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57 in. diam., by 33 in. stroke, which, with a boiler pressure of 60 Ib. indicate
800 h.p.

Gross tonnage, 1,233 tons ; length, 230 ft. ; breadth, 33 ft. ; depth,
22-25 ft.; load draught, 12 -5 ft.

259. Half block model of S.S. "Devonia." (Scale 1: 48.)
Lent by the Barrow Shipbuilding and Engineering Co.,
1877. N. 1479.

This barque-rigged iron screw steamer was built at Barrow-in-Furness
in 1876 for the Atlantic service of the Anchor line. She had two decks and
a spar deck, four tiers of beams, and seven bulkheads.

Her engines were two-stage expansion, with cylinders 59 in. and 107 in.
diam., by 48 in. stroke. Steam was supplied at a pressure of 65 Ib.

Tonnage, 4,500 tons ; length, 400 ft. ; breadth, 42 ft. ; depth, 25 ft.



83

260. Half block model of screw steamer. (Scale 1 : 48.) Wood-
croft Bequest, 1903. N. 1337.

This represents an iron-built cargo steamer with a " well-deck/' an
arrangement that has since been generally abandoned.

Gross register, 1,006 tons ; length, extreme, 216 ft. ; breadth, 28 ft. ;
depth, 18 ft.

261. Half block model of proposed Atlantic steamer. (Scale
1 : 24.) Lent by Messrs. J. and G. Thomson, 1877. N. 1472.

This represents an iron-built passenger and cargo steamer which was to
Ire fitted with engines indicating 4,500 h.p. and driving a single screw.

Gross register, 4,858 tons ; length, 450 ft. ; breadth, 45 ft. ; depth,
moulded, 35 ft.

262. Rigged model of P.Ss. "Brighton" and "Victoria."
(Scale 1 : 48.) Lent by the London, Brighton, and South
Coast Railway Co., 1878. N. 1510.

These schooner-rigged paddle steamers were built of steel at Glasgow
in 1878, for the service between Newhaven and Dieppe.

The engines are inverted two- stage expansion with cylinders 48 in. and
83 in. diam., by 60 in. stroke, giving a speed of 16*8 knots, with a boiler
pressure of 80 Ib.

Gross register, 531 tons ; length, 220 ft. ; breadth, 27 5 ft. ; depth,
moulded, 11 -6 ft.

263. Half block model of P.S. " Violet." (Scale 1 : 48.) Lent
by Messrs. Laird Bros., 1879. N. 1518.

This vessel was built of steel at Birkenhead in 1879, for the Irish mail
service of the London and North "Western Railway Co. The quarter deck
is 99 ft., the bridge deck 90 ft., and the forecastle 96 ft. in length.

The engines had a pair of oscillating cylinders 78 in. diam. by 84 in.
stroke, indicating 3,200 h.p. ; in 1890 they were replaced by a three-stage
expansion set with cylinders 44 in., 70 in. and 108 in. diam. by 78 in. stroke.
New boilers were also fitted.

Gross register, 1,035 tons; length, 300 ft.; breadth, 33*1 ft.; depth,
14-4 ft.

264. Rigged model of S.S. "Arizona." (Scale 1: 48.)
Lent by the Fail-field Shipbuilding and Engineering Co.,
1901. ' N. 2267.

This four-masted, barque-rigged screw steamer was built of iron and
engined at Glasgow in 1879, by Messrs. J. Elder & Co., for the Guion
Steamship Co.'s transatlantic service; she commenced a new era by a record
passage from Queenstown to Sandy Hook of 7 '3 days. In November, 1879,
while travelling at the speed of 14 knots in mid-ocean, she ran into an
iceberg which crushed in her bow for a length of 26 ft. and to a depth of
14 ft. below water-line, but she was effectually protected from foundering by
her collision bulkhead.

The vessel has four decks, the upper and main being continuous and
covered with wood ; the lower deck is only plated amidships, while the
orlop deck extends from the machinery space to each end ; there is also a
bridge 34 ft. long and a forecastle of 74 ft. She is built with a bar keel
12 in. deep and a stem 9 in. by 5 * 5 in. ; there are eleven bulkheads, eight of
which are watertight.

Her original engines were an inverted two-stage expansion set, with one
high-pressure cylinder, 62 in. diam., and two low-pressure cylinders of 90 in.
diam. by 66 in. stroke. Steam at 90 Ib. pressure was supplied by seven
Scotch boilers 13 '5 ft. diam. On trial with an indicated h.p. of 6,357 and
56 revs, per min., she attained a speed of 17 '3 knots.

F 2



84

In 1898 her engines were altered by the Fail-field Company to a three-
stage expansion set, with cylinders 34 '5 in., 56 in., and 92 in. diam., and the
original stroke of 66 in. Steam at 180 Ib. pressure is supplied by three
double and two single-ended boilers, having in all 24 corrugated furnaces, a
grate surface of 468 sq. ft., and a heating surface of 14,578 sq. ft. With
this machinery the same i.h.p. and speed are obtained with a considerably
reduced coal consumption.

Gross register, 5,305 tons; length, 450 -2 ft. ; breadth, 45 '4 ft. ; depth,
35-7 ft.

265. Rigged model oE S.S. " Orient." (Scale 1 : 48.) Lent
by the Orient Steam Navigation Co., 1891. N. 1867,

This four-masted barque-rigged steamer was built of iron at Glasgow
in 1879, for the Australian trade, by Messrs. John Elder & Co. She has
four decks two iron and one partly iron the upper deck being sheathed
with wood ; the double bottom aft is 54 ft., and the midship deep tank 28 ft.
long, both of which could be filled with water ballast ; her bar keel is 12 in.
deep, and she has eight bulkheads.

The engines are two-stage expansion, with one high pressure cylinder
60 in. and two low pressure cylinders 85 in. diarn. by 60 in. stroke,
indicating 5,400 h.p., driving a right-handed, four-bladed propeller
22 ft. diam., and 30 ft. pitch, at 58 to 62 revs, per min. The boss of the
propeller is of annealed cast iron ; the blades are of steel, cast by Messrs.
Yickers, Sons & Co., of Sheffield, and are bent backwards to prevent
vibration. Steam at a pressure of 75 Ib. is supplied by four circular double-
ended boilers, 15 -5 ft. diam. by 17 '25 ft. long, with six furnaces 4 ft. diam.
and 6 ft.Jbng, giving a grate area of 264 sq. ft. The bunkers hold 3,000 tons
of coal, or more than sufficient for the voyage out to Australia by the long
sea route, via the Cape of Good Hope. She can carry 3,600 measurement
tons of 40 cub. ft. of cargo, and has accommodation for 220 saloon,
130 second, and 300 steerage passengers.

Displacement, 9,500 tons ; gross register, 5,365 tons ; length, 445 5 ft. ;
breadth, 46 25 ft. ; depth, 35 08 ft.

266. Whole model of S.S. " Vindobala." (Scale 1 : 96.)
Lent by Messrs. Hepple & Co., 1882. N. 1582.

This schooner-rigged screw steamer was built of iron at Newcastle in
1879. She has one iron deck, and two tiers of beams, five bulkheads, a
bridge deck 96 ft. and forecastle 32 ft. long. Her double bottom aft is
62 ft., forward 72 ft., and under the engine and boiler room 32 ft. long, with
a capacity of 32 tons ; there is also a fore-peak tank of 35 tons, and an
after-peak tank of 40 tons capacity.

Her engines are two-stage expansion with cylinders 33 in. and 62 in.
diam. by 42 in. stroke. The boiler pressure is 80 Ib.

Gross register, 1,744 tons; length, 261 ft.; breadth, 34 -25 ft.; depth,
21-66 ft.

267. Whole model of stern wheel steamer " Inez Clarke."
(Scale 1 : 12.) Presented by Messrs. Yarrow & Co.,
1900. Plate V, No. 2. N. 2256.

This shallow draught steamer and a sister vessel, the " General
Troquilla," were built in 1879 by Messrs. Yarrow & Co. for the United
States of Colombia, to be employed in the mail service on the river
Magdalena. They attained a speed of 15 miles an hour.

They were constructed of galvanised steel plates, from '12 to '19 in. in
thickness, and divided into eighteen watertight compartments ; the engines
are placed aft and act directly on to the paddle-wheel shaft, while, to
distribute the weights, the boiler is at the fore part of the ship. To resist
hogging and generally give longitudinal strength to the structure, two deep
trusses are introduced so as to supply this stiffness with a minimum of
weight ; these also form the supports for the two flying decks, upon which



85

the saloon accommodation is provided. The rods of the trusses have screw
adjustments, by which initial stresses can be applied, for the purpose of
avoiding vibration of the members.

The engines are of the two-stage expansion type, with a high pressure
cylinder, 15 in. diam., on one side, and a low pressure cylinder, of 27 in.
diam., on the other; the stroke of each is 4' 5 ft. Gooch's stationary link
motion is used, and the engines are fitted with a detached surface condenser
of cylindrical form. The air and circulating pumps are driven by an
independent engine.

The boiler is of the locomotive type, with a divided fire-box and large
grates suitable for burning wood ; the two grates are fired alternately, and
forced draught from a fan is delivered into the closed ash-pit. The fan also
assists in ventilating the various saloons, and the fan engine is fitted for
driving a circular saw when required for cutting up the timber used as fuel.
Under ordinary conditions, with 160 Ib. boiler pressure, 250 indicated h.p. is
developed, but there is an arrangement by which boiler steam, lowered to
60 Ib. pressure by a reducing valve, can be directly admitted into the low
pressure cylinder so as to obtain additional power when rapids have to be
ascended. With a draught of 15 in. these vessels have obtained a speed of
over 13 knots. Owing to the very small immersion, three rudders are fitted,
the centre one of which is of the balanced type.

Displacement, light, about 73 tons ; length, 130 ft. ; breadth, 28 ft. ;
draught, 12 in. ; draught with a load of 90 tons, 24 in.

268. Rigged model of S.S. " Athenian." (Scale 1 : 48.)
Lent by the Union Steam Ship Co., 1897. N. 2154.

This three-masted, schooner-rigged steamer was built of iron at Glasgow
in 1881 by Messrs. Aitken and Mansel, for the South African service. She
has three decks, eight bulkheads, a bridge deck 102 ft. long, forecastle 42 ft.,
and a water ballast capacity of 370 tons in a cellular double bottom
220 ft. long.

Her engines were altered in 1886 to a three-stage expansion set, with
cylinders 36 in., 58 in., and 94 in. diameter, by 54 in. stroke. Steam at
160 Ib. pressure is supplied by three double-ended steel boilers, with 18
corrugated furnaces.

Gross register, 3,882 tons; length, 365 ft.; breadth, 45 -8 ft.; depth
of hold, 29 ft.

269. Half block model of S.S. " Austral." (Scale 1 : 48.)
Lent by the Orient Steam Navigation Co., 1882. N. 1574.

This screw steamer was built at Glasgow in 1881, for the Australian
trade, by Messrs. John Elder & Co. She has four masts, schooner-rigged,
and a sail area of 28,000 sq. ft. The bottom is double, with 19 water-
tight compartments, and there are 13 watertight bulkheads in her hull.
She is built of mild steel, and has a total water ballast capacity of 1,000
i-ons. She has been built to suit the requirements of the Admiralty for a
war cruiser, and is specially strengthened to carry guns.

The engines are two-stage expansion, with one cylinder of 63 in., and
two of 86 in. diam., by 60 in. stroke. Steam is supplied at a pressure of
D5 Ib. by four double-ended steel boilers, 16 ft. diam. and 17 ft. long, with
six furnaces in each, and a total grate area of 688 sq. ft. She indicated
7,114 h.p., giving a speed of 17 '3 knots, and the coal consumed was at the
rate of 1 3 Ib. per indicated h.p. per hour. She could steam from England
to Australia at her full speed without re-coaling or interference with her
ordinary cargo and passengers.

In November 1882, the " Austral " sank in Sydney Harbour in 50 ft. of
water ; the ports had been left open, and the vessel filled owing to a heavy
list due to unequal coaling. She was raised in March, 1883, and soon
restored to her original condition. (See photographs, N. 1820, presented by
Sir Herbert Sandford, 1888.)

Displacement at load line, 9,500 tons ; gross register, 5,524 tons ; length,
455 ft. ; breadth, 48 -25 ft. ; depth, 37 ft.



86

270. Rigged model of S.S. "Servia." (Scale 1 : 48.) Lent
by the Cunard Steamship Co., Ltd., 1907. N. 2437.

This barque-rigged steel steamer was built and engined at Glasgow in.
1881-2 by Messrs. J. and G. Thomson for the Cunard Co.'s Liverpool and
New York service. She was the largest vessel afloat at that date, with
the exception of the " Great Eastern"; she was also the first cargo vessel
constructed throughout of Siemens mild steel and the first Cunarder to-
be lighted electrically. Her record Atlantic passage was 7 days 1 hour
38 mins.

The lower portions of the ship were framed on the cellular system,,
combined with a centre-through-plate keel which was built up in five-
thicknesses and hydraulically riveted. The main hull was sub-divided by
twelve watertight bulkheads, eight of which were extended to the main
deck. Orlop, lower, main, and upper decks were fitted in addition to a
promenade deck for passengers.

In a steel-protected steering house at the stern, provision was made foi~
four separate methods of steering : (i) A steam gear ; (ii) A hand screw
gear ; (iii) A hand double -purchase chain gear ; (iv) Tackles acting directly
on a large horizontal wheel instead of the usual quadrant attached to the
rudder head. Cunningham's patent self -reefing sail gear was fitted to the
fore and main topsail yards. Accommodation was provided for 500 to
600 first-class passengers and about 700 others.

The vessel was propelled by two-stage expansion engines having a high
pressure cylinder 72 in. diam. and two low pressure cylinders each 100 in.,
diam. with a common stroke of 78 in. Steam was supplied by seven boilers,,
six of which were double-ended with six furnaces each and one single- ended
with three furnaces, the whole 39 furnaces being constructed with Fox's
corrugated flues. On light draught trials, with steam at 90 Ib. per sq. in.,
and engines indicating 10,300 h.p. she realised a speed of 17 '8 knots.

The " Servia " was included in the Admiralty list of auxiliary cruisers
and could under war conditions carry sufficient coal to steam 16,400 miles
at her normal full speed, i.e., 16* 7 knots.

Displacement, 12,300 tons ; gross register, 7,392 tons ; length (overall),.
540 ft. ; breadth, 52-1 ft. ; depth, 37 ft. ; draught (mean), 26 ft.

271. Whole model of S.S. " City of Rome." (Scale 1 : 96.)
Lent by the Barrow Shipbuilding and Engineering Co. r
1882. N. 1580.

This four-masted, schooner-rigged screw steamer was built of iron at
Barrow in 1882 for the Anchor Line of Atlantic steamships.

She has four decks (three of iron) and is divided by ten bulkheads ; the
double bottom is 107 ft. long, with a capacity of 376 tons ; the coal bunkers-
are along the sides of the ship and form part of the structure.

The engines are two- stage expansion, inverted tandem, with three pairs
of cylinders 43 in. and 86 in. diam., by 72 in. stroke, indicating 11,890 h.p.

Steam at 90 Ib. pressure is supplied by eight steel boilers, 19 ft. long by
14 ft. diam., giving a grate area of 1,398 sq. ft., and 29,286 sq. ft. of
heating surface. The propeller is 24 ft. diam., and the speed on trial was
18 -23 knots.

Displacement, 11,230 tons ; gross tonnage, 8,141 tons ; length, 560 ft. ^
breadth, 52 25 ft. ; depth, 37 ft.

272. Half block model of proposed Atlantic steamer. (Scale-
1 : 64.) Lent by Messrs. McMillan and Son, 1882.

N. 1584.

This half block model represents a design for a large twin-screw steamer
for the Atlantic service.

The hull was to be divided into 44, and the double-bottom into 22 water-
tight compartments, with a water-ballast capacity of 1,800 tons.



87

Two distinct sets of engines, each of the 4- cylinder inverted three -stage
expansion type, with one cylinder 44 in., one of 66 in., and two of 100 in.
diam. by 72 in. stroke were provided for. These were estimated to indicate
20,000 h.p. at 59 revs, per ruin., and to give the vessel a speed of 20 knots
on a 23 ft. draught. The propellers were to be 22 ft. diam. and 35 ft.
pitch. Steam at 125 Ib. .pressure was to be supplied by twelve steel
boilers with six furnaces in each. The accommodation would be for
1,134 passengers with a ship's company of 300, or else for 4,000 troops.

The details of the proposed vessel are : Displacement at 26 ft. draught,
19,835 tons ; weight of vessel complete for sea, 12,500 tons ; dead weight
capacity at 26 ft. draught, 7,335 tons ; tonnage, gross, 10,000 tons ; length,
600 ft. ; breadth, 70 ft. ; depth, 39 feet ; immersed midship section, lad^n,
1,537 sq. ft. ; wetted surface, laden, 52,207 sq. ft.

273. Half block model of P.S. "Barrow Express." (Scale
1 : 48.) Lent by the Barrow Shipbuilding and Engineering
Co., 1882. N. 1581.

This vessel was designed in 1881-2 for a high speed service between
Barrow-in-Furness and Douglas, Isle of Man.

The engines were to be two two-stage expansion sets, with oscillating
cylinders, 50 in. and 88 in. diam., by 72 in. stroke, indicating 5,000 h.p.
Steam at 85 Ib. pressure was to be supplied by four doubled-ended steel
boilers. The feathering float wheels were to be 24 ft. diam., and to have
each ten steel floats.

Register, 1,595 tons; length, 320 ft.; breadth, 38 -25 ft.; depth,
14 -42 ft.

In 1885 the paddle steamer " Mona's Queen " was built of steel on this
design.

274. Rigged model of P.S. "Ho-Nam." (Scale 1 : 48.) Lent
by Messrs. A. and J. Inglis, 1891. N. 1865.

This schooner-rigged paddle steamer was built of steel at Glasgow in
1882, for the conveyance of passengers and cargo, principally between Hong
Kong and Canton. There are three decks 9 ft. apart, the lower one of which
is of steel, for cargo, while the two above it are of wood. The sponsons,
supported in the usual way by beams and stays, are carried entirely round
the ship.

The engines are two-stage expansion of the overhead beam type, with
cylinders 40 in. and 72 in. diam., by 120 in. stroke, and at 33 revs, per min.,
indicate 2,900 h.p., and give a speed of 16 25 knots. The beam is 23 ft.
long, 11 ft. deep, and weighs 14 tons, while the connecting rod is 23 ft. long.
The surface condenser, of 5,395 sq. ft. area, is placed alongside the cylinders,
while the pumps are worked by a rod from the beam.

Steam at 75 Ib. pressure is supplied by three double-ended steel boilers,
placed athwartships, and fired from the wings. They are 14 ft. diam., 14 ft.
long, and have in all 18 furnaces, giving a grate area of 297 sq. ft., and a
heating surface of 7,939 sq. ft.

The paddle-wheels are 21 ft. diam., and are built entirely of steel, with
feathering floats 15 ft. by 4 ft.

Gross register, 2,364 tons; length, 270 feet; breadth, 38 ft.; depth,
13 -25 ft.

275. Rigged model of KM. telegraph S.S. " Monarch." (Scale
1 : 48.) Lent by W. R. Culley, Esq., 1885. N. 1691.

This schooner-rigged iron screw steamer was built at Port Glasgow
in 1883, for the Telegraph Department of the Post Office. She was designed
for laying and repairing submarine cables, is double-bottomed, and has
three cable tanks. There are cable sheaves at the bow and stern, for picking
up or laying, and she is capable of carrying fuel and other stores sufficient
for six weeks' work.



88

The engines are two-stage expansion, with inverted cylinders 30 in. and
50 in. diam. by 48 in. stroke, indicating 1,040 h.p., and driving a single
propeller. The boiler pressure is 80 Ib.

Displacement at 16 ft. draught, 2,135 tons ; gross register, 1,122 tons ;
length, 240 ft. ; breadth, 33 ft. ; moulded depth, 20 ft.

276. Rigged model of S.S. " Clan Macarthur." (Scale 1 : 48.)
Lent by Messrs. Cayzer, Irvine & Co., 1888. N. 1808.

This schooner-rigged screw steamer was built of steel at Greenock in
1883 for cargo and passenger traffic to the East. She has three steel decks,
the upper sheathed with wood ; the bridge deck is 144 ft. and the forecastle
48 ft. long.

Her engines were two-stage expansion, with cylinders 48 in. and 86 in.
diam., by 60 in. stroke, and indicated 2,376 h.p. Steam was supplied by
two boilers, having twelve corrugated furnaces.

In 1893 the engines were altered to three-stage expansion, with cylinders
30-5 in., 48 in., and 82 in. diam,, with a stroke of 60 in. Steam at 160 Ib.
pressure is supplied under forced draught by two single -ended steel boilers,
with eight ribbed furnaces, a grate area of 160 sq. ft., and 6,411 sq. ft. of
heating surface.

Gross register, 3,994 tons; length, 382 ft,; breadth, 44 ft.; depth,
28ft.

277. Rigged model of S.S. " City of Chicago." (Scale 1 : 48.)
Lent by the Inman and International Steamship Co., 1887.

N. 1728.

This four-masted, barque-rigged steamer was built of iron at Glasgow
in 1883 by Messrs. C. Connell & Co,, for the Atlantic service. She had
four decks, two of which were iron, and seven bulkheads.

The engines were two -stage expansion with one cylinder 56 in. and two
of 80 in. diam., with a stroke of 60 in., indicating 5,000 h.p., and driving a
single screw. Steam at 90 Ib. pressure was supplied by four double-ended
and two single-ended steel boilers, having a total of 30 furnaces.

Gross register, 5,202 tons ; length, 430 ft. ; breadth, 45 ft. ; depth,
33 -5 ft.

278. Whole model of telegraph S.S. "Britannia." (Scale
1 : 48.) Lent by the Telegraph Construction and Mainte-
nance Co, 1892. N. 2007.

This twin-screw, schooner-rigged steamer was built of steel at Birken-
head in 1885, by Messrs. Laird Bros., and was specially constructed for
laying and repairing submarine telegraph cables. She has five watertight
bulkheads, and a double bottom forward, 64 ft. in length, with a water
ballast capacity of 205 tons, while there is a deep tank aft, 40 ft. long, with
a capacity of 112 tons.

She is propelled by two sets of two-stage expansion engines, with
cylinders 26 in. and 45 in. diam., by 30 in. stroke, which, with a boiler
pressure of 75 Ib., together indicate 1,350 h.p., and give a speed of 12 knots.

The apparatus for laying the cable is shown on the after part of the
model, whilst the picking-up gear is placed forward.

Gross legister, 1,525 tons; length, 247 2 ft. ; breadth, 34 -3 ft.; depth,
17 -4 ft.

279. Whole model and drawings of S.Ss. " Crocus " and
" Snowdrop." (Scale 1 : 48.) Lent by Messrs. Flannery
and Fawcus, 1885. N. 1678.

These Mersey river ferry boats were built at Preston in 1885 by Messrs.
W. Allsup and Sons, from designs by Messrs. Flannery and Fawcus, for the



89

service between Liverpool and Wallasey. They are both constructed of mild
steel throughout, and are divided into 18 watertight compartments ; both
ends are alike, so that they can go ahead or astern with equal ease.

They have each two complete sets of two- stage expansion engines, with
inverted cylinders of 18 in. and 37 in. diam., by 24 in. stroke. Two steel
boilers supply steam at 100 Ib. pressure, They are fitted with twin-screws
at each end, and their speed on trial was II knots.

With the model is a coloured sectional drawing of the " Crocus."
Tonnage (b.m.), 731'5 tons; length, 130 ft.; breadth, 35 ft.; depth,
11 -42 ft.

280. Whole model of a ferry steamer. (Scale 1 : 48.) Lent
by Messrs. William Simons & Co., 1894. N. 2036.

This shows an arrangement of ferry steamer with a raising and lowering
deck, which can be maintained at the quay level whatever the state of the
tide, thus facilitating the taking on board of passengers and vehicles.

The movable deck is carried between 16 square vertical guides,
arranged in pairs. Between each pair is a sliding frame, fixed to the deck
and having in the centre a nut through which a square-threaded screw
passes. There are eight of these screws, and they are all turned simul-
taneously by an engine placed below the main deck and connected with the
screws by worm gearing. The screws are supported by collars carried by
bearings at the top of the guides, and so become adjustable suspension rods
instead of columns.

The boat is flat-bottomed, to diminish the draught, and this example is
propelled by paddle-wheels. The boat is designed to carry 2,000 passengers,
and 20 horse vehicles.

Length, 170 ft. ; breadth, 52 ft. depth, 11 ft.

281. Whole model of P.S. " Orlando." (Scale 1 : 24.) Lent
by Messrs. Sir W. G. Armstrong, Mitchell & Co., 1887.

N. 1725.

This river passenger steamer was built on the Tyne in 1885, for service
on the Thames between Greenwich and Battersea. It differs from the
earlier " penny boats " in having large and well lighted saloons aft and
forward, also in having the engines controlled from the deck, under the
bridge.

The engine is two- stage expansion with inclined cylinders 15 in. and
30 in. diam., by 24 in. stroke ; steam at 100 Ib. pressure is supplied by a
cylindrical return- tube boiler with two furnaces. When driving the paddle-
wheels at 44 revs, per min. the indicated h.p. was 100, the speed 10 knots,
and the coal consumption about 1 25 tons in 12 hours. The wheels are



Online LibraryScience Museum (Great Britain)Catalogue of the naval and marine engineering collection in the ... museum .. → online text (page 12 of 58)