FREEZING, 
+ Mixtures. " ‘Thermometer finks 
Sulphate of: fo : 5 parts ror ° 
Diluted falphorie acid 4 7 2 50° f9 3° 
Sno - - I Part, eae o 
eines falt - 1 i From 3? es 
Muriate of lime - 3 parts Gea Be aac ae 
Snow - : - 2 3 
Potah - = - 4 parts t From 32° to — 51°, 
- - o 3 ° 
Snow .- .  -- = 4 pat 2 a. Sta — bo” 
Diluted fulphuric acid I S pr OMe=i20 SOE 80% 
Snow or pa ice - 2 parts Sree ee. 
Coon n fale a i From 0° to — 5% 
Sno - 3 parts ° 5 
Diluted nitric acd - 2 i oe koa: 
eciania e me : : parts t Fiom:.6° to: 667. 
Snow or pounded ice = .1 part. 
ie ane Pron — 5°to — 18° 
Muriate of ammonia and 3 ° 
Sno 2 parts 
Diluted fulphuric acid I From — 10° to. — 56°. 
Diluted nitric acid I 
’ Snow or a ice - ¥F2 parts : ; 
Common falt ‘From — 18°to — 25°. 
Nitrate of ammonia - 5 , 
Muriate of lime - 3 parts _ 6 
oe 7 oe i From — 40° to — 73°. 
. _s fulphuric acid From — 68°to — 91°. 
To parts. 
8 
For more echianal in regerd ¢ - the hiftory of the con- 
gelation. of mercury, fe 
A little oe will ney i of the precautions 
gs in thefe mixtures. falts 
n important part of ae pec 
is therefore needful that falts liable to cffervet? 
the 
m ey a er deliquefcent falts, fhould be cryf. 
tallized, then eT paff ough a fieve, and bottle 
€ oo to prevent 3 of air. Ie ker forms 
for that yale ; but for e re- 
commends ng t e liquid oan to 1.49 {pecific Saul at 
the mean of 80°, cryftallizing, Narra casi ing’, 
The veffels containing the frigo res thon Id 
be thin,’ and juit large enough to hold en, Tinned iron 
will do well where no acids areemployed. The a pergs 
fhould be mixed as quickly as poflible. hen great cold i 
to-be produced, the ingr redients are to be feparately cooled 
in: spel snag onal ; thus ie may be reduced:to. 0 
by a ure of fnow a aid common falt.. The eee 
- ed on thefe Pan ae are made of fpirit of wine or al- 
ga 
“The- ee in the above table -is cauttic i sa rf. 
by Mr. Carat for aan 
tallized ; and the diluted acids are the common acids of the 
ops dilute d- with equal * ‘weights water. 
oo that Mr. Walker fas us the {pe- 
s their ftrengths 
iable. 
ammoniac, in the proper proportion of water, are fourd 
moft a sivantapecis: as the falts are any recovered: by eva-- 
por ration De. 
nae. 
t temperature, we ine an. 
elevation af Ble eats la and water mi 
ntly too 
Dalt ton be confirmed, that the fi 
39° or — 40° ofo ,at 72 below 
fr — point of water, be really 200° below ns faid point,, 
en the degrees.are duly apprecia ie, markable cir— 
See of lefs cold than heat being panne: from che-- 
mmical mix = res, will vanifh. 
FREEZ G Apparatus, is a very {mall apparatus seeped 
corn quantity: of wate 
about 10 grains, in ev gts an The who ceppenee is 
contained na box 4% es ee 2 inches broad, an ie 
deep.. ‘I'he apparatus, and method of uling it, are i efented 
in Plate XIV. Pneumatics, is a common phial. 
with a glafs ftopple, filled w “ith ‘ether; ; EDis a 1 glafs tube’ 
with a capillary aperture at D fome thread’ 
woun 
the neck of the b 
formed. A Bisa glafs tube about four nee long, and cue 
ith of an inch in diameter, hermetically clofed at B. Into. 
this tube a flender w ire His introduced, de lower extremity- 
of which is fhaped into a fpiral, and ferve es to draw. out the. 
ice when formed. Whena little water, CB, is put into the 
tube, the operator holds the tube by its. upper part, the 
fae of the fe peg cand pee it eee gre but 
ing 3 round. it » firft o 
the flream of et oe sect ta comes ee of the: 
vepillary a aperture D, towards the outfide of the tube, a lit-. 
tle above the furface of the water oe iin. eeu ftream as 
out of the t 
done, the phial is turned with its aperture upw 
tube ED is removed, the ftopple is. see in its ftead,, 
and Raabe ether i is fica ved for other late 
EREEZING Dy ang Ecey isa very. uncommon kin 
of. fhower,. eich fell in ie weft of ia in December, 
anno 1672. Sce Phil.:'T'ranf. ae 
'. This rain, as.foon.as-it touc y.thin ng above ground,, 
‘as.a bough, or, the like, immediately { fettled into ice ; 
cad ae and. -enlargin . 
with- its. weight? The on- the fnow ime. 
ee ‘fue into ice; without: oe in’ the faow at. 
all. 
Tt dienes ace ile deftraétion of t trees, beyond any ‘thing: 
ia. 
