The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1864-04-28

not the entire tor or that boiler have
ssovs ths ,odIcs.os Of s0.roans tina: there vas az
TIE ss:, spss'.sf A. s.a 4 the aperture through
whph the super heated sss~ ss. cd because the time
that the engine had been ruu0loG Nit an. g.,
through the iron she'll and 70 win ss1 sEss> zoe A.
mospoeric space beneath the lesd whssh - sss> =.
S SSn ooooaosos su, am sinoe informed ey scsss
noe court that he sxamined elsewhere, and scsnd
soorched felt 10 other places.
Doss no. felt scorch very easily snd with ordinary
Impossible 70 sooroh tsN al 2ss Fahrenheit; i
= y common. however. 70 sooroh felt on the
heating apparatus and when The rim gets hot
On ne asde OF the steam saturated steam q thirty
gses hot /. takes sx hundred 70 melt lead and sup.
pose very near that 10 burn felt
msasy me wssr ana @ n"r
70 prevent burning or the melting Of ssr A. Tho esA
Sns down BY tho superhestsd steam which comes inst
superhcated steam YET Of hot 10 boz blast furnace
win cat piece OF lead instantly. and that Is tho
perasure this edge OF The lead which the
steam had blown 10 cut down koe edge. whereas IL
thicknos and b ragged heat The he'd
an edge Just as peco Of candy Is melted 70 IN edge Ia
VIII not all the facts apply 70 wood Is well as to
leeds A. No, sir the heat which Will melt lead WIN NOT
20 are 70 OK but steam has bees supsrheasa BY
oanuoS be dooe steam boiler because the heat requ
site for that would be 90 great on she iron uncovered
oan DO done IN an apparatus on purpose; stick o.
wood used 70 stir melted lead without charrtug u, and
mercurySo tbas requires the least heat OF any metal
TO melt ~ the specific heat Of iesd hroe hundred and
the specific heat Of three hundred and thirty
three ten hundreth parts Of water wood requires
rs as g
@ On what basis did you mako your calculations that
these thirty two Tugs would bear pressure Of
those Tugs Ave eghths Of square inch Of IRON the
Ulster iron or that lug Is warranted 70 bear $4,000
$1,000 and 900 pounds taking Il 81 81 900 for rup
ture, these Tugs would bear $1,000 pounds rupsure
Jugs sixty SKI 70 70 tho noa that would
be 900, or thrsytwo Tugs at 50 900 pounds assumed
The e s
;aoosa ., .ess; seventy a1s pounds: s:; Tho
cause whom you begin 70 lengthen out these
braces and take tho springs ont Of the half moon
and second, you have got the top down like drum
head inside Of four supporting arches and reques
out: but, as plain strain il was about seventy.avo
pounds when you akc the half distance around the edge
seventy.nve pounds Of saturated steam in 81.
Q. II this boiler throws It's water out through the
tubes a. rapidly p acting almost Is squirt
the engine why will not this same operation saturato
saperheated steam and prevent the cause Of ex.
tubular boilers will permit the water 70 get lower than
the boxsheet 10 the tube box with safety and during that
time. . Mr.. Kellogg has correctly said II will lit the
water that box and will mako II seem 1t the gauges
as Il there were really solid water there; that ope alton
10 Demphells water tubular boilers Is 30 violent that
they have put plato the top OF the tube TO keep
any water 10 the boilers; but the limit to that
operation e when the wa.s, gets very low, and up
tubes the struggle between that tendency and the
diminished supply Of water went on: meanwhile the
gauge would be indicating water at times, aud the
engine would be getting drer steam continually, until
anaiy the water ID too low for that operation,
aud then point OF danger has arrived at that time
the throttle be opened and the demand increased the
water low to rise under the demand, must
up under the greater and the explosion that
this quality up to certain point is element OF safety
against careesness B also the means Of deceiving the
Of the gauges as TO the quantity Of water IN the
boiler.
Mr. John Aaxson residing at o. Gold street, testified
10 being boiler maker and 10 the employ OF the govern
In the Navy Yard. He testified 70 the bracing and
staying the boilers Of the Chenango He occupied the
witness stand previous 10 Mr. Dckersou.
Adjourned till this afternoon as three o'clock, when Mr.
Dickerson will resume bis evidence.