Star.
London, England, 1817-07-29 00:00:00

ollich might be zustlenly let loose or asengag.:l
would have power sufficient to raise the eeck of the
vessel, or to injure the panic, on board.
Supposing an engine upon .be high pressure pen-
ciple to have its boiler • ..ide of wr...i,yht iron, with
the furnace parsing through water throughout its
whole length, and the boiler to be provided tr:th
safety valves properly adjusted, so as to pi .= on! ~he
steam being raked to more than half of tha • ,re
which the boiler is calculated to sustain, shoi,i
then have any apprehension of ill effects aristn,r fr rn
the use of such on.en7,ine ?—Cert• ly, I shoula sod
consider them haz trcions and liable to %try fatal eon.
sequences ; for all boi!ers deteriorate by wiirlc,
time, and by oxydation ; and what might he p• at
this period, at a Invite period th:r magi •• n.
capable of sustainiug ; betides ail !?oil,rs r. t)
casualties, and ia c :se et ;toy c.. 1, •.;ht
suddenly let lease or diceng.ge do o.earic :h
yre:sure boiler, the ste?ro itself would
expansive fince and impacts to destroy ar •
1 have known instances, as I have .t ••r•
low ressi:re engines bursting, t'., 41;re,i. •
no injury ; but I cannot conceive i, tsgt Te r
s.eantot !Gin 2.1 times greater torte c.. e
into tile engine room with‘iiit creating coi•
What k the average prt..• of steam on .
led to convey passrog,rs The Ric: r
yac:•t cost, in the lit.' instance, ii,..,u•ting • e,
Xtb,;o, the engine its. It cost about . .e
i.:stic cost about 42000, and the eni:n.• .:gout
+E'litlu mote. Tile Thames c• st ,€2sot:, i.ciuding
the iae at £l2OO. The new voice ilia, I tuft to
go toliicianond, the boil and joiners' atia:: cost
sE7SQ, and an engine of 11 horses power and appal.
tus c. st 41173. The new Gravesend steam yacht,
Cleo hull only has cost £750, and the engine rtlST'i;
but there will be various other expenses bAtire theie
vessels are finish's/.

Can yoti tall what it the czpense ,fthe bail- alone?
I have just got a new boiler tar the Thames steam-
y.ttlit, and 1 pay tor the built:. at." 315.
What additional expense du you apprel.end is in-
clined in a boiler these donentirna. by Iti:ving it
of wrought iron, layond what it would cost if uJe
u( cast metal ?—Never having had any cast iron ly
lets, I do not feel toyb:11 competent to give a sail;.
factory answer.

Wha- t additional expense would be incurred by
the addition of an additional safety valve
won:a depend upon the dirrieniions of the suety
valve; but in general, the additional erpenbe would
tx under .4F.

You mean, that each safety valve costs about that
sum ?—The most costly of them cost ahniit that sum.
D:d you ever apply a inc.:curial tube as a sataty
valve ?—Never; 1 have.to each of t!.c boilers a mer-
curial barometer, that operates as an indic Mat of 0:5
bright and pressure of the steam.
Whereabouts :5 the expense of that barometer
I do not recoll-ct, but certainly not mine tl
Did you see the Norwich steam packet which e:-
ploded ?—I have b:eri on hoa:d he:, and pertotme3
a voyage with her ; I went down with Vit W pu:-
chasing it ; I went down for that purposd twice.
What was your reason tor not purchasing it.--Re-
cause it was a high pressure cogine, and 'calle to the
accident which has since occurttd.

Was that your sole Fe4SON l--Yes ; I went 71 tcc"ni
time with a party of German gentlemen from B.
men, who were anxious to make an Immediate
chase of a steam vessel, and they also dec.inecl ui
purchase that or any of the boats op•m the rive:
'Vary, s,lely because they had high pressure mar -
engines on board.