The sun. [volume] (New York [N.Y.]) 1833-1916, 1905-04-30
NEW USES FOR ELECTRO MAGNETS.
Laft Heavy WelEhtS-separate Hard sub'
stances From GrAir-In surgery.

Laft Heavy WelEhtsv-separate Hard sub'
stances From Grair-In surgery.
The value Of electromagnetic a. time
and labor savers for lifting heavy pieces
Of iron OF steel In the industrial world IL
now quite generally recognized. and their
installation in connection with cranes
and other types OF conveyors Is being car
ned on extensively. The designing OF
these electro-magnets, says the AmeriodH
InreHtor. has attained such penection
that their lifting power extends up TO ten
and twelve tons.
In operation. the magnet lie lowered
upon thu material to be lifted, and the
switch closed. thus causing the magnet 20
attract ard hold the material, which may
then be boosted by the crane and trans
ported TO the desired point. By simply
opepinR the switch the material Is instantly
released
In large steel and iron plants, where
there In a constant } accunulHtton Of de-
fective and useless csstinEs, the use Of the
high efficiency magnet ia especially valu-
able for lifting and dropping huge steel
spherical Hall weighing from ous TO ak
tons, which brushes the old castings into
email pieces, 20 that they nay be readily
remelted. This employment IL called skull
cracker work"
The employmsat Of magnets IN other
fields Of industry, however, is OF more
recent occurrence than IN rolling and steel
mills. They are used IN . great variety
Of WAYS, and their employment IN new in
dustries is constantly extending. The con-
centrstion Of the heavy metallic parts
OF ores by electromagnetic and electro
,--FNA h. Nafarnt01 Of tho
worthless RanRue material, 10 a process
which has developed remarkably In the past
The employment Of the sleotTo-mAnet
for Recovering ecrap metal IL likewise an
important development. Both fomdry-
men and manufacturers employ electro
magnetic esparatOrs TO recover metallic
substanoea from waste scrap, Brass, cop
per, babbit, rubber and other m1tetlals
are eeparated from iron and steel chips
in the most economical way,
In plants whore good deal o. orss
and copper are used the waste is placed IN
large mSEnetio cylinders provided With
strong electro-mAg nets, and every part Of
magnetic material, even 20 me iron ana
steel dust. 10 separated quickly ano eneo.
lively. Tbs process IL 20 economical that
ths, price formeriy rsoeivea, i tO1 'no '0'"p
The use Of magnets has more recently
been extended TO -four and rioe mills 70
separate any hard, metalho material from
the food. The tns -four dust which col
iects In hour mills Is very often highly
inhammable, and q spark Of ire might
oauss a violent explosion. The greatest
care has to be exercised TO prev ent any
such accident. One frequent cause oi
such explosions has been sparks prodnoe9
nv RTitty, metallic substances contained
| in the -four being ground suddenly between
the rollers. Such n spark has caused e1-
| plosions that have wrecked VaiuAote MA
/ chinery and started large fires.
The Use Of the electro-magnet In surgery
Il another field which has yielded some
excellent results in the past year OF Two,
! The removal Of metal substances from the
| throat. lungs and stomach has been sue
| cessfuilV accomplished. One Of the moet
| noted cases Of this kind was the remoyal
! Of a nail from the left bronohn, lust De
! hind the base Of the heart, Of a child oy an
! electro-mAgnet. - =,
By an X-ray machine the piece OF metal
was located, and special ma gnet w.
! constructed. This consisted OF an IRON
core hve-eiRhths Of an inch In diameter
] and eleven inches long. tapered at the enc,
/ The lifting power Of the magnet vas iVo
eTammes, and the pull wes sufhcent 70
! attract . single nail through dtstanee OF
two inches BY combining, the use OF the
| X-ray machine with electro-mA gnets, sur
geons are finding the necessity, 81 may
! delicate operations with the nue less
| imuerative than formerly.