The sun. [volume] (New York [N.Y.]) 1833-1916, 1892-10-16


NOTES ON SCIENCE AND ISDUSTRr.
A simple method OF purifying crude gut;a-
percha ia proposed by n French chemist. as un
improved substitute for tho rresent lrocess.
Tho operation has ordinarily teen accom-.
olished by mechanical means. willis that
now brought forward is Of n chemical
character. and. notwithstanding: It's cor..
p~nrative Responsiveness. tho results ere
asserted to be far moio satisfactory. Tho
raw gptta- rcrcha is ii-st dissolved Il.
by the. filtration OF tho undissnlved matter.
tnts solution being then passed int :. SERIES
porcha separated from tho i,ui,. rlIt,,.iAi iy
reason Of the difference. IN density the ,,irs
and tho bisniphido eVap"rate,i. Ills resnitis.
which REQUIRE to, Le removed. this be,nr II.
iected Dy, dissolrinG, in b0n7!nc. WHO'D to
rcsin, and Cutt.- ucrchi separate. an,! each
may 10 drawn on e.ii;rntety, The o%iLi-sd
Su:tl-Dercha. alter oxidation. ia treated in THE
snimc manner. forming. IL course. n product Of
Inferior qualify.
A now radial f.iljin: machine, Of r~ccaiiar
construction. is amor. the receu. English Az
nouncenents Two drill spindlos arc mad,
usc OF. ono bein: mounted or u horizontal arm
In tho usual way. and the other placed upon
an arm carried By n horizontal standard. n
such q manner that the two are always at
right angles to, each other, The arm
weight. so that it cin easily les swung ia.n
any desired position: since. however. tho sad
die Il moved In and out from tEeii1o; Of the
is necessary that tho balance weigh: he moved
IN and out corresoondirEly IL ,ricr {, main.
hand trav,rsina screw for tha sact!!o i. pro.
longod past the pivot, and continued as a left
handed screw under the balance weight, With
which It liz connected by n lett hand nut. Thus.
on operating tho travcrsiaG ser1N.. the drill
saddle aud balance weight move In and out
mainsainei.l 10Th, jriIi spindIes fnve
extreme range Of four Feet six inches from
the centrs Of the pivot.
1t seems to havo boen demonstrated that
rireting by electricity Is a successful thing.
ono that will tako its place among tho most
improvements in tbs Industrial
arts. The apparatus consists Of a trA..,-
former. the primary OF which Is formed Of a
heavy copper bar laid parallel TO u coil ,: Ine
wire. and oyer tho two arc clanled angular
completed iron sheil-increaslng by ibis ar.
rnngrmcnt tho efficiency. n! conversion: ths
tho copper bar. and in the end ct the bar ars
s @qsntG Tor an movi hny''; hn nn Sr : rssuInt'ns
OF y primary l., p!acel q choke coll. prov'!si
with aiegn,stIns switch, f"r cutting II: :aols
the current ',.rIccd In tts ~sc.oni.Iy mA, %
cont, ollno. Tho bars OF pieces q: n.eL., "a
PLACED upon th1 anvil ann the i've. ironpetiH
the plates Of meta, arc hrmly held Seiw eea it
a and TIE Two !ns.latinG ,e:' secured to the
bar. is covered with. insulating meterlal. cx-
a. a central roint. where It Is left bare.
establishes connection from tbs upper limb or
tho primary bar to the lower limb. chs current
developing sufficient heat 10 mako ar ups st-
ting ~ tho r!veI shank very sasy unior tho
~ this screw.
Tho substitute: for glass brought to notic.
eomo time AGO Ivy c macr:aoturer III Vienna.
Is pronounced : practicable thing,
likely TO be Introduced 81, valuable for certain
The article is produced by dis
solving from to,r TO eich: parts OF colIo!lon
WOO! in atou: orc huLurct PARTS hy weight of
other. Or alcohol. q. acetic ether. md with this
are intimately co,nhiaed !-ori two to tou. per
cent. "f castor oil and four to ten rer cent. OF
when poured nrnn a glass plato am. ,sWtIn"tei
fifty dcGr;es. Cont" solidiies III a com
like slieeso or plate. tho thickness Of which may
be regulated as required. The sheet or plate
critics as .iass. d resisting re acton Of 81 salts st adj
aud Of dilute arids. and. like glass. Is
t,sns2arcnt and has n, smell. Again, It IS
Il great d"Groc. while its iniinm nahi!lt" is
much less than that u tho c9lloli"n suGSti-
tItCS. Ally ttSlCSl Cb4DT may Dc lIlI,Tttt. To
pigment. tho latter to be soluble in the
used in the nr.rarat!on Of the com:
may he impaired 10y ~surf:cn, application, anil
line jics being employed. and Illus the sheets
may be used in lieu Of stained glass
For some time past a series OF very impor-
taEt experiments havs been In progress. un-
l.r tho direction Of tho Austrian Society Of
Engineers. on tho resistance ot masonry
ircl.os. Sufficient l.. npw known OF tho
and elasticity OF stono and cemcnts
. render tho theory Of tho elastic nrch aprli-
liable To masonry arches which have heun and
'tili are designed purely hy .tapiric!sm-rs- |
marks q writer in. Enpi""e'iaJ-so that In
many cases worry lit;le Is known as to the actual
trrssss carried b. the structures. and thoro
IAN 10 nodoubt that the factor OF safety is in
o be carried forward viii afford the Desired
rs To the permissible, working stresses.
.Ono intorostin. group II those en-
,eriin onts inrlI..es minute researches into
he elastic an. rssistan. rroperltcs q the ma
~ 10 used in constructing the arches
o DO tested another soriss relates to tho brick,
and tc:rG c"tth iioo:s commonly
'sed for warehouses;. naI u third series relates
o arches for bridge, o! seventy. nve feet span.
Investigations and tss:s Of IN encouraging
havo been made In London with
in y solid state for fuel Purposes.
10 cEuuo OH nelnS Elseu WIN II chemical |
ompound equal to about fifteen per cent. Of
Is, weight and being tlon subjected ~ a Il. ois.
OF about 2l2 degrees. aft"r wl.ch i. Is
|ricG a. a high Temperature and compressed
nto the form OF bricks BY e. powerful press.
lccordinc 10 another method for accomplish.
'ig tho purpose, Il given quantity Of Crude
petroleum is first drawn into "a vessel.
with 1t nro mixed chemicals which
re In themselves largely pomhu-:!hlo: tho
'essel containing the mixture sthen p!Gcei
or q short time In boiling water. causing tu-
Ion TO take place. then transferred "a. u tnr-
ace having a temperature Of from 400 to, 300
|sere.s Fahrenheit, tho mixtur" heing kept
TIRED. In y short time so!ill!ratIon takes
lace, alter which the. compound l. pressed
lito blocks Tor use: The chem Gals rnnloyed
or mixture with. the petroleum are stated to
pst only ABOUT tho snnle rs the l:tltcr; ana the
moo PROCESS, from tho ilr-t mixing to sn!idi-
occupied only about half an hour.
nile the se!lditoa article burns freely and
nth but slight ash.
Attempts have seen made by NJ Phu'ssn 10
approximately the height OF the
urora. and tho result has been communicated
y him to tho Royal Danish Academy. 1T ap-
ears that at Godthabb. with two 'lleodo!i;os
h'r miles apart. the height Of IArr"ntnurorp
ma fOnpl w yp ~ fran, .,pa.Ifpl pf n mia