The sun., 1892-02-07
NOTES ON SCIENCE AND INDUSTRY.

NOTES ON SCIENCE AND INDUSTRY
The peculiar fact is remarked upon in thu
Engineering .Joarnal that. rs COMPARED with
English practice. the sand blast process has
found but littlo favor in the United States a
single company in Sheffield using at least 200
horse power OF steam in It's operations and
tho application elsewhere In Europe being OK.
tensive for various purposes In Sheffield the
main utilization in this line is the rccutting oi
new files to improve them. Tho process is
Familiarity which files are cut with chisc!s that
raise " shayIdss vim w, Or teG ,n sss asse hbens Of
crumhlcs or breaks. uniess tho cutting is ssii.
fully done md the steel Of goonl quality, whon
angle. SO that the sand impinges on the lacE
OF the teeth. cutting away ths thin edge. hut
strong cutters without the thin curlcd edge
left by the chisels in cutting, Tho operation
i very sd 81 he II sw
Sed't poysd IN this pr process but mixture q sandy f
clay smd xsrs OF clay SS GTS.s, wna
Il may nh he called, is drswn in by Induction nos.
n fe sssd a sSs sSn s n s% sWsy M % s
rapidly.
Tho loss Of very considerable quantities. "
fine gold in placers. in ordinary Hydraulic
processes, and even where undercurrents
are usei. hitherto has seomed impossible q
prevention. Lately some progress las
been made In the line OF eliminating the
heavy sraves. saving the fine sand and sit
and treating this restduum with mn amalsa.
mating process. In this way great economy
being accomplished in. in the % amHunt mount Of water
however, a machine has ,been brought for.
ward Tor efYecting tho object in Wow. tho
tested t satisiactorily. The chief feature "a
this invention is the saving OF the water with
screened through four graded screams and
goes into n hopper, where the water is turned
sn.s en sna TSm @ 'ns II ME
tacle where the sediment is ALL we'd to collect
and Ia then treated.
An improvement in tho construction OF an.
healing furnaces is announced in a London
journal. by which prompt action and consid.
erable saving are insured. the method being
applicable alike to sheet anGealing. hollow
ware. malea5e iron. and shcettin cr s:eel-in
the case OF the first named Che time being
shortened by some flfty per cent. besides other
advantages. The furnnce consists ~ -four
oater walls, within which. by the erection 81
two side walls and "no end wat. i a second
Sases from the outer rsa Ma
walls into the middle @ cham Der. and 2tter ;ray
flues furnished with damprrs. To the chimney
stack. Only one fire Is used. and the pot con-
ARRANGEMENT subjected TO = uniformly lis
tributed heat: hence tho pot does net suffer
lasts longer The uniform distrihGtion Of lie
heat tnsurcs anneaiins in shorter time, and
likewise causes reduced fuel CONSUMPTION.
An arrangement OF mechanism OF recllia
practical value in mills for the manufacture Of
newspaper has recently been introduced the
plan originating. it appears. at the weil-known
mills of this character in Turner's Falls. Mass.
the object being to do away with the heavy
and clumsy iron tubo in every rol! Of paper
while on its way from the mill to the printing
this purpose Is accomplished. consists. briefly
OF an expanding shaft on which the rolls Of
the the next roll v hsn the paper is ready for tie
press at the printing office another an e1rand.
the shaft being taken out at the mill. The cost
OF the iron tubes is thus saved.
In a lecture before the Society OF Arts. Bos.
ton. some OF the drawbacks to the popular use
OF aluminium were set forth by A. E Hunt. The
pure metal. he said. Is softer and weaker than
the commercial variety containing three to four
per cent Of mpurity and the tendency OF the
metal to become coated with thin Aim o, OK.
lido on exposure to air gives it q dull appear.
I. loses IT'S tensile strength aud much OF its
risidity at 400 to 500 degrees F.. becomes rasty
at 600. and melts at 1900: it does not roll or
cast well. and its conductivity for heat and
its tensile Hey yst1eneh "" ns not q
only; sbSst ono.third that Of stT"rtarai str" a''d
Is only ABOUT SIKH t.at o, m cast irn TuT
ther. !. bar OF aluminium one inch square ana
fleets two inches with a load OF ~ pounds.
Wills, ThiIe 81 similar % bar oi ca. irpn seauitss
the moduSs OF Of e.stets la IN the casa cast
one half that OF cast iron anil one third that Q,
melting point of steel. statements TO the con.
however is said t. be overcome by al,oyiugt
slightly with hardening meta! or hammerins.
One Of the lonG-sought Inventions is now rs.
ported to have been realized namely. a ma.
chine by which Sisal hemp is rendered suit.
able for commercial purposes. and this with.
out tho disproportionate expense which has
usually characterized contrivances for tbs
purpose The object OF the machine-that 4
working out in good condition the finre tron
the plant is said to be satisfactorily REALIZED
in its makeup and action t. a degree ul.r
par,iallE, attained therefore,: thrs. !, is s,a'e'
some ,EnElish,male mnchi''cs,, hnv" teen
at other points. but owing to the fact of their
cutting the fibre when oner",lrg, their
and nrs one
iibre Leaves it. it is ready io- he market e1.
Prof. Stokes OF London has lately demon.
strated in IN ingenious process Of expert.
menta.ion the long supposed rresence Of sus.
pended matter in fame. which has been \
much discussed question among chemists.
holding tn fhanry nnl a