VESSEL 
TABLE 4.—RESULTS OF THD TRIALS OF H.M,s SCREW SHIPS, OFFICIALLY TABULATED BY THE ADMIRALTY IN 1850, 
PROPELLE! 
RAIIO OL 
by the spurew heels is 0 
padidlenw 
dt boarding an enewy's 
her clear of obetrs 
par (0 stale, that the operati 
ily as tbe common paddle. wheel 
Wee have the boaour Us ba, BU, 9 
this view the Malller was ordered 
Letween twa vessels could take It. 60. 4) 
Tengthened fur the insertion 0 1 
previonly (ried in paddie-w het 
Ther i Use Baler U 
jtireeal mancer 
aod filed with engines of the a 
1 wus Goad enim, and the 6 
the Areliimades and lar engine as nat a 
nln iNew 
at of propolslon Is 
ded, Ib 
Land's dad, 
a eA vensels wet the whole of their valle tb 
has the The rus was as ‘before, from Dover 1) Calsla,19 Fallen 
7 to 2%, and ler vperd Live 9 Uo $f kot “Arebimedes ran tbe Gistanee 1a 
salle set, Arvhimaties en 
2, and speed 10 knots, abe tnd sea fa heavy 
io this respect han yet boca afforded for in 
- bly taferioe Lo that of the Whigeum In light aire winds, by oaly eceasion on which te sy 
Tor sore the rain ey Per bi a My oan 
at 18 Clene vesaris the propelling perwer of Ue screw le rou) oat riortty, sllete Spe wrathes the oa 
Gan wetcanry pater fa the vewpect, Coe 
It bn xiao plain, (roms te secomh trish that Ji U 
ot Son Witz © ber ae atvanlane over 
$0 Be ‘The iattier was wext tried agalnet the Vervrius tn 
secu. « decided superiority over the paddle-wherl 
ad sDeg her competitor. liefore joining the #quadran un 
1d althoragh the : i Mefore Joining th Aron un 
failed What ta strony. 
61. wlhono pOWUr, Ke compared 
tras empoyed a tow the Sree abd Terror to he Orkcer nang aa 
[aiistueliog of hie Sohn Prank. thfore this time hemwezer fle state 
{or the instrveta of the ofbears of the tioyal Nava) Colege, U 
Archimedes, a #he hour having tern reallacd, and the Vairy built fur the use of ‘Nine 
to Calais io 2 boure 1 wuinate, pean a eomparaisvely Rign role of pent ornid be obtaibed, yet they could scarcely be re 
Fes Be pei et enacting tn el tr wes sh St pin Se ha hep sesh oan Ba el Hi hn 
ed ov ig toe ccenanmy Rory Ae po 
for discon pected wilh 
(ibe Toelluation of the sup does not di 
a of the screw facilitates the 
It ls obvious that in the Widgeon and Archimedes, whieh differed material 
parison could not be made between the p OF the serew abd that of th 
arly sluwed, eapectally when the pecallr Gtness of the screw tor wor purp 
nd, that the experiment mig 
ructed oo the sare in 
October, 162, to the beginning of 14 
els {0 Cilils Sosihd, Se'm perfoet ealin, wiib the sca atthe serew tig lt be adiyaatageoualy redured from lwo half Karns to about one-Lllrd 
strokes Yar ilnute, and Ler speed was from tov huts per hour, The the weight, farlitated the yperation of shipping ‘ 
: iinvwcen, aad the whole tne oceupled by the tuiter un Mer part of the veaacl. Tetfore this I 
men aliowe 
th 
Mh ber 
der the eattrpand of test: Admiral 1 
a iivinte ti 
to their lordahips 
his slleraton, we abstain from giving aay 
(hal the valoe of 3, Bmith'« tnvention will 
cent, even it it 
common paddie-mbeel. A 
teasel oF as bot, Ir 
‘and io aby we 
lah the prupeling, power of th 
the sbips lying elose 
neat obedient Rervant 
The Secrelary of We Admirstly Pit, ist SarrER 
both ia site and form, an exact com 
le 
that thes 
y be experienced. Tn 
bot be orereom 
ipaddte- 
sve} would 4 
jecring, and accompliaber the 
was taken Loto evoaideration, th 
be eooclusive, ao far an a trial 
fue the Aleelo, the after-part. belbg 
power, and oo & plan which had been 
nd from them it 
itwas 
I thferior ta the 
Vietoria aod 
ie and showed In respect of 
eater than that ot 
af the experi 
y shows 
1. LLOYD. 
ait of the trials 
clearly 
heady ind, 
he 
1a mile 
fat 
“data om whieh 
fan taatp wection havin 
6 bee 
Inarive cojiovers {nthe Country were therefore ealed on to propose that coustruetion and arrangement of engine which Se that of auy of the vessels then ip pro 
they mgt wverally think the bert adapted the dimensions of the propeller, and thesumter ofrevolutions (t wauld b ty this alteration, unequivocally show 
ojuired to make, bring furaisbed for tele uldanee, and the ueceaaity of keeping the whole of the machlaery below tbe Eyoutruction, excopt those reader 0 
water line being’ Insiat Beyond these necessary conditions the manufarturecs were left unfettered, hd they, as roved in the form of thelr 
Tigh be expected, seluig new and wide feld open for thelr exertions, submatted a (reat variety of dealguy the reault The great lmportanes, or rather tho nocesalty, of futroduri 
Of thireveal expefienee and meeanleal abllty atloned in tho mn whieh a high speed in regarded 
These Veakgua difered widely from one abot lier xome wero with and some without gearing, and many of them appeared alsa (udlspensabla, fr without it the objet of bi 
to pmacns real merit. OF these, selections were made, giviog to Wearly alt the m d,s aultable form, although nok, as in the farm 
fearrying Inlo effeet une at le 
{wo rimines of the same deserip 
‘experience Nad 
the tuggestoa of the Harbour fomunlaslon, eight pairs for w tatuming double the quantity of feck and to 
belugse-of- battleships and foar frigates. The good performance o fvealtored thelr originnt tnd coals’ and reductog by oe-balf the apace whieh they cceupy a 
destloation from mero Goating batterios to seagoing ships, calculated {0 serve. Wi «la conjunction with ulated 10 produce seriou inconyen) 
fleet. Of the frigate bicek ships, ono only out of the four has been. ordered to be fitted, and wilh «mallcr engines than number of days. Probably sueh cai 
thom originally lotended for her. Shu bs 
iu order stilt further 
fewas lille differeuce ef speed 
taal experline 
‘The expenditure 
anid 0 
by mont of the manufactorers 
alBelent experience hax 
ould bo adopted, but 
stron 
‘Ore screw vou 
Ainuer the varying Yeloeiy of 
Dower. if for exaimp 
out by the eu 
mee the 
of appleatioo, thero tring a What Aime no kind of engine wih would effectually answer the purrowe All th emacot 
‘the plans whieh they severally: props 
A acquired {a this novel application 
Tithe year to tenilere werw accepted fue fftexn. pairs of wcrvw engincs for 
tu opportunity of tying the Yen's head fo wiad ia heavy Weather, 
| was much greater in the Niger th 
I the bollérs and engines, and 
been made or the 
Of all certainly, bono of them can be regarded i failures ; Hl tbe pecuniary lo 
bability thal gearing 
Increasing: ‘balk and weight. of tbe m 
Aan iii 
however, whlel 
hy fruntarounly 
some private ve Fvantageous! 
el cecanloned the malls rateot ia coafunetion with stearic pointing oat 
riya vuole gl with aca 
Voy byes have already bev exten 
requirements, 
‘out by attaching ina tem 
‘ve of greater mportas 
than ts perb 
pa com 
from 0 Kt 
ary any alterat 
before the aerew apertun 
forms calculated to 
Totely nceesasry for obtaining the required ypeed, 1 
3, by 2 cansiderst 
Yo render her after-tody aa full 
eto teas (hag 4 knots caused 
dnd all ‘the vessels then in course of 
B, were (0 a greater oF less exicat 
1 the actlon of the serew, eanpot U 
‘evident Ubat Io nuch cases a proper 
(Teren when a moderate spe! ou 
fhe great wante of power 
2 deetaion which secme (o Hava been judicious, whea It fe borao tn talnd tbat Wie evils oceauloued by the advollon of the coat UF forgunmple akin, witch If of the proper 
{applsatoa oftizaa-powen zane aN foro, would be propelled at 7} Kool ls propelled ak 6 Kuots aly, akout one-half Of tho engioe power le thrown awa 
thue wasting half the original cost of 
aratlve value of the screw, 
er, nod to be fitted with engines of the sare power, Th 
Way bo ahorily stated. In flue weather, whe equal engine power W 
wheo vantake was in favour of (he a 
 uunportant point whieh hitherto remain 
Ale-wheel vearel, the B 
{Heae of the views thus carried out 
"The following table contains some parvealars 
of the alterations which from tine to twe have b 
will be aren that the serew engines ordered frou 
ing lustrameale relat 
oe gresicr or leas degree may wopelie, as adapted teach of them 
Pact eae Prhre formule by whieh the ealealations aro 
ae the square of ter ve 
trom the dilfer 
as, Kinda of servw engi 
inxloty folt by all, ex be full 
fh neautted for the 
eof & Ko 
ng alr pumps, &¢., Dears = const 
ot fan auxiliary. 
scarcely necensari 
Somernd Hove, Mop 1830, 
ing. the ailvantace of dls 
Throwing away” the capability of eareyiok 
jrations "ax these’ induced the Boant fo one 
pleted. Neueis torte improved, with « view of Insuring advantages which were Heltbrr doubtful nor of auall m 
Sppeared to outweigh the expense of maklog the neeeasary alteraloas 
of all tie nerow cogincs 
matte ta thel 
is 
Tito tn ets fo Sor Puanaees of Toveaigator tad Keaarehy Tt 
di ruallioy bot this: dlsdradilaga irdee trax the ithe numbers lo tho last column cf (he table, and Iu the column next Dut one preceding 
{a che Daailak, vat thie Glenda redo excellence {8 respect of speed, of the forus of the yarlogs sbips, conjolntly with the'relaive efile 
‘sad bollers Wearing 
at experieuce clearly f 
ich have been ond 
Pot the reault thereby p 
10 that the realaLance of 
carcent expense of 
weight of 
including Erebus a5} 
ri, show approximately the 
"S vy of the 
the cube t 
pe in, orerrOMINE 
cement None of tees 
‘are ot ao far from the 
Tetmeen the performances 
wEtaen cf double Ube power, a 
usaf ber afterbedy 
— —=—s 
