The New York herald., 1850-08-21

changes lake place AT 90 degrees II remains trans
parent and EDpd al 81 degrees pellicle begins 10
form ON the surface, and soon after 10 begins grow
slightly yiscd, and as the temperature desoends it
passes through different degrees Of viscidy like oils
Of different qualit until at 70 degrees t becomes
sense btmhuid IL is unexpected result tb AZ the
addition Of one part in four Of rosin whose melting
point Is near 500 degrees 20 lard whose m.n, no,ns
is at 81 degrees should render il mere uid rspcin
its melting point to 80 degrees imparting 10 II ths
properties Of semi fluid At temperat,,re ss law
TO degrees, and rendering preparation of A
softer consistency than lard itself at perature a
low as co degrees This compound of lard and ros!u
has therefore, two somewhat remarkable properties
j. II prevents in the lard and probably in all the ami
NAL oils and fats, their tendency to generate an acid
and thus 10 undergo spontaneous decomposition. A
much smsller proportion of rosin than Que fourth
gives to lard this property destroying it does the
tendt ncy Of these substances to oxidation Several
important practical applications result from this pro-
perty. Its use for lubrcating surfaces OF brass
copper has air ady been adverted to 1t is tally sp
pcable to surfaces Of sheet iron. have found
thin coating applied with brush cient to preserve
Russia iron stoves and CRATES frG. rusting during
summer, even in damp situations usually add TO II
portion of black lead. and this preparation when
applied with brush in the thinnest possible film,
viii be found complete protection to sheet iron stoves
aud pipes. The same property renders the compound
of lard and iosn, valuable ingredient in The
sition OF shaving soap. The quality OF shaving soap
is greatly improved by larger proportion ofeon than
s usually employed, so as completely 90 satursts the
slkili; hut luch soap easily becomes rsnsid whom
wet with water and suffered to remain damp as it
commonly Is wbtn in use. II certain proper
tion of this compound is added to Wind
I
grow rancid rs prevented very soft and agreeable
shaving compound, cream may be made by saan-
ing IN close cup cake Of any common shaving seap,
10 reduce It to soft consistence and then mix.
ing intimately with It. half it's weight of resnous
preparation, sddng few drops OF some odoriferous
substance. fhe saIno compound forms excellent
water proof paste for leather Boots, when treated
with II, will soon afterwards take the usual po-
lish when biscksd, and the soes may be sa-
turaed with 1t without danger OF solng the
floor, as IL does not rub of, while tho leather
is rendered, in a high degree. impervou. TO water
heated with oil suggested the possibility Of Improving
in this way, the quality of oils used for illumination,
and by its ducng tho melting point OF lard to rea-
der that more suitable for burning in solar lam ps
therefore added powdered rosin to lard OIL in the
proportion Of ounces of rosn TO gallon Of oil
and applied moderate heat, sufficient to produce
perfect solution then hlsd two solar lamps, equal
in al respects the with lard oil, the other With
the same, holding the rosin in solution and regua-
ting the flames soas to be nearly cfthe size
Comparative iptensities Of light, which found TO DO
as7 10 In favor ofthe prepared oil This burned with
flame of peculiar richness, plainly exceeding Ia dem
sity that from the simple oil sut after two hours
the flame Of the prepared oil began to decline slowly
and became Inferior TO the other effect which
doubtless from the clogging of the wick. had
hoped account OF the perfect solution which the
rotn seemed to undergo that the compound would burn
freely without encounterng this impsdmenti but in
this respect was disappointed and only say that
IL some be devised for avoiding the tendency
to clog the wick. the addition Of small portion of
rosin TO lamp oil or lard will AID essentially to its
ue for burning In solar lamps by rendering II liable
TO CONCEAL and by increasing its illuminating power.
Mr. RynstsiD made some suggestions with regard to
the application Of these principles as spoken Of BY
Professor Olmsted
temperature bad been observed in the experiment.
Professor BAoHg remarked that the fusiug point OF
most chemical compounds was less than that OF either
Of the ingredients.
The second communication was made by Professor
sLLlm.s, Jr-a notice Of the American meteor irons
he believed TO be meteoric. The other specimen
from the vicinity OF Pittsburgh, Pa.
Professor RoaErs remarked upon the frequent pre-
Professor Loomis was then heard upon the proper
height Of the lightning rod lie ssid-Ths rulo
prescribed by the French Academy Of Science, and
copied into almost all the works electricity for
deter mining the proper height OF lightning rod Is
that rod win protect csrcle whose radius is twice
the height Of the rod. A case recently occurred In
Tsllmsoge, Summit county, Ohio, which appears to
demonstrate that this rule is unsafe On the aftsr-
noon Of July 27h about six o'clock there slight
ming One flash remarkably vivid. and sue
eesded almost instantly BY loud report In an In
ust .ae Of ssrass shdp pns wa. iouna IN is 1ass
The shAyipgs had recently been carried out u tho
s9g and ss,s quite dry and =, no ss had been used
Is known N which the shsvings could have been
igDitsd q e inferred to have been caused By III:
electric discharge. The carrisgs shop furnished
With lightning rod and ID . matter OF surprise
th.t the huid should have struck the poand near
above the shavings, ana the shsvinss 100 feet
distant rom point vertically under the top OF the
should have afforded complete protection to distance
Of lis feet from is bsss whereas the shAvngs wpre
struck at distance Of 100 feet and that too, where
teing elevated only few inches above the general
level Of the ground they might be presumed to afford
no peculiar attraction for the lightning This rod sp-
pears 10 bs,. been eonstructss IN sccordance With the
usual rule IL s tcrninAted by three points which
are sildsd, and appear TO be In tosrsby good ooni
tion About ten fret from the top u break In the
rod and the two portions are looped together From
this point the rod IL continuous 10 the bottom, aud
enters the ground to tho depth OF about thrcvfeet
whore the earth at the time referred 10, quite
msist The rod Is about nye-eighths Of an inch In
diameter. This case dsmonarstes, to my mind, that
it Ia urssfs 10 rely upon rod to protect . circle
whose radius Is more than once and hslf the height
OF the roo ~ least upon the vest sds being that from
which thunder showers generally come In this lAti-
tpd~.
Professor nsrrr gave sn account Of some expert
by Q ball. which was struck By lightning in three
places, during storm which occurred amer Its
tion.
Professor HoRsorp called attention TO The breaking
Of pine trees whez struck by lightning
Professor Roosns referred this to the preecnce of
resinous matter In the trunk Of the pine.
Mr. RrpyrpLD mentioned that there peeulisrity
In the lightning MARKS on the beech trses lie ssid
| that perhaps might render 10 liable 10 the elect
| spoken Of at yesterdays meeting
Professor HSssr said with regard 10 trees struck by
lightning he had found, upon examination, that there
would not be the slightest mark Of electricity on the
Upper branches, but IL appeared To strike at the
trunk. at that part from whence the branches spring
killed In house, by lightning an q, Afterwards this
! outline Of his figure remained on the wall % II the
I electricity had gone into II.
Professor OLrsrED said that they had had storm
\ few weeks ago In New Haven, and n very pesu-
liar The lightning was vvidby its continuity rather
than the intensity and II accom- panied By con-
slant roar OF thunder; vas rather pushing TO him
TO kno- Why there was apparently 80 much lightning,
and 20 little damage done lie thought tLat In such
cases the clouds very high, which h,o.s rsnaes-
I ticn, and dminishss the sound
Professor IfErhr remarked upon The color os escre
tohargss he observed that when the color u red ID
10 TO be inferred that the el, csicity 10 very high.
kst a p0 nd n tpsp peu
Of air be nioped that the tin coniosl signals
on the coast survey we're frequently thrown do-n,
vhils the poae was not njure
Professor otssrsD alluded 10 the firing of gunpow.
der by electricity By the interposticn of . string
He slso mentioned the case ofsevsrsl tin pans beag 10
the path q the electric dschsrge and that ths psns
wee perforated on the oy posite aide
Professor Hsssr ssid that this due 10 the &C.
ann patsn Of ,lsetrieity in psxspu from one nan 10