The sun., 1891-07-26
NOTES oN SCIENCE AVID ryDusrn,

'oAHS Wv SCIESCE AND INDUSTRY.
Anew process for the reduction OF reirac,orY
ores. described In the London rapers, ia da.
claied TO be the most simple and inexpensive
yet contrived and. being free from the com.
plicstions involved In the usual methods. ia OF
especial value In the treatment OF gold ore.
The ore, having been ground to powder, ia
transferred to furnace. where II IL subjected
to thorough roasting by hot air with the re.
suit that complete oxidation Of the inirac,.
able sulphurets and arsenical ores takes place,
the gold being freed by these artificial means,
Tho next step is to pass the ore. now in tho
condition OF a fne rouge.iike D. oduct, to tho
VIII water until tie gold has rnsse y 70 ftonn
ready Tor retort 1"Re IN ihe abotanddrs e and Is
a furnace @ suitable tor this purpose may. /, |;
Of treating ton oi ORC BY bis sImrle mSaSs
need scarcely amount TO .S2 Thus, tho ors
from certain sna nina n .ead ey ne
gold to tho ton. while by this nrw rroccss ibo
result hs: proved TO hc. roughly one ounce oi
One OF the most Ingenious anu at the .am.
time practically useful among the au,oma,io
machines which have been introduced Of lnto
is a device which forms. Nils. vel :hs md sen,s
packages In those establishment, where lar-e
quantities Of Rools. such ns flne.cut to! 90.
soda. starch. &c.. are constantly nut up. The
operation BY which this result is accom- ishel.
though decidedly novel, Is nat at all complex IN
any particular. tn. machine consisting merely
Of series Of forming blocks recrrtacles fold.
s h"rSnny sss tho ~Unsns Ensknx.s s %
bineps cna tn.
which instantly aftrrward is wrapped nru,in,i
psr sncks are then ni nnsed into rHcetacies 't i
Intended. nalS folded on top @ and ndsa scale cG' arc
Tho diilculty In making IN effective strong
joint between tool and ts hariio has louy
been felt. and the disadvantage, thus involved
are well understood. not only in respect to
looseness In the Joint but to the rosi,ivs ,nck
OF power. But the invention OF Tho Manne
mann process for the pro luction Of tuars
direct from metal blocks. would now apl ear to
have rendered both possible aud .,esii abl the
making Of tool combined with its nandlo:
that is. hy means o. TINT PROC S. tuhes are
prod, ced having solid portions q, ono or more
r"da may IA Be- maae IN AMI any 'ese sou,enie"f tnn,"r
lengths. with ,alid nortions at regular
by cutting through sn.h solil portions tho
tponding pum6Sr II blanks ior to !, Dy cat
ting such bars through at convenient points.
as the size or long will -ho~to be nest. et b
se' 'tion Will consist o; = hollow rart which may
md the, solid pnr'. which can he shaped Into
the tool head by forging or stamping Vu.iOus
possess greater degree III strength and dur.
ability than tools Of wEi h the han los ,orm
separate piece.
I5he engraving Of glass by the opake moth,i
has e'n la'eiy brought to high degree of
pefection by q Vienna artiznn and chemist.
Hydronuo ic acid Is neutrn'ized with few
CRYSTALS OF soda and the iluorlde OF soda thus
obtained is diluted with i've or ak times its
NNttt ~ =
10 be obtained with 24o cubic c-ntimetres OF
hydrofln"rc acid. 60 grains OF poxtored
CRYSTALS 81 soda A. d ion cubi, centimctres Of
water. The bnre surf ce of the glass liz Sub.
mi,ted for lew minutes to tho action "f the
Of hydrouorie hSfe nsihsns lSt sI"xsS shsS
the plate. a'ter. >, being washed. IS dried
tion is poured uoon It for opake engraving and
allowed to remain for an hour: the liquid is
water the atter neng left uron the glass until
thin reiiciI OF h sicn,e I%rns ~ pGn To ths sur;
The sonon ynrous dae.s of e opsey may ~
be Obtained. the latter is 90 great. It may
Be diminished BY n new solution Of hydro.
In now construction OF rotary engine Il 10
claimed that the motive power ie utilized to
the greatest possible ADVANTAGE In this
arrangement tho frame supports . cylinder
made in the shape OF . ring having IN annular
recess. closed at one side by ri,s-shaped
head. while the outer edge Of piston extends
centrally into this recess on tn, inner side OF
the cylinder; the piston being made in tho
hearings Of the frame, The wbeei-shaped la
against which the steam l. taneentiaiiy y direct
nyader o enSs ns.
are come ed by short branch tires with r'fps
extending a'mos, entirely around tme cylinder.
this latter rire being also connecteI at one
m nT,nIy - AI
at its other end. The series II in'e' nnrts OIL
low each o'her at Q l,ial distances around the
mort CONNECTING with pipe leading to the mt.
eiie. BY this arrangement all but one Of ths
constantly filled with live steam. each DIS.
charging rs IT reacnes the "xanu:t 10 t. To
Insure in the s.eam.s Ght iotati"no the piston IN
rings are provided. 10 be pr'ssed H:nIn It ihs
side. OF the cylinder hr .et ~rrers At suitabl,
distances apart in each ontor SIDE OF the
cylinder.
Tho use OF sulphihe Of carbon ia well-n.h
dispensable IL great variety Of indusiril
purposes an objection to lis moro extensive
employment binG tho very d!sa greenhlr o Tor
which heretofore has been considered insep-
arabic from its use. Necentlr. how",er. q
method has been dev sed TO- removing tbs
cdor. and the treatment is said 10 be snr.
cessinl. The plar consists in n'st s'nking
corrosive ,ubii mate. this s op"ration be' =. re:
p,ated .eve!nl times after lon or "r sh rtsr
intervals. and by mans Of VIII ch trrniD .nr
Ger ain .sulphurets pre produced. anI ,Hhi"h
cause the sait oi the ii ercnrv 10 ,ur" b'n'k.
Aisr thi. has ben accomr shed. tho l'r.ii ie
to . distilled. and that whi"' passes over " II
be ,ounL to have n much less cisa-" enh'a
smell. IL under these cir'"m,,,nnc.s ".nc;th'ri
oil ITS hulk OF OIL oi almonds b, added. the r.-
suit is very satisfactory ~. sn'rhid. en:''ina
an odor tha, is .i,!it" agreeable. tein: some.
what iike that OF e her
As The result OF n serie. OF most careful RI.
searches In o the cfr ct produced nnon IRON OF
the various rrescr;ative Substnn cs " irh
have been brought forwnr BY inventors and
metal urcists Prof Lewcs ub bishes 1t as his
conclusion that protrctivcs OF tho class OF tas
and Its derivatives. such a pitch. black VAR
nishes. asphalt. and mineral waN. 6. ere among
tue best The small quantities 81 ncids and
ammoniac salts which -oir'nuently occur IN
tar and tar products. must; hnwry r, Do
wholly removed: and IT, in addition to this.
the s"is Of 'Mb.,nnIes msn',0nsa are
found on tho surface OF the metal