New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1876-04-01
APPLIED SCIENCE.


will catch fire and burn with oeauIipl
gBeciin0 i,,.in,o cerbcnaccous residue. This
gre l., ann 1od to over "a G"leh poi9toH "ilt
- ,.,rr minerals containing ooI"li' ti" ~
perfectly 20 r,. M tI. SclOO of Hines, Co
Qraliat CCac. have used TINS test for two months
with perfect success -
,,-,,,,,rroy OF CmoMG-ALvM.-Although the
,,,,.-slr,n occurring as reiisc pr"'"'. III 'N'
s,r,,tYrs of certain cool-tar co!ofS' Is lo.Ou-
.,,,, c,.es by St:Ohmeyers process INTO
-. in many cases it IS entirely d5regafueI'
,,,~ 70 the tediou,ucs, and eXpenSiye"'S' u '"1'
,,.tb,d A new WAY has r-cenuy D''' 80
b,ch II is claimed, do not LcQnuG o' iot %
ia, ,ryinol refuse liquid, permit ''V ~ C,,r,i ,hes
we ,.srv nj the agent employed ana IuI.li'hGS
PE"uiJ ready for immediate o'i: III p i"""Iin -
l'' ,,1,t In 2 l. per cent "i tc. cli4' '
Sald 10 aiiloui' ~ may even be found prohtab.e,
so INA. "a, {I.nSe in connection with the miAuIac-
- of aniine and allz1Ilhe'
-,.r,,.c Frrs IN C0Cuv CHINA.-in in
..i,,s levice is rracticcd in Cochin China for the
r,,,rs of ecls which consists in cutting pieces OF
bamboo rs thick as the arm into sections OF ABOUT
t ar f,ur feet I'm length, the divisions OF the IN
t.rior beine broken ont, with the exception oil the
ono at the end, which forms the bottom Oh the
snare. Al the entrance is placed slight grating OF
ho,,boo and some bait, either OF fish or earth
- - introduced into the interior The Iimboo
'l";i nj a slcht depth in the mud, and the
i tne er ta. tbc hollow tube. in which they can
scarcely move and cannot turn themselves ana are
conseonently taken captive The hamb9"S are
tLen mn every morning and the eel, which holds on
,re frnlv 10 The Interior is pulled out 10y means
OF a strong hook.
Cou,rsrS's PTPIGRAPH.-TTacing the protileS of
architectural objects, Icy obtaining the coOrdinates
of different points, rests much upon the dellcacy
oftonch and sight of the individual that the results
are not accurate Avery simple instrument devised
by Colausen and named Perigraph eliminates TINS
rcSonal source of error by rendering the operation
purely mechanical one. II consists essentially OF
lever moving and sliding in such way ON a pivot,
on a board covered with drawing paper that Wheh
the board is held by the left hand from LADDER
near "a the object 10 be traced and the one ehd on
tbe lever i, moved 10y the right hand so that the
other end continually touches the object, lGhcil
fixed IN the lever Will trace dnitl Seu prone VI
the object on paper. This can aiterWari be en-
larged to full size by means of the same Instrument
BrIrIIANT ZINC COATING on Brass AND COPPER
The following simple process Is recommended ny
Bittger: Boil large excess of so-caled zinc aust
some time with a concentrated solution of caustlc
soda or potash and place the copper or brass ari-
clcs to he coated in the boiling liquid. By con-
tnuing the heating, after few minutes beautiful,
mirror-likc film of zinc viii form upon them, by the
decomposition ofthe alkaline solution, in consequence
of their clectro-negatve character in combination
with the zinc. Ii is suggested that the process Is
and also for forming a LAYER of tOmbac, by heating
copper article thus coated carefully 10 about Us
to 2slo (bost under olive oil, when the zlnc VIII
unite with the copper support to form gOld-tnted
tombac aud the article need only be quickly cooled
in water or other suitable liquid, as soon as the
desired color Is apparent
MINUTE WORK Is MINERALOGY.-As an example
Of minute work in mneralogy, il may be interesting
10 note the recent investigations of Baumhauer upon
the etchings which may he produced ON the crystal
line faces of many mineral species. Thus, crys-
tails of calcte minute triangular depressions may be
produced by subjecting them to the working Of d.
Iute hydrochlorc acid crystals of salt exposed to
moist air for little time show depress0ns which
have the form of a four-sided pyramid. Hydrohu-
Oric acid, also, will in few moments produce dis
tinct though microscopic etchings a thin plate of
ordinary potash-mica while a corresponding result
is obtained by treating crystals OF garnGts. win
caustio alkalies The interest of these and similar
experiments is that they gave us an insight rs MOTH
ing else can into the molecular structure OF the cIy5-
tails or in other words the way they have been blllt
form Of the etchings produced must he that OF the
fundamental molecules, and, though TINS may not
be sustained, the relation that subssts must GER
tanly be a close one.
THE NEW PHYLLoXEBA RFAIEDY.-Ld Nature, i'll
late review Of the researches of NJ Dumas relative
TO the practical efficiency of the alkaline suipho-car-
Donates rs desToyers of the phyllOXera, affords us
the following information upon the philosophy OF
the operation of this class of salts The sulphO-car
Donates Of the alkalics produced by cacining
their respective sulphates with carbon by which the
monO-sulphide is produced, and agitatnE cohcen-
rated aqueous solution of this with carbon di-su-
phide The sulpho-carbonates obtained as here
described are free from disagreeable odOr are not
dangerous to handle are nOn-nfammable and COM
paratively stable In the presence of acids how
ever even Of the weakest, and notably when acted
upon by the carbonic acid. of which moist arabic
soil invariably contains certain quantity, the sui
phO-carbOnates decOmpOsed into carbonates, with
the liberation Of carbon d-sulphde and sulphuretted
hydrogen, both OF which, and especially the first.
are known to be highly efficient insecticides
1t has been found that it is not only
necessary to destroy the insects upon the
vines and roots, but likewise to poison the earth
In the vicinity of the same and render il uninhaba-
bic by them. For this purpose the sulphc-earbon
ates to be admirably adapted, inasmuch as. by
their tardy decomposition they furnish 'slow but
constant supply OF the poisonous gases for some
days Experiments have shown that ,442 grains OF
the sulpho-earbonate Of pOtassa will externinatc
the Insects from 1913 to 2S4 cubic feet Of earth, kill
ing not only the phyllOxera, bit likewise the laryse
OF larger insects. To apply the remedy it is
mended 80 remove the earth from the foot of the
vine about foot deep and is inches broad into
which is 70 be poured five or Six quarts ,Of water
mixed with SIX 10 eight quarts of the sulphO-caT-
Donate solution at 40' b. When the liquid is well
absorbed the hole is closed and the same process
gone through on another vine. BY following this
method the penetration of the solution to the deepcst
roots Is insured Another method of application
proposed by NJ. Dumas is TO mix the administrations
ate with twice its weight of slaked lime, and TO
strew the powder thus obtained upon the soil wher
ever required.
NUMBERING SILK THREAD AND FABmCs.-The
system of numbering warns by giving the number of