There have been a vast number of designs of steam boiler, particularly towards the end of the 19th century when the technology was evolving rapidly. A great many of these took the names of their originators or primary manufacturers, rather than a more descriptive name. Some large manufacturers also made boilers of several types. Accordingly it is difficult to identify their technical aspects from merely their name. This list presents these known, notable names and a brief description of their main characteristics.

A

Definitions

Points of Interest

Admiralty three-drum boiler: the Royal Navy Royal Navy The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service... 's standardised pattern of three-drum boiler. annular fire-tube boiler: a vertical fire-tube boiler Fire-tube boiler A fire-tube boiler is a type of boiler in which hot gases from a fire pass through one or more tubes running through a sealed container of water...  with the tubes arranged radially, such as the Robertson. annular water-tube boiler: a vertical water-tube boiler Water-tube boiler A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes...  with the tubes arranged radially, such as the Straker with horizontal tubes, or near-vertically and conically as used by Thornycroft Thornycroft Thornycroft was a United Kingdom-based vehicle manufacturer which built coaches, buses, and trucks from 1896 until 1977.-History:Thornycroft started out with steam vans and lorries. John Isaac Thornycroft, the naval engineer, built his first steam lorry in 1896...  for steam wagon Steam wagon A steam wagon is a steam-powered road vehicle for carrying freight. It was the earliest form of lorry and came in two basic forms: overtype and undertype – the distinction being the position of the engine relative to the boiler... s. : An auxiliary boiler, on a steam ship, supplies steam that is not used for main propulsion, but is necessary for some part of the essential machinery. See also donkey boiler. A small boiler may be used as an auxiliary boiler when at sea, or a donkey boiler in port. A composite auxiliary boiler does this, using waste heat from the main engines when at sea, or is separately fired when acting as a donkey boiler.

B

Definitions

Points of Interest

Babcock-Johnson boiler: early production Johnson boilers operating at high pressures (850psi) and with water-wall ends to their furnace. Babcock & Wilcox boiler Babcock & Wilcox marine boiler Belleville boiler: an early marine water-tube boiler. Benson boiler: a monotube "once-through" steam generator Steam generator (boiler) A steam generator is a form of low water-content boiler, similar to a flash steam boiler. The usual construction is as a spiral coil of water-tube, arranged as a single, or monotube, coil. Circulation is once-through and pumped under pressure, as a forced-circulation boiler... . Blake boiler Blechynden boiler: An early naval water-tube boiler. Bolsover Express boiler box boiler: An early marine boiler with flat sides. Owing to the flat sides, even with extensive rod stays, the boilers were only suitable for low pressures. These boilers were physically large and contained a few large flues, each heated by its own furnace. The flues were round, rectangular or arched and usually long and labyrinthine. Brotan boiler: a rarely used boiler for steam locomotives that combined a conventional fire-tube boiler barrel with a water-tube firebox. There is a prominent steam drum above the boiler barrel, making it resemble a Flaman boiler. Brotan-Defner boiler: a variant of the Brotan boiler. The steam drum was shortened and placed behind the boiler barrel, giving a much more conventional silhouette. Around a thousand of these were used in Hungary Hungarian State Railways Hungarian State Railways is the Hungarian national railway company, with divisions "MÁV Start Zrt" and "MÁV Cargo Zrt" .... . Brotan-Fialovits boiler: a further variant of the Brotan-Defner boiler. bundled-tube water-tube boiler; early large-tube water-tube boilers where the tubes were grouped into bundles (of 19, for geometrical reasons Centered hexagonal number A centered hexagonal number, or hex number, is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice.... ) that shared a common header, so as to improve shared access for tube cleaning.Kennedy, Modern Engines, Vol VI Butterley boiler: a form of Cornish boiler where the furnace was opened up into a "whistle mouth", enlarging the grate area.

C

Definitions

Points of Interest

Clarke Chapman "Tyne" boiler Vertical cross-tube boiler A cross-tube boiler was the most common form of small vertical boiler. They were widely used, in the age of steam, as a small donkey boiler, for the independent power of winches, steam cranes etc.... : a form of vertical water-tube boiler, a development of the cross-tube boiler intended to encourage better water circulation. Clarke Chapman "Victoria" boiler: a form of vertical cross-fire-tube boiler. Clarkson thimble-tube boiler: the original thimble-tube boiler, using a great many short closed-ended watertubes. Often used for heat-recovery from the exhaust of large Diesel engines. Climax boiler: A vertical water-tube boiler with many long spiral coils around a central steam-and-water drum. Cochran boiler: a vertical boiler with horizontal fire-tubes. composite boiler: a boiler used for either direct-firing, or as a heat-recovery boiler. Cornish boiler: a large horizontal stationary boiler with a single flue. cross-tube boiler Vertical cross-tube boiler A cross-tube boiler was the most common form of small vertical boiler. They were widely used, in the age of steam, as a small donkey boiler, for the independent power of winches, steam cranes etc.... : usually a vertical flued boiler with a small number of large water-carrying cross-tubes within the firebox. The term is also applied to vertical boilers with other arrangements of tubes, such as those with horizontal fire-tubes. Crosti boiler:

D

Definitions	Points of Interest

}:

• : A donkey boiler is used to supply non-essential steam to a ship for 'hotel' services such as heating or lighting when the main boilers are not in steam, for example, when in port. Donkey boilers were also used by the last sailing ships for working winches and anchor capstans.
  See also auxiliary boiler.

• Du Temple boiler: An early naval water-tube boiler, patented in 1876.

• Dublin "economic" boiler: a vertical multitubular return fire-tube design, for model engineering
  Model engineering
  Model engineering is the hobby of constructing machines in miniature. The term was in use by 1888. There is some debate about the appropriateness of the term...
  
  -scale uses.

• Dürr boiler An early naval water-tube boiler, developed and mostly used in Germany, but also trialled in the British

|}

E

Definitions	Points of Interest
egg-ended boiler: an early form of tubular wagon boiler, with hemispherical ends to support higher pressures. Elephant boiler: an early multi-cylindered wagon boiler, popular in France. express boiler: another term for small-tube water-tube boilers, on account of their high ratio between heating surface area and water volume, and thus their rapid steam-raising.

F

Definitions

Points of Interest

Fairbairn's five-tube boiler Fairfield-Johnson boiler: a later form of Johnson boiler operating at lower pressure (450psi rather than 850psi), but still a high superheat temperature 825 °F (440.6 °C). Fairlie boiler: A double-ended locomotive boiler with a central firebox, used in Fairlie's patent for double-ended articulated steam locomotives. field-tube boiler Field-tube boiler A Field-tube boiler is a form of water-tube boiler where the water-tubes are single-ended. The tubes are closed at one end, and they contain a concentric inner tube. Flow is thus separated into the colder inner flow down the tube and the heated flow upwards through the outer sleeve... : fire-tube boiler Fire-tube boiler A fire-tube boiler is a type of boiler in which hot gases from a fire pass through one or more tubes running through a sealed container of water... : A boiler with many narrow fire-tubes inside a water drum. A development of the flued boiler, where the many smaller tubes give a much larger heating surface area for the overall boiler volume. Flaman boiler: an attempt to squeeze the largest possible locomotive boiler into the loading gauge Loading gauge A loading gauge defines the maximum height and width for railway vehicles and their loads to ensure safe passage through bridges, tunnels and other structures...  by splitting the boiler into two drums: a fire-tube boiler beneath and a steam drum above. flued boiler: A boiler with only one or two large diameter fire-tubes inside a water drum. These later developed into the fire-tube boiler. forced-circulation boiler: boilers where circulation is forced by a pump, rather than relying on thermosyphon effect. These may use either forced-water-circulation (e.g. La Mont) or forced-steam-circulation (e.g. Löffler). Foster-Wheeler boiler D type controlled-superheat type ESD type (External Superheat, D type) Franco-Crosti boiler Franco-Crosti boiler The Franco-Crosti boiler is a type of boiler used for steam locomotives. It was designed in the 1930s by Attilio Franco and Dr Piero Crosti, two engineers working for the Ferrovie dello Stato , the Italian state railway.- Purpose :... :

G

Definitions

Points of Interest

Galloway boiler: a Lancashire boiler fitted with Galloway tubes. Originally these fused the Lancashire boiler's original two flues into a single kidney-shaped flue, with the tubes mounted in the joined section. Later boilers kept the cylindrical flues separate and placed the tubes within them. gothic boiler Gothic boiler A gothic boiler is an early form of steam locomotive boiler with a prominently raised firebox of "Gothic arch", "haystack", or "coppernob" shape. The term haystack is most commonly used, but is avoided here as it is confusingly used for three quite different forms of boiler. This particularly large... : an early locomotive boiler, where the outer firebox was particularly large and served as the steam dome, often highly decorated with polished brass. These were popular for early railway locomotives, from 1830 to 1850. This is another form of boiler frequently described as a "haystack". gunboat boiler: similar to the commonly known locomotive boiler, from steam locomotive Steam locomotive A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine... s. A horizontal boiler drum contains multiple fire-tubes and a separate furnace. However the furnace in a gunboat boiler has no opening at the bottom of the furnace to allow dumping of ash, the furnace is completely water cooled, similar to a scotch boiler furnace. These boilers were used in early torpedo boats and gunboats, having low height for protection from enemy gunfire.

H

Definitions

Points of Interest

Harris "Economic" boiler haystack boiler: Early balloon- or haystack-shaped, circular in plan with a domed top and often a flat base. See also Napier and gothic, quite different designs also described as "haystack" boilers. heat-recovery boiler: a boiler without its own furnace, used to recover heat from some earlier process, such as a large marine Diesel engine or an industrial furnace. Hornsby boiler: a form of bundled-tube water-tube boiler.Kennedy, Modern Engines, Vol VI Huber boiler: a return-tube boiler used in the Huber company's traction engine Traction engine A traction engine is a self-propelled steam engine used to move heavy loads on roads, plough ground or to provide power at a chosen location. The name derives from the Latin tractus, meaning 'drawn', since the prime function of any traction engine is to draw a load behind it... s.

I

Definitions	Points of Interest
Illingworth boiler: a water-tube boiler. Inglis: a modified form of the Scotch boiler, with an additional combustion chamber.

J

Definitions

Points of Interest

Johnson boiler: one of the first "modern" classes of high-pressure marine oil-fired water-tube boilers. They have a single steam drum above a single water drum. Their small-diameter water-tubes curve outwards on each side to form a cylindrical furnace. As there is no grate or ashpan beneath, firing must be by oil. Return circulation is by external downcomers. Early versions also used water-walls at each end of the furnace, later ones had plain firebrick walls.

K

Definitions	Points of Interest
Kier Kier (industrial) A kier or keeve is a large circular boiler or vat used in bleaching or scouring cotton fabric. They were also used for processing paper pulp.... : (sometimes Keeve or Kieve) an un-fired boiler, a pressure vessel heated by an external steam supply, used for bleaching in dyeworks and processing paper pulp. In use they were continuously rotated by an engine, steam being supplied through a rotating joint in the axle. They were usually spherical, sometimes cylindrical, and some were recycled from old boiler shells. Kingdom boiler: an uncommon pattern of water-tube boiler.

L

Definitions

Points of Interest

La Mont boiler: a forced-water-circulation boiler. They are often used as marine heat-recovery boilers. It was also used, unsuccessfully, for an experimental steam locomotive in East Germany in the 1950s. Lancashire boiler: a development of the Cornish boiler, with two flues. large-tube water-tube boiler: early water-tube boilers with large diameter water-tubes, of 3 inches and above, rather than the later small-tube designs. launch-type boiler Launch-type boiler A launch-type, gunboat or horizontal multitubular boiler is a form of small steam boiler. It consists of a cylindrical horizontal shell with a cylindrical furnace and fire-tubes within this.... : a small fire-tube boiler Fire-tube boiler A fire-tube boiler is a type of boiler in which hot gases from a fire pass through one or more tubes running through a sealed container of water...  used in launches and smaller steam yacht Steam yacht A steam yacht is a class of luxury or commercial yacht with primary or secondary steam propulsion in addition to the sails usually carried by yachts.-Origin of the name:... s. A horizontal cylinder in form, with a cylindrical furnace and multiple fire-tubes. They have some resemblance to a small Scotch boiler Scotch marine boiler A "Scotch" marine boiler is a design of steam boiler best known for its used on ships.The general layout is that of a squat horizontal cylinder. One or more large cylindrical furnaces are in the lower part of the boiler shell. Above this is a large number of small-diameter fire-tubes...  or Huber boiler, but with the fire-tubes extending beyond the furnace end, rather than folded back as a return-tube boiler. Sometimes small return-tube boilers of just this form are also described as "launch-type". Lentz boiler A large launch-type boiler with a corrugated furnace, used rarely for some steam locomotives. Of German design. A similar boiler, the Vanderbilt, was used in the USA. Locomobile steam-car boiler locomotive boiler: the commonly known form familiar from steam locomotive Steam locomotive A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine... s. A horizontal boiler drum contains multiple fire-tubes and a separate firebox. Löffler boiler: a forced-steam-circulation boiler. It was used unsuccessfully on a German steam locomotive of the 1930s.Milton, Marine Steam Boilers, pp. 138-141 Lune Valley boiler

M

Definitions

Points of Interest

monotube steam generator: A single tube, usually in a multi-layer spiral, that forms a once-through steam generator. The first of these was the Herreshoff steam generator of 1873. multi-tube boiler: fire-tube boiler with multiple small fire-tubes, rather than a single large flue. Mumford boiler: A form of three-drum water-tube boiler by Mumford Mumford Mumford may refer to*Mumford , a 1999 comedy*Mumford, David, a Mathematician*Mumford, Lewis, an American historian*Mumford High School in Detroit, Michigan*Mumford, a hamlet in the town of Wheatland, New York, US... of Colchester Colchester Colchester is an historic town and the largest settlement within the borough of Colchester in Essex, England.At the time of the census in 2001, it had a population of 104,390. However, the population is rapidly increasing, and has been named as one of Britain's fastest growing towns. As the... . The water-tubes are highly curved and the flue only covers the centre of the steam drum, not enclosing its whole length.

N

Definitions

Points of Interest

Napier boiler: A high-domed low-pressure boiler used on early steamships. Also known as the "haystack", although not the usual, and even earlier, haystack boiler. Niclausse boiler: a field-tube boiler, with the field-tubes set at a shallow angle to horizontal. Normand boiler: an early three-drum boiler used mainly by the French Navy. Normand-Sigaudy boiler: a siamesed Normand boiler, for larger ships.

P

Definitions	Points of Interest
Paris boiler: Paxman "economic" boiler: a form of Scotch boiler, adapted for stationary use and set in a brick surround as an external flue. pistol boiler Pistol boiler A pistol boiler is a design of steam boiler used in light steam tractors and overtype steam wagons. It is noted for the unusual shape of the firebox, a circular design intended to be self-supporting without the use of firebox stays.... : a form of small locomotive boiler with a circular firebox, to avoid the need for staying.

R

Definitions

Points of Interest

Rastrick boiler: a vertical heat-recovery boiler, typically used in ironworks Ironworks An ironworks or iron works is a building or site where iron is smelted and where heavy iron and/or steel products are made. The term is both singular and plural, i.e... . Owing to the conditions of their use, they acquired a poor reputation for safety and explosion Boiler explosion A boiler explosion is a catastrophic failure of a boiler. As seen today, boiler explosions are of two kinds. One kind is over-pressure in the pressure parts of the steam and water sides. The second kind is explosion in the furnace. Boiler explosions of pressure parts are particularly associated... s. Reed boiler: An early naval water-tube boiler. return-flue boiler: flued boiler with a single large flue that folds back on itself. Used in early steam locomotives. return-tube boiler: fire-tube boiler Fire-tube boiler A fire-tube boiler is a type of boiler in which hot gases from a fire pass through one or more tubes running through a sealed container of water...  with multiple small fire-tubes that reverse the direction of gas flow within the boiler. Individual tubes are not folded: there is usually a furnace, a combustion chamber that reverses the flow, then the tubes return from that. The Scotch Scotch marine boiler A "Scotch" marine boiler is a design of steam boiler best known for its used on ships.The general layout is that of a squat horizontal cylinder. One or more large cylindrical furnaces are in the lower part of the boiler shell. Above this is a large number of small-diameter fire-tubes...  is a well-known example of this type. Robertson boiler round-topped boiler Round-topped boiler A round-topped boiler is a type of boiler used for some designs of steam locomotive and portable engine. It was an early form of locomotive boiler, although continuing to be used for new locomotives through to the end of steam locomotive manufacture in the 1960s.They use the early form of firebox,... s are an early form of locomotive boiler, where the outer wrapper of the firebox is a semi-circular continuation of the cylindrical boiler barrel.

S

Definitions

Points of Interest

Schmidt boiler: a high-pressure locomotive boiler, as used for the experimental LMS 6399 Fury LMS 6399 Fury The London Midland and Scottish Railway 6399 Fury was an unsuccessful British experimental express passenger locomotive. The intention was to save fuel by using high-pressure steam, which is thermodynamically more efficient than low-pressure steam.... . To avoid the usual problems of scale formation in a highly-stressed firebox, the Schmidt system uses a separate primary circuit filled with distilled water Distilled water Distilled water is water that has many of its impurities removed through distillation. Distillation involves boiling the water and then condensing the steam into a clean container.-History:... . Scotch marine boiler Scotch marine boiler A "Scotch" marine boiler is a design of steam boiler best known for its used on ships.The general layout is that of a squat horizontal cylinder. One or more large cylindrical furnaces are in the lower part of the boiler shell. Above this is a large number of small-diameter fire-tubes... Scott boiler: Sentinel boiler Sentinel boiler The Sentinel boiler was a design of vertical boiler, fitted to the numerous steam waggons built by the Sentinel Waggon Works.The boiler was carefully designed for use in a steam wagon: it was compact, easy to handle whilst driving, and its maintenance features recognised the problems of poor... Sentinel-Cammel boiler Sentinel-Doble boiler Shand & Mason: shell boiler Shell boiler A shell or flued boiler is an early, and relatively simple, form of boiler used to make steam, usually for the purpose of driving a steam engine. The design marked a transitional stage in boiler development, between the early haystack boilers and the later multi-tube fire-tube boilers... : small-tube water-tube boiler: water-tube boiler Water-tube boiler A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes... s with small-diameter tubes, 2 inch or less, rather than the older large-tube designs, with tubes of 3 inch and above. Also termed Express or Speedy boilers. : A development of the pot boiler with added watertubes, used for model steam locomotives. The boiler was invented by F. Smithies in 1900 and developed by Greenly Henry Greenly Henry Greenly was amongst the foremost miniature railway engineers of the 20th century, remembered as a master of engineering design.-Miniature railways:... . It consists of a cylindrical water drum hidden inside a larger drum that forms the visible part of the model. Long slightly-sloping water-tubes are mounted beneath this water drum. The advantage of the boiler over similar model boilers is the use of almost the entire water drum surface for heating, although this also tends to scorch any paintwork on the outer drum, unless this is insulated. In a later development by Greenly, the backhead of the boiler becomes a double-walled water space and straight water-tubes are led into this at an angle. Spanner boiler: a vertical multitubular fire-tube boiler, notable for its use of "Swirlyflo" fire-tubes. Spanner boilers were also known for their use as train-heating boiler Steam generator (railroad) Steam generator is the term used to describe a type of boiler used to produce steam for climate control and potable water heating in railroad passenger cars... s. spherical boiler: Stanley steam-car boiler: an extremely compact vertical multitubular fire-tube boiler, used in the Stanley steam car. Steam generator Steam generator (boiler) A steam generator is a form of low water-content boiler, similar to a flash steam boiler. The usual construction is as a spiral coil of water-tube, arranged as a single, or monotube, coil. Circulation is once-through and pumped under pressure, as a forced-circulation boiler... : modern boilers, with very small volume in relation to their heating area. Boiling is thus almost instantaneous and the volume of heated, but unboiled, water is minimal. Stirling boiler Stirling boiler The Stirling boiler is an early form of water-tube boiler, used to generate steam in large land-based stationary plants. Although widely used around 1900, it has now fallen from favour and is rarely seen.- Design :... : an early large-water-tube boiler, used in large stationary installations. Stone-Vapor: a monotube forced-circulation steam generator formed of a single helical water-tube. Straker boiler: a vertical water-tube boiler for the Straker steam wagon. submerged multi-tube boiler: a vertical multi-tubular fire-tube boiler, with the boiler shell extended upwards in an annular ring, so as to always maintain the whole length of the tubes submerged. Used in steam wagon Steam wagon A steam wagon is a steam-powered road vehicle for carrying freight. It was the earliest form of lorry and came in two basic forms: overtype and undertype – the distinction being the position of the engine relative to the boiler... s and similar, where the water-level may be disturbed as the vehicle climbs a hill. Sulzer boiler: a monotube "once-through" steam generator Steam generator (boiler) A steam generator is a form of low water-content boiler, similar to a flash steam boiler. The usual construction is as a spiral coil of water-tube, arranged as a single, or monotube, coil. Circulation is once-through and pumped under pressure, as a forced-circulation boiler... .Milton, Marine Steam Boilers, pp. 143-144

T

Definitions	Points of Interest
three-drum boiler Three-drum boilers Three-drum boilers are a class of water-tube boiler used to generate steam, typically to power ships. They are compact and of high evaporative power, factors that encourage this use... : water-tube boilers with three drums in a triangular arrangement. The best known of these are the Yarrow and Admiralty patterns. Lesser-known examples are the Normand and Mumford. Thornycroft boiler: Several variants of an early naval water-tube boiler. Also a small annular water-tube boiler used in Thornycroft Thornycroft Thornycroft was a United Kingdom-based vehicle manufacturer which built coaches, buses, and trucks from 1896 until 1977.-History:Thornycroft started out with steam vans and lorries. John Isaac Thornycroft, the naval engineer, built his first steam lorry in 1896... 's steam wagons. Thornycroft-Schulz boiler: a development of the marine Thornycroft boiler. Thuile locomotive Thuile locomotive The Thuile locomotive was a steam locomotive designed by Monsieur Thiule, of Alexandria, Egypt, and built in 1899.-History:Thiule proposed a 6-4-8 or 6-4-6 locomotive with 3-metre-diameter driving wheels, but this was not built.... : a unique variant of the Flaman boiler using a barrel that was an elongated figure-8 section rather than circular. transverse boiler Transverse boiler A transverse boiler is a boiler used to generate steam to power a vehicle. Unlike other boilers, its external drum is mounted transversely across the vehicle.... : A boiler with the drum mounted sideways in a vehicle, such as that used by the Yorkshire Patent Steam Wagon Co. Yorkshire Patent Steam Wagon Co. The Yorkshire Patent Steam Wagon Co. was a steam wagon manufacturer in Leeds, England. They produced their first wagon in 1901. Their designs had a novel double-ended transverse boiler. In 1911 the company's name was changed to Yorkshire Commercial Motor Co., but reverted to Yorkshire Patent Steam...

V

Definitions	Points of Interest
Vanderbilt boiler An American design, similar to the Lentz and large launch-type boilers. Velox boiler: vertical boiler Vertical boiler A vertical boiler is a type of fire-tube or water-tube boiler where the boiler barrel is oriented vertically instead of the more common horizontal orientation... : flued or fire-tube designs where the main shell is a cylinder on a vertical axis, rather than horizontal. Boilers of this external form may have a great variety of internal arrangements. vertical fire-tube boiler Vertical fire-tube boiler A vertical fire-tube boiler or vertical multitubular boiler is a vertical boiler where the heating surface is composed of multiple small fire-tubes, arranged vertically.These boilers were not common, owing to drawbacks with excessive wear in service... : a vertical multi-tube fire-tube boiler.

W

Definitions	Points of Interest
wagon boiler: an early boiler, enlarged from the haystack to a flat-sided rectangular plan that permitted a larger grate area, but could only withstand low pressures. water-tube boiler Water-tube boiler A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes... Woolnough boiler: a three-drum water-tube boiler used by Sentinel Sentinel Waggon Works Sentinel Waggon Works Ltd was a British company based in Shrewsbury, Shropshire that made steam-powered lorries, railway locomotives, and later, diesel engined lorries and locomotives.-Alley & MacLellan, Sentinel Works, Jessie Street Glasgow:... . White boiler: An early naval water-tube boiler. White-Forster boiler White steam-car boiler: a monotube boiler, used in the White steam car. Woodeson boiler: a form of bundled-tube water-tube boiler. Woolf boiler:

Y

Definitions

Points of Interest

Yarrow boiler Yarrow boiler Yarrow boilers are an important class of high-pressure water-tube boilers. They were developed byYarrows and were widely used on ships, particularly warships.... : Yorkshire steam wagon boiler Yorkshire Patent Steam Wagon Co. The Yorkshire Patent Steam Wagon Co. was a steam wagon manufacturer in Leeds, England. They produced their first wagon in 1901. Their designs had a novel double-ended transverse boiler. In 1911 the company's name was changed to Yorkshire Commercial Motor Co., but reverted to Yorkshire Patent Steam... : A double-ended transverse-mounted boiler used in steam wagon Steam wagon A steam wagon is a steam-powered road vehicle for carrying freight. It was the earliest form of lorry and came in two basic forms: overtype and undertype – the distinction being the position of the engine relative to the boiler... s, to avoid problems of tilting when climbing hills. Internally it resembled a locomotive or Fairlie boiler with a central firebox and multiple fire-tubes to each end. In the Yorkshire though, a second bank of fire-tubes above returned to a central smokebox and a single chimney.