Saint Mary's beacon. [volume] (Leonard Town, Md.) 1867-1983, 1886-08-05
How the Unexpected Happens.

Things perfectly familiar TO me-
chanics engaged in one branch Of
industry are often matters of great
wonder to workers in another branch.
Men may work lifetime in cast iron,
as applied to tools and machinery,
and yet know nothing of what it will
do in the heating stovssef blast fur
mace. To such a man j discovery
that easfirOn heating pipes growfrOm
six inches to foot in length by use
would be unexpected. To tell the
blast furnace man that certain core
bars used for casting pipes changed
their length by three inches in casting
twenty or thirty pieces, would be no
surprise, until you supplemented the
statement with the fact, strange to
him. that they grew shorter rather than
longer.
The unexpected sometimes comes
from causes perfectly self-evident,
after the thing had happened (as was
nay experience by the clogging of a
nail machine by the scale from the
nail plate and at other times from
causes utterly unexplainable. or from
causes which are difficult to fathom.
In practice. we use with a fair de-
gree of success, for piston-rod pack
ing, simply an easy fitting Babbitt
Lushing. When these bushes become
worn so as to leak, We close them up by
COMPRISING them in the water cylin-
der of a sort of hydraulic press. In
this operation a mandrel somewhat
smaller than the piston-rod is put
inside. aud with all the pressure we
can bring to bear. we have never been
able to compress the brush so as to
grasp the mandrel tight, and yet in
two or three cases. perhaps a half
dozen. we have had these bushes Zone
of them after running year, shut
down while the engine was running.
50 as to grasp the pistor-rod as if
capped in wise. SO as to break the
Snshes asunder, or so that we had to
.Gssort to destructive measures to get
them off.
IN the formation Of embossed work,
male and female dies are used, and
tho female dies are often made by
driving the hardened male die into
'blocksf soft steel. This operation is
issAly performed by few blows of the
dr9pShammsr. 1t drives in and raises
The soft metal without distorting the
kkSeks iESany respect. Whereas. if
tbs SaSesN% operation is attempted by
,AiSsns OF AsAydraulic press. the block
NfasyShs NRsA one fourth it's depth, the
IssNs or the piece crushed
WSfhsM NPrOdpcing an impression of
Me SsleS efarther than a slight line
SlasfsassEjEtAs
rNSSaSHsiSs With l2xls inch cyliu-
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rsNcI'sions psuS&inute. standing usu-
ga 4aSsSloT q ca4t-stons foundation.
lgIee deANSithout apparent cause. it
began to shakeNkiwise, and before
night had SAken itself loose and had
.EsiSssmsqNOf thres;S.teenths of an
iSeSskvsy turn. The engine being
co@Snsd no harp came to it,
accept the ieossuiug oflNe foundation,
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