa rim caft in the pasta piece, 
inclofing the top of the former, fo as to make a d 
all round in the top of the hie 
“, of the veffel is received ; 
by the heat of fire, ~ forms a fi 
which prevents the ao the i 
oa 
ne above the other; the tube G goes down nearly to 
the bottom of the loweft divifion, and the gas bubbles up 
from the end of it through the water, with which the 
lower partition is partly filled: it then paffes out at the. 
pipe, a to wa burners. Thhefe muft not be of fuch a num- 
en the gas co 
tort, it prefles upon the aioe of the eae and. ¢ 
it to afcend through the pipe, e, in artition into ‘the 
upper chamber, where its w aes conftantly acts to caufe a 
preffure, and expel the gas at the pipé, d, whenever the ~ 
{upply of the retort diminifhes ; f is another pipe through ° 
the partition to allow the efcape of the gas, if it forces a 
the water fo low as the bottom of the pipe: the gas which 
then rifes en the upper divifion ae away by the pipe g 
into the c of the funnel. tancliffe has recently 
taken out a ne for the method of luting of the head 
a a at G, as ape to the diftillation of any other 
“Fir ig. 5. is an etuedate by Mr. B. Cooke . a ogee 
eee communicated by him to the Society of Arts, and 
rewarded by tea with a filver medal. The pipe A leads 
the gas on the pot or retort,.and is fitted, ina manner fimi- 
lar to Dr. Stancliffe’s, to a veflel B B, called the purifier. 
This is filled half full of water, and has. five partitions, 
condenting and depofiting in the - bot fo) 
tar and ammoniacal liquor, which can a drawn of "y t basi 
4R : 
