‘the ule of lime, barytes, or 
Mr. Teunant’s New Patent. 
‘From tlie liquor remaining after the 
mBHéepiation of the brick- coloured falt, 
by amimoniacal mhuriate, a brownifh yel- 
ow precipitate is obtained by the ‘ad- 
dition of pot-afh: ‘This being fep: arated 
by the filter, and mixed with nitric aeid, 
in the proportion of half an ounce of ai 
to one drachm of tlie precipitate, igi 
a glutinous mafs of a yellow colour, 
afterwards afluming the green hue of 
chrylolite. This jell y expofed to the 
blowpipe is converted into a black mat- 
ter, which is probably platina in a ftate 
of femi-oxidation. 
Urine, both frefh and putrid, precipi- 
tates the platina in a faline form, accom- 
panied bya greyifh yellow powder that 
is probably phofphate of iron. 
2. On-the amalgam of platina. 
Toa drachm of the orange coloured falt 
of platina, was added an equal quantity 
of mercury, and the mixture was tritu- 
rated ina glafs mortar. Ina few mi- 
nutes the colour of the falt was changed 
to brown and greenifi brown. 
addition of another drachm of mercury, 
the platina appeared in the form of a 
grey powder; the third drachm of mer- 
“tury began to amalgamate the piatina, 
and whien fix drachms were added, the 
amalgamation was complete: the whole 
” 
On ‘the 
217 
operation taking up fearcely more than 
twenty minutes. 
The, quantity of mercury being t= 
ereaféd to nine times that of the (alt, the 
amaleam fill continued fo tenacious as 
to bear impyeflions of very delicate feals, 
and to extend perfectly well under the 
pettle. Now, as the falt contains only 
40 per ct. of platina, it appears that one 
part of platina is capable of reducin? to 
a firm amalgam 22.5. parts of mercurys 
On covering the furface of the amalgam 
with water, and rubbing it in a mortar 
for the fpace of about ten minutes, the 
whole of it was converted into black pul- 
verulent oxide of mereury, intermixed 
with extremely brilliant particles of pla- 
tina. The fame effeét was produced on 
rubbing it with the:finger ‘in the palm 
of the hand: and from further experi- 
ments, it appeared that moft metallic 
fubftances, and all animal matters decom= 
pofe this amalgam by fimple contact. If 
to the black oxide thus produced, be 
added liquid fulphare of ammonia, it is 
converted, in a hoe hours, to a fubftance 
of a dull red colour, not diftinguifhable 
from cinnabar; 
[The Analyfis of the other curious me- 
moirs in 7if No. of the “* Annales de Chintie,”” 
to be coxicluded in our next. ] 

NEW PATEL SB 
Enralléd in the Mouth of February. 
\N the goth of January letters pa- 
tent were granted to Mr. C. Trn- 
NANT, of Darnley, near AoW for 
ftrontian 
earth, infead of an alkali, in the pre- 
paration of a bleaching liquor from the 
oxygenated marine acid. The diftovery 
which the patentee c claims, is not that the 
/ Acid is capable of combining with thofe 
of applying thein. 
-acid is to be procured from manganefe 
earths as with an alkali ; but in the mode 
In this procefs, the 
in the fame apparatus as has ay here- 
totore uled, but the receiver, which is to 
detain the acid, initead of containing an 
alkaline ley, is to be filled with quick- 
lime, or either of the cther earths, fifted 
fine, and kept inconfant motion by an 
agitator of any kind, {fo long as the acid 
fas comes over. By keeping the lime 
thus con! tantly fulpende ed in the water of 
‘the receiver, it is enabled, to be rapidly 
faturated with the acid gas, in as com- 
plete aimanner as if lime-water had been 
employed; and with the capital advan- 
tage ot prefenting a2 much creater quan- 
tity while only fi pended, than sand 
have been done if it had been diffolved. 
Vase oxy-muriat-of lime thus produced. 
remains in folution, and, after a few 
hours ret, may be drawn off clear from 
the unfaturated part whith remains. at the 
bettom. Dir. T. alfo adds fome common 
falt to the water ‘of the receiver, to give 
it a greater {pecinic g gravity, and thus to 
favour thé fufpe nfion of the earth. 
The proportions. of the ingredients are 
as follow :—whe ere the retort 15 charged 
with 3 30 lbs. ot “tanganefe, arid the fame 
quantity of fea-falt a md Vitrielic acid, the 
receiver may contain 340 gallons of 
water, fo which he adds 30 Ibs. of com- 
‘mon falt, and €0 Ibs. of quick-lime, 
fifted to a fine powder, ‘This fhould be 
firred about as foon as the acid gas be- 
‘gins to come over, and kept in conftant 
. agitation during the whole of the dtitil- 
Idtion. The gz Wor thus produced, my 
be equal in efiect to the faturated alkal}: 
lolution ufually employea, and there w “i 
be a flavins oF ‘the difference of expences 
betrreen the lime and alkali.’ 
Po 2 Review 
> 
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