The Sun.
London, England, 1840-11-11 00:00:00

LITERATURE•

THE CL 0 GEM AKER.
Bentley, London, 1840. S ick'
Sam Slick, the well-known Clockmaker of, -ni s in
%rffle, continues his quaint sayings and dninbc-ver
ithis volume, and is as lively and arousing as spa
Isis
was. The sly shrewdness of his
is decided turn for dry, practical humour, are t 1 or
loped in almost every page, more particular) Y 100 "
admirable story entitled " Behind the
the
which besides its diverting drollery, has Ine - arc
of pointing a useful moral. The embellishmenvitsik.
in excellent keeping with character of the °
CORNISH STEAM-EN- GINES'
character9.eve.
.t.. 11

---
We called the attention--.---
of the public a stlerV rn•
ago to the experiments which had been made in
the
wall upon the Cornish steam-engines employed it! the
mines for the purpose of satisfying the inquiries 01 to
deputation from the Government of Holland a!_or
their efficacy and capability of being advantse°,l3,
employed in the projected plan for draining
cc` 0
Lake of Haarlem. Since that time we cave .114
11 letter addressed to the editor of the IrAll'4ii
Journal by Mr. Thomas Wicksteed, the c'tio
engineer, and published in that journal of ,phib
17th of last month, on the duty performed by C 1 r
one
steam-engines. The letter is a very imports.,","d to
to all persons interested in the branch of seiec the
which it refers, and particularly valuable as he'e"„t• I.
results of the experience and observation of a lira.' ICI
oaOf Idot
hiFse oi
as well as an able theoretic engineer. Mr. Wteltstee r
ndßow,t o
theiretasu o nt hdreoenfil
a:
tsai persontvned from
merits, whohis
as
ei n:timee
rdpi t tea Cor :co;
Cornishtrrhde,
powers
enginene ar engineer
ani of the East London Waterworks'. I
with other engines, is qualified to give an opinion ye
them. 'The letter to which we refer our readers any
t tins a table, setting forth the diameter of the cylinder.', .
and performances of duty of eight engines—viz,,Fore.l
Consols—Austin's ; Wheal Ver—Borlasc's ; Wile;
Darlington ; Charlestown United Mines, ditto Stal,r;'
ing-engine ; Wheal Vor stamping-engine ; the Corooi
engine at the East London Waterworks, designed rts
erected by Mr. W. West, and a Bolton and " •
engine, on the same works, boiler and cylinder,. St, eir
clothed with Boredaile and Whiting's patent leo: .
tahneddpuutmyprsepfiottreteddwaistlpt
eHrfoarrmvecydadnduriWngest's patent 011,..4
the average duty performed during twealy:ix h
th, li,
m on 71:: tt rt 5711,
andtli the aovtehrearg
le) a
rotfi
ecnol
narl
ss
of
fstehde per
yar i
ahtoiounr
ipner horse Pope~
referr ;
formed, &c. Mr. Wicksteed very pro erly saYs,
to the table," An inspection will show how little relia,eo
,',.,
is to be placed on short trials, for in the same L.,61.110,
the variation in duty during twelve months' rt,,,edor
work is very great, and taking the Wheal Vor sta—leif;
,trvrhiiiiii
oins
di tschpi en
important
encaoavrteternsangtael
engine, the duty done during the short trial
w% ho.°'
to
or eihnpefoe
considered,rr teendc
inferences
from
ryo al n forand
short
tome sr et
rl
.:
~,ev
vp
or
crikn
cation
let:chic:f;
has very properly set forth the result of tvrelvc ;tidies:
duty, by an inspection of the table by Whielf,l to P- tist
knowledge and intelligence that can be turne,l4.,es th";
purposes,( can be acquired. This table estat';' of,t";
1 tt contended for, viz., the great superi°Vl„hjpo'
by horth-cy •pe r..
Cornishform
mn i nthueesi engines,
iandteustthe the
E The
a saving
st
h a
ii:eCeonrdnoisnl 1 l
8 engine
nt e
r
Tent, and the admirable manner in whieb,„,hich had
of fuel
steed, and the Company.o'r-ks at °la
VOA'
Ford • IVIr•
was introduced, as was said before, hY it „wing,
experienced from ... , r.,.
collo° •
of about " 40 /verY
-,, 0. a year in coals. This is „feature in tbe
able item, and must make a very pleasin tteMPt
calculation of the dividends. Like all other site spats
improvement, the introduction f Cornigh engine of,
nses
o
London, and the application of them to the purp t
with
raising water for the supply of the metropolis, me eoso
discouragement, if
agement, not with opposition. , ger, p
of the engineer and his perseverance, 13°"- - vso
vailed, and the East London Waterworks ConWeie;inso
indebted to them for the great saving IneseeB not 11
mentioned. The invention of these eng Is se, for ~
novelty ; but for their adaptation to the merit
,_.,
which the one at Old Ford is applied great merit is is us
~,
to Mr. Wickstced. The following extract fromr,
printed paper by that gentleman, published bY ;of
Wcale, High Holborn, on the " Effective P"felanr
the Cornish Steam-engine," will give a further CS!"
Lion of this subject : it fis the
" The principle of expansion is not new ;I$ te
extent to which it has been carried, especially bee
r
years, by the successful adoption of steam tit. aa•
temperature than is used in the common cond Costal'
gine, which is new. ei3..3 for
" The late Mr. Watt took out a patent in .lei shoat
working steam expansively, and in his speelleo44
dated March 12, 1788, lie says,' My new imPrn to jot!
in steam or fire engines consists in admitting at
tain part
the cylinder of the engine only during some eertal and
or portion of the descent or ascent of the Pigt°lh 00130
using the elastic forces wherewith the said steam
eiii,Pe to..
itself in proceeding to occupy larger spaces as the
pars
ing powers on the piston, through'the other p'ts
tions of the length of the stroke of the piston•
sure i!
"He then shows, that if steam of 1410. Pree-rtb of •
admitted into a cylinder, and cut off at one-lan
prof' .
the length of the stroke, at half the stroke I"
cite
sure was reduced to 71b. ;at three-fourths of the s
to 4 2-alb. ; and at the end of the stroke the
org:01
would be reduced to 311 b., or one-fourth of
it, ies
wer He then shows that the sum of all these
inal pow
po • poser
is greater than 57-hundredth parts of the orig4lY,
multiplied by the length of the stroke, and consequethan
that one-fourth the steam thus used produces more. 0
half the effect that four times the quantity would 03
„rnjuced if worked dense through the whole stroecs.
4 .. He then says, ' consequently, the said new Or_ f
pension end: is capable ot' easily ion every
water, whose vs,ii!hts are equal to Mb. on every ,groc i
inch of the area me its piston. by they xpenditur i
only one-tourth the corn:
!tits of the cynder of siesta
at each stroke.'
He had previously shown that the engine working
.
dense steam might be loaded to 101 b.• per square in
v
of the area of the piston.example,l have
.' And lastly, he says,' and though, fig L,iinders
ment.2necl the admission of one-fourth to tHet
any other
full vf stash:, as being the most convenient, yt• "...ril,
proportion of too contents of the cylinder, will ;sl.y '" ~
“ . /09
dtieki Tiitilat effects, and in practice ,1 actually , r
4'l'"
the propeftions as the case requires.'
and stearn-PiP` ,stla
" The casing of the cylinders, boilers,
carried
to ~,,,
is not new either ; but I have never seen it ? sn
the same extent as it is at present in Cornwa11.
et. c
.A,_,
on!
" Great and deserving credA is due to the'
.pne:rs''`a iiiit'''e
once, energy, and ingenuity of the Cornish etngait
it On' ,alls
bringing the expapsive engine to the state h taken ,di
which, althoug ~st
is, and for daily improvements, . ', ,teatet v., -
separately, may appstv ),-iy,il..x,rc,, lil that 1.4
,7 _
r . .
'mit importance/

'". ...._

4,133
ve