New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1850-02-14

Copper presents tins peculiarly, lhat ITS iorce
decreases from 81 Fahrenheit, aud far more rapid
~ than that OF iron while the resistance OF the last
increases TO the temperature Of 5si' before dimin
.,hins Ihc heat 81 water and %! steam az pres
sure OF - atmospheres IS 800.
Iron begins to e1Dw red bot IN the DARK At l,00o'.
and is cherry red at $1,000 At 5000 Il IS perfect
y white
These immediate causes Of explosion. a'ws:s N
arabic are pruduccd by circumstances OF a very
Ferert character, the principal Of which | viii
consider
l. Explosion b, reason Of tad iHatertGis Ev
nv machinist knows how to distinguish good
ron rom bad at first sight, by ringing 1t, which re
,uires for the experiment nothing but weight a.
fsehed 10 cord he can ascertain It's force exactly
. FrpJoston b reason Of bad construction. The
ooiers sustain in their different parts different &C
Inn proceedine from their shape, and the machlniS
nrbt "a vRrv the strength o. the iron plate, Or q
nut supports inside So that each part shall have
resistance in proportion % the action winch i sns
,ains This acton can be exactly calculated ano
every error Of this kind can be ascTIbed only to
1roound ignorance oi the most simple hydrostaiic
avs.
4 well proportioned boiler NAV still burst through
defect in the shape by the fault Of the maker.
Suppose that one Il the surfaces which are heat
cd on the top convex, tins convexiy being turned
low ard the hre, the water IN the convexIty VIII be
reduced to steam. and retained by the edges o.
ron thus eft without wster can become red hot
md burst. The same thing may take place with
lat bottom the slight irregularities OF the surface
retaining 4 small bsd OF steam sufficient 70 permit
The iron 70 get heated.
B. Explosion by reason Of Hsg'ect-lf the boiler
Is not kept thoroughly clean II every part IRON the
sediment daily deposited by the wafer, coat o.
lime viii be formed on the surface tins lime a
bad conductor, and separates the iron from ,he
water 50 that il may get red-hot and burst
1. Erplos,oa By Trasos Of the iMprsdsaoe or care
isssness Of The EngfEsrr-The Engineer IN order 70
get more power viii sometimes load the safety
valve and trusting - the fact that the boilers haSe
borne three fur times the sorre which they are
intended 70 sustain be momentarlly Increases the
pressure. This IS very common imprudence-
neglect which occasions more accidents Is failing
70 keep up the supply q water. The level being
reduced. the top OF the furnace grows hot and be
comes 80 much weakened that il yields
When the Engineer perceives that bis tciler L
low in water. If he Judges that only lew inmates
have passed and thst toe non has not bad time 70
srcw ho,, be plays The pump rapidly 70 I'll L up
Bat il be believes that II has been Ong IA this sItaa
ron. the affair becomes more difficult and some Of
them can tnd nothing better than 70 retreat. and
opening the srst cCck the frs; door or the boiler
which cones 70 hand IL order 70 satisfy their con
sciences, they hasten explosion which might
| have been ayUided il they had kept calm
IL has been observed that II the engine ls At rest
when the water rhus fails, the opening a steam
pipe, puttns tire engine In motion viii occas ioE
| the explosion.
The eject o; this operation IS TO gsin room N the