The morning call., 1894-04-15

ITO CoRREsPoSDENTs.-Th Query Column
will answer all questions that 1t ~ possible 70
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ALUMINIUM aluminium. Berkeley, Cal. Al
uminuM. the coming metal, is OF beautiful
white, exceedingly malleable and ductile, non
corrosive and very light. The ultimate tensile
strength is about twelve tons TO the Squa'e Q
inch. The range OF its elasticity Is about three
times that of steel and ive times thai Of iron.
The metal was first discovered by WOhler 10
1928, aud at first 1t was very costly on account
of The expense OF producing It. By various dis
cOverieS the cost was III 1868 reduced tom &6
an ounce, The original cost, to 40 ceEts Since
that tine other methods have been discovered
that have reduced the cost Of production down
ITO 30 cenls pound. By means of the electro.
lytic method OF preparation there has been
m enormous reduction in the cost OF producing
aluminium, particularly at the works Ia Neu-
power. 90 that metal of 80 per cent guaranteed
purity Is obtaiDable there. Alfred z. Hunt Of
the PittAburg Reduction Company which has
made many tons Of 80. so per cent purity Alumi-
mum. asserts that the Hall process will enable
the company 70 produce the met0l At 20 cents q
pound, and possibly less. Most OF the alum!-
mum now manufactured 10 made by the hall
process or that Of heroult At Neuhausen. In
each case The reduction Is made from the
oxide. The importance OF the Hall process.
which up TO date is the most ouceossfu 10 that
are considerably shorten, d. The process iS the
eieetrOlyzlDg Of 4IuminA dissolved in Z fused
mixture Of the huOFtdet OF aluminium and other
metals The mixture OF fuoiide aata, consist
log Of duorides Of aluminium and R00lum. or Of
aluminium together with nu0rIdes Of any metal
more eieciTO. positive than aluminium. ID hrst
placed In . row Of iron tanks coke lined, and
KFammes Of material for obtaining pure Aiun't"
num. TheUe talks or pots are negative eIec-
t1odeS or cathudo0, ana the positive electrodes.
With series Of three-IDeh carbon cylinders at
I.eb0d by copper rods 10 copper conductors by
nBeanS Of screw clamps. Two strong currents
1hno ReneFafed meltS The nuoFide mixture.
Wlloh II q very short time becomes nuid and
niuIins y then added. Then THE action OF
sey.l, o. chemical aSt,"1 .H.Hs'o 01 eisstss
0n1 ~ metal tlnkO 70 the bottom Of the pot.
Th1191eon Ho08 20 the positive carbon cleo
Ro11, 1nAlnG Wl:b part Of Ihe SAreOn ana eS'
1nN1na n e1FAontC acid eaS. The heat 10 70.
1a7S0d Il tA0 molten bath By covering OF
Sa1I1 - eN1orOd carbon spread on the surface.
IN ~ 81 thID eoTOOa powdered aIun1in0 10
Ss~sS1. enA - lnseEvAle this 70 stirred Ia the
knSia Sofo1I ene carbon rising again 10 the
s106e ~ rnaWklnR aud nslMG a9"1n protected
~ n s'iIIiSE q do powder. Thla feed!nk ts ear
SezS Sn1ly TOR days as time. The
ss1s1fo1 =. RI f6fS nseih01 70 dotAen0d lr0m
~ f ,te1In ids, has . vary nIRn degree
- tSstSS M elaluR pSs0O Of the metal at sails
ii,.1 s. q 20 eeste poand: & Tnc Dsaress .sa
1sss~,s ~ ~ r. 30 b TIE Wobdtng Of alu,ninum:
- y DetbeA tex Welding Ainmt.
..SA2sS<as - aa6 hAo proves - eetlD-
41.sk p4Nvo0 Of gIoAtoe
.1cs,,stI iSiol ~ D1r6 The woldi1E DEo0.