New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1873-07-12


Moron FOR SNAIL MAcHrNEs.-Les 1oTdes ssSs
Its readers to examine a new motor constructed py
Lambrigot Of Paris, which seems well adapted 10
small machinery such pumps, sowing NJ ;
organs, small screw vessels. &cl by reason OF ITS
small size popularity aud ease OF m9Veineh' WIN
small consumption OF ether or alcohoL
y, BRErpfNG RABBITS FOR FooD.-Hochstetter of
IYbinren regards the rabbit as the equivalent
among Che poorer classes of cattle among the
realtbier and earnestly advocates its cultivation.
He gives detailed estimates of expenses and of the
receipts. from meat aud skins, which make it APP
poar that single doe rabbit will afford clear
yearly profit Of from SIS To $40 and states that he
expects with three doe rabbits, tO have rabbit
roast twice per week at a saving OF about S24 per
year for meat.
CASTING METAL IN VGcUUM.-In order to avoid
she difficulties and defects occasioued by the air in
closed in moidS in casting. especially with works Of
art Cumn aud Martel have devised the plan of pro-
ducing the mold. at the instant OF cast
ing, 10y connecting il with AN air-pump. which re-
moves the air. The interior is faced with sum
cienty porous and refractory material Varying WIN
the nature of the metal to be east dried piaster-
mortar answering for sneh as are readliy 5usG?MI'
such type metal pasternortaf hilNeu Nun ION
graphite alum OF other materials, well ground 20
getheT and thoroughly dried, Tor tne icsS l'suio'
such as bronze ard graphite alone iOr the lhos' re-
tTactorY, such as IRON anu Steel
DYEING SlLK.-The practice of boiling with soap IN
the process of securing silk has recently been aoan-
doned: and t is, instead. simply plunged IN boil
ing soap, bath containing One-quarter pound Mar
sellee soap 10 each pound of silk. until it Is entirely
ungumned when il is turned. and the portions
Of the skens ON the rods secured 1t is then placed
in second bath containing three ounces Of soap TO
che pound of silk, and turned every quarter OF an
hour several times. The second bath, with the adj
ton of 10 per cent of SOAP may be nsed as the hrst
bath for the next lot. The silk by this treatment,
retains more OF its gloss and smOothnesS' and does
not become WOolv as is frequently the case on boil
ing. 70 dye t brown soap II and ground II without
washing in the clear liquid obtained by boiling tour
~ five of tuTmerc. and allowing 10 10 settle
Then wash twice place from 10 10 IL hours IN an aipm
bath wash twice again, and dye at ll3 with fusrc,
arch1 bTaZil-WOOd, l0gWOOd and some soap accord,
ne to the tint desired After dyeng, " ~ cleansed
with fullers earth. well rnsed, and cleared WITH
little OIL dissolved in solution OF pstasb
NrrKo;sN IN FE.TTrIzHRs-Prof. HelI1egel made
n series of experiments to ascertain whether ferti-
hzers should necessarily, only restore to the soil the
mineral ingredients removed with the crops as Lie
big contonded, the atmosphere being relied upon for
the nitrogen; or whether as Stockhardt considered
experimentally established. vegetation did not
q
addition of nitrogen TO the soil Eight vessels were
exhibited which had been flied with lDe sand. pre-
yiously thoroughly heated, and two planted respec
lively with peas barley, buckwheat, and rape seed
and to one of e,ch of these different kinds, nitrogen
had been added The plants in the latter appeared
well developed, while those in the others were
Ftunted Ho concluded that nitrogen is essential to
growth that of the atmosphere not suficng for
thrifty growth, the first leaves being developed
from the nitrogen of the seed and soil Also, that
she richer the soil IN nitrogen tile more luXuriaht
the growth, and the greater the amount of nitrogen
taken from the atmosphere; and that consequently,
nitrogen i'm fertilizers Is not only beneficial, but
necessary. Further incomplete experiments upon
the effect of moisture warmth, and hight indicated
Enthusiastically that water ~ not only c1rrlel Of nu-
manly on the SOIL for water: tat u &c Il sur
priSng difference IN growth other cOna tons being
identical. when ample supply of va jr above the
natural quantity Is gwen the soil.
ZINcKrvG R0N.-The following is an excellent
and ohear method for protecting iron articles ex-
posed 10 the atmosphere, such as crtmp-irOns for
stone. &c, from rust They to be fast cleansed
by placing them in open wooden YES, ls. in water
containing to per cent Of common sulphunc acid,
and allowed to remain in it until the Uiacc appears
clean or may be rendered so by securing with rag
and wet sand. According TO the amotnt of acid,
tins may require from to "a hours. Fresh acid
must i've added according tle extent OF use
the iouid and when this is saturated with sulphate
of iron il must be renewed After removal from this
bath. thu articles are Finsed in fresh water, and
secured until they acquire a clean metallic surface
and then kept in water in which HCJe slaked lime
has been stirred, until the next operation. When
thus freed from rust they are to be coated with q
thin film of zinc. while cold by means OF chloride
of zinc which NAV be made'by hliJng glazed
sarthen vessel. Of about % gallons capacity, three
fourths full OF muratic acid. and adding zine clip
pings until c1eryesccnce ceases. The liquid is then
to be turned oft from the undissolvel zine and pre-
xqrved in glass vessels For Use IL is poured into
sheet zine vessel of suitable size and shape for the
objects and about 1-31 per cent OF its weight of
finely powdered sal 8mLnOnIaC added. The articles
are then immersed IN 1t, "A scum az hne bubbles form
ing the surtIce M from one y two minutes, IN
dicatiyc OF the completion of the operation. The
articles are next drained, 81 that the excess may
Gov back into tho vessel The iron articles thus
coated with tine film of zine IRE placed ON clean
sheet-irOn heated from bencrh, aud perfectly dried
and then dipped, piece by y &C. by means of tongs
into very hot though not glowing, molten zlnc for
short time. until theE acq Ire the temperature ol
the zinc the surface % the having bern cleaned
with an iron spoon. They are then removed, and
beaten, to cause the excess % ENC U f9lI on
ExPLoStyE Oms-IrOf Atifcld, in 4 lecture uson
the relation Of animal and vegetable ola to ire
marks that in themselves. they much safer than
mineral oils since they do not ignite at low teu
peratures nor give or vapOr which, when mixed
with certain portion Of air, eXplodes i'll contact
with fame. On the other hand in their liability TO
spontaneous ignition, Nhen freely exposed to tho
air under certain conditions, they possess danger
Gus property from which the mineral oils are free
The animal and vegetable oils differ considerably
among themselves in the rate with which tlsy cause
the generation of heat On being exposed 10 air upon
the surface of fabrics shayiugs. other materials
but all are more or les liable 10 this result whom
spread out in thin Gin, III any other minute state
Of division. The sp-caled drying oils' are par