South Caradon Sump Shaft Pumping Engine House

Now this series of posts on South Caradon Mine starts to dive down into the detail, to look at the individual structures on this amazing piece of Cornish Industrial Heritage.

The first Cornish Engine house of many

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South Caradon’s Sump Shaft engine house has great historic importance, for it was here that the South Caradon mine installed its first steam engine, and it was here that the first engine house was built of what would become a major copper mining district of Caradon.

This was also the engine house that started the famous engineer William West’s long standing association with the mine’s steam engines. He would go on to install many engines on the site, and become the dominant engineer of the the district.

The engine

This building housed the first engine to be installed at the mine. It was built in 1837, and

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Sump Shaft Pumping Engine in 2010

different sources place its size at 30″, 35″ or 45″ cylinder diameter. Prior to its construction the pump was powered by flat-rods driven by a water wheel located downslope from the shaft.

As the workings expanded underground, and the original engine could not keep up with the water,  a larger 50″ engine was installed (possibly in the late 1840’s),  and this engine was still in place when the mine was finally closed.

Sump Shaft engine house in images

The engine house just before closure

South Caradon Sump Shaft pumping engine house in the 1880s.

This picture is an Enlargement of the 18th Century Picture from the
Neil Parkhouse Collection. The complete picture is contained in my reprint of Webb and Geach’s book. The shaft lies on the right of the picture with the headgear standing above it.

The Engine house in 2010

These images are resurrected from my original South Caradon website. They are images of the engine house before the Caradon Hill Project’s preservation work,

Sump Shaft pump engine house bob walltaken at a time when the house was in its gradual decay towards becoming a pile of rubble.

The Bob Wall

This view looks across the blocked shaft towards the ivy clad bob wall.

Bob Wall -The bob wall supported the bob or beam of the engine, and therefore was the strongest wall of an engine house.  It would be between four and seven feet thick, and often constructed of dressed granite. In a pumping engine the bob wall was adjacent to the shaft.

 

Sump Shaft engine house plug doorway

The view from the inside looking towards the shaft

The dressed granite arch is that of the Plug doorway. This doorway was at the driver’s floor level and gave him a view of the condenser and pitwork.

The inside of the engine house is in poor condition, and little can be seen of the internal layout.

A view of the boiler house

Sump Shaft boiler house

The layout of the boiler house is clear in this view with the seats of the three Cornish boilers discernible, and the flue openings visible at the far end of the house. Only a stump remains of the stack.

Boiler houses were generally of a far lighter construction than the engine houses they served. Remains are therefore less visible, and often non-existent.

The engine House in 2012

Sump Shaft Pumping engine house bob wall

Between the this images and the previous ones a major change had occurred at Sump shaft. The buildings had been cleaned, restored and stabalised. The decay has been paused, natures reclamation has been halted and the remains have been preserved for future generations to explore.

This is another view of the bob wall. The ivy has gone and the stonework re-pointed.

Sump Shaft Pumping Engine House site

The layout of the Pumping engine house is captured in this view.  From left to right the remains are: Shaft-Engine house-Boiler house.

Sump Shaft Pump Engine house site

The Engine House in 2015

Sump shaft engine houses in the snow

Snow came to South East Cornwall in 2015, bringing with it crystal clear light that brought the buildings into sharp contrast.  This view was caught over those rare crisp cold days, and it shows well the extent of the engine house remains. Only two walls now stand; the bob wall to the left, and the partial remains of the wing wall to the right.

Wing Walls-The side walls of an engine house.
Wing walls were about 2’6″ to 3’6″ thick. Being the weakest walls these were often the first parts of the building to collapse.


wpid-wp-1438632680446.pngWebb and Geach

The History and Progress of Mining in the Liskeard and Caradon District

This paperback contains the Victorian Photograph mentioned in this post.

If you are visiting the area then pop into the excellent bookshop in Liskeard for a copy.

Click here to learn more about the book>

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The President Steam Engine- an index of posts so far

screenshot_2017-06-13-12-11-12_kindlephoto-18516640.jpgA Cornish Engine in the USA

“The only two non-William West lattice beams I know of is the Harleem Meer Engines in the Netherlands and the President Engine in the USA. The former was influenced by his Austen’s engine, and the latter designed by his nephew, John West”  From a talk given to the Friends of Luxuylan  Valley

This was my sole knowledge of the President Engine before I started this short series of posts; some throw away lines that I soon discovered greatly undersold this very important piece of Industrial heritage.  Before this blog moves on to new topics, I will gather together the posts in an index. 


The President Engine

The President Engine was claimed to be the largest stationary engine in the world, and is

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The engine house in 2017

the it is the only remaining Cornish Engine house still standing in the USA. It was built by John West from Cornwall, forming an important example of how the Cornish engine concept being developed to meet the needs of North American mining industry.

This is an engine that deserves more recognition; a site that forms not only an important part of the USA’s industrial heritage, but also that of Cornwall’s rich engineering history.

The President Engine posts

Related Posts

External links

 

PresidentPostcardDuring the writing of these posts I discovered that there was a large amount of activity underway in the USA to preserve the President Engine house. I will update this blog with progress of that work, and hopefully will sometime in the future have the pleasure of hosting a post starting with the title “Reasons to visit the President engine house”. Meanwhile, if any readers know of websites or publications relating to the engine please drop me a message and I will gladly pass on the information here.

And finally, many thanks to  Mark Connar for providing much of the information within these recent posts. Good luck over there across the pond in preserving this wonderful piece of mining heritage.


 

To learn more about John West’s famous Uncle

Here are two publications on William West of Tredenham, the last Great Cornish Engineer; one a paperback, one a Kindle publication.

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The Cornish Engine House in Virgin Gorda

EhPan1A little snippet of Cornwall in the British Virgin Islands

My last post on the President Steam Engine in the USA mentioned another remnant of Cornish mining across the Atlantic; the Virgin Gorda engine house. By pure chance that was and engine house that I have had the chance to visit, and so it seemed like a good excuse to locate the files on the laptop, and give them a public airing. 

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My visit to this fascinating site in 2009 was a result of one of those rare occasions where my leisure (Cornish mining History) and professional  (Navigation) interests crossed paths. In this case the ship I was navigating anchored off Tortola, and I managed to grab a few hours off in the afternoon to explore.

Whilst my fellow shipmates headed rapidly off in one direction to explore the delights of the Pussers Rum distillery, I headed off in another direction to locate a copper mine.

Copper point- a Surreal Juxtaposition

The scenery that greeted me at Copper Point proved to be ample reward for the

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hike across the Island for forsaking the chance to devour ‘Painkiller; cocktails all afternoon. It seemed so surreal, drystone Cornish walls and Caribbean scenery.  Vegetation from one Continent growing around the iconic architecture of another.

The engine house was partially standing with its bedstone still in place inside.

 

 

Remnants of past industry

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This site has remains that are rare in Cornwall; ironwork.  Sat among the piles of masonry I found the rusting remains of a boiler.  Its survival in this salt laden atmosphere without preservation was remarkable.

The real gem of this site I found after some scrabbling down to the waterline. For there laying partly submerged in the sea lay the engine’s bob.

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Partially encrusted in barnacles, and draped in fishing gear the two halves of a Cornish Engine Beam lay on the sand acting as a reminder on how far the Cornish and their technology traveled around the world, chasing the copper, chasing the tin.DSCF2429.JPG

The nearest source of refreshments to the site was a bar aptly named The Mine Shaft, and there hung from the ceiling I discovered one final  reminder of Cornwall, A St.Piran’s flag. The white on black hung in a wooden shack, in a far off Caribbean Island; a perfect excuse to toast Cousin Jack if there ever was one!

 


The next post in this blog is planned to finish the series on the President Engine. Meanwhile, if you are a professional navigator, then pop across to  have a look at my other blog at Navsregs.

 

Reasons to preserve the President Steam Engine

I started these posts to discover more about the links between this engine house in Allentown USA and William West. In the process of exploring this distant influence of the last great engineer I learnt that this was no ordinary steam engine, this was a very significant piece of 19th Century engineering that deserves more recognition and preservation.

Why should the President Engine be preserved?

On one basic fact the President Engine in Pennsylvania cries out to be preserved-  it is the only example of a Cornish Engine house still standing in the Americas outside of Mexico. As shown in my last post, Cornwall is rich in engine house remains but in the USA there stands just this one, hidden away from public view.

Mark Connar gives five reasons to preserve the engine house, five reasons that justify keeping this structure for future generations.  I have dipped in to his paper and pulled out these extracts to summarise those reasons.

Reason 1 -It is a National Landmark of Mining History

“The Friedensville pumping engine house held the largest Cornish derivative single-cylinder beam pump ever built for use in a mining application and its’ engine house is the only known existing and extant example of such a structure in the Americas (apart from a few examples in Mexico near El Real and Pachuca).There is a partially

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The Virgin Gorda Engine housed

restored, but fragmented, engine house example in Nova Scotia and one very ruined Cornish engine house structure on Virgin Gorda in the British Virgin Islands.”

“As we consider the evolution of technology, the Friedensville engine house is an archaic form compared to how the Cornish pumping engine was being adapted in North America and, therefore, represents a unique fulcrum point in the technological acculturation of this equipment in the Americas. In the California gold fields, Cornish engineers passed the baton to American designers who adapted this critical equipment to the North American environment.”

“Given the unique architectural character and its interconnected relationship to the pump design, it is the writer’s opinion that the Friedensville engine house structure is worthy of nomination by the US Department of Interior for a listing in the National Register of Historic Places as a mining property of significance in America’s development. ”

“The Friedensville engine house is a pure example of a Cornish engine house whose use as such is well documented. In this respect it is unique in the United States. Architecturally, the Friedensville engine house could be transposed on to the Devon or Cornwall landscape and fit perfectly into this renowned UNESCO World Heritage location that includes approximately 200 preserved engine houses that form an iconic part of the cultural heritage.”

Reason 2- It is a historical landmark of mechanical engineering

“The President was not first the Cornish Pump located at the Ueberroth Mine in Friedensville. Prior to the construction of the President, Lehigh Zinc’s engineer, John West from Cornwall, designed and installed a pumping engine that was capable of pumping 5700 gallons of water per minute from a depth of 132 feet. He also brought to the Ueberroth Mine a pumping engine he built before 1853 that some consider the first engine built on Cornish principles in America (this Pump most likely came from the Perkiomen copper mines). Some early mining equipment originated from Cornwall, but clearly John West’s work at Perkiomen and Ueberroth collectively are among the earliest representations of American design and manufacture of Cornish Pumps.”

“The President pump was clearly the largest steam driven stationary single-cylinder pumping engine ever used in any application in the Western Hemisphere and the largest Cornish derivative beam pump ever used in a mining application on a global basis.”

“The President pump was not simply a very large “throw back” to the past. In screenshot_2017-06-13-12-07-40_kindlephoto-18444209.jpgaddition to incorporating a latticework beam design, which is attributed to the West family, the President included an innovative float device that “automatically” adjusted the speed of the engine based on the water level at the bottom of the mine.”

“It has been  argued that without the Cornish Pump, the development of the deep, hard-rock gold mines in California would have been delayed for nearly half a century (until the introduction of electric motor-driven pumps).”
“Given the importance of the Friedensville site in the development of the steam engine technology and the fact that it once was home for the largest stationary single-cylinder pumping engine in the Western Hemisphere and largest Cornish derivative single-cylinder beam pumping engine in the world in a mining application, the pumping engine site deserves consideration as a Mechanical Engineering Heritage Site as part of the American Association of Mechanical Engineers (ASME) Landmarks program. Also, as noted above, its design was not a technological “dead end”, but rather an important linchpin in the adoption of this technology in the United States. Further, as discussed above, the physical remains of the engine house are more than just stonewalls; as a “house-built” engine much can be learned of the engine’s design, layout and operation from the engine house, even though the engine itself is long gone. The Landmarks program has recognized about 250 landmarks since its inception in 1971.  Such designation would foster the preservation of the physical remains, encourage engineers to become aware of their technological heritage and further inform the public of the heritage site’s contribution.”

Reason 3-It is a heritage site of importance to Cornish American Studies

“While Friedensville was largely a village peopled by those of German descent, the Cornish presence would have been in much  evidence during the zinc mine’s operations. Technicians, engineers and  some of the skilled labor force were Cornishmen.”

“The Cornish are understandably  proud of their contribution to the mining industryDSCN0137 and related technologies, not only as practiced in Great Britain, but also globally given the significant export and migration history emanating from this  small county. The President pump and its engine house are known to The Trevithick Society thanks to the efforts of Professor Nance. The  writer believes that other organizations dedicated to Cornish studies and the history of Cornish contributions to mining and steam  technology would likewise find the site to be of great interest.”.

Reason 4-It is a heritage site of regional importance

“The Ueberroth Zinc Mine Historic District has suffered a large  number of losses in recent years. The extension of Interstate 78  through Saucon Valley, the routing of

PresidentMap
Ueberroth mine map from
Kent Littlefield’s 2014 presentation

Saucon Valley Parkway and the  development of the Stabler Land properties has all served to comprise  this historic area. Among the structures, which have been lost, include  the Correll miner cottages (between Oakhurst Drive and Route 78), the  Methodist Church (on Old Bethlehem Pike) and the secondary  structures around the President pumping engine house. The Mine  Master’s House (1868) on Friedensville Road will soon be lost to the  wreaker’s ball to make room for office suites. With this last loss, the  only significant above ground, visible remnant of 19th century mining  activity will be the water filled quarry pits and the Cornish engine house  that contained the President pump.”

Reason 5- It is in a location of scenic Beauty

“With clearance,  preservation, historic interpretation and development, it is very

president2016lake
The engine house in 2017 Mark Connar

easy to picture the location as being a highly scenic and valued destination. It  would attract historically minded tourists as well as the general public who would find the view “romantic”. The ruined pumping engine house,  even after preservation, overlooking a lake with beautifully colored water, would attract photography buffs and possibly even filmmakers. The location would be perfect for wedding photos and other special occasions. With the medieval character of the pumping house in the  background, the site would be hard to duplicate in the region.”

I will keep this blog updated with news of progress towards preservation of the engine house. Meanwhile Mark’s first reason for preservation has offered me a great excuse to take a quick detour to explore my photograph’s for images of the Virgin Gorda engine house, the topic for my next post.


wpid-image.jpgTo learn more about John West’s Cornish Uncle, visit on this blog’s William West Page.

A melody of Cornish Engine Houses

DSCF4520SumpSnow

This series of posts on the President Steam Engine in Philadelphia USA now takes a brief DSCF2663diversion that takes it back to Cornwall.  When I started to build this post my idea was a simple one of hunting around the corners of my laptop to discover some photographs of Cornish Engine houses that could be used as a comparison with the images of the President.  However, as I started to copy the images onto this page it dawned on me that here was an opportunity to reflect on the role of the engine houses in our landscape, a reflection that may form an introduction to the final part of the President series.

Cornish Engine Houses a reflection

Cornwall’s landscape is adorned with the iconic shape of disused mine engine houses, DSCF2658and their images are scattered throughout its culture. Book covers, websites, gifts,  postcards, calendars, business logos, and road signs all pull on the strong identity it portrays. Some of its importance in the Cornish physical and cultural landscapes arises from the sheer physical bulk of the structures; apart from castles there are no other historic remains that demand such attention as the empty shells that once housed the large Cornish Steam engines. However, there is more to their importance than just physical size, and this post will reflect on some of those other factors.

Aesthetic value

A combination of dramatic landscapes and dramatic buildings often combined to DSCF4135produce some amazing scenery. Sometimes it is the setting of the engine house, sometimes it is the architecture of the building, sometimes it is nature’s encroachment and occasionally it is a combination of all of these that provides such rich landscape value.

There is a great irony is this, for many of these views started as scenes of industrial chaos. Every square foot of ground around the engine houses would have been taken up with a haphazard mess of tips, buildings, shafts, tramways and debris. The air would have been thick with smoke and fumes, the streams running with toxic waste and the defining sounds of stamps would have drowned out nature.DSCF9727

But time and nature have now softened these grand industrial landscapes, a process that has left just the engine houses standing as isolated remains of the once huge industrial complexes.

Not all engine houses have such value, some are unfortunate to be in locations that hold no visual pleasure, and others are of designs or proportions that simply do not please the eye. But there are a few engine houses whose presence creates some of the most memorable scenery in the world, Wheal Coates and Bottallack fall firmly into that category.

Political value

whimsillThis may a appear an unusual value to place on industrial heritage, however the visual reminder of the engine houses keep within the public consciousness that this once a land alive with industry, a land of mass employment.

The UK has transformed itself into a service industry based society, and Cornwall is perceived from the outside as a holiday destination or bolt hole for second home owners or those seeking lifestyle changes. And yet Cornwall was once one of the biggest industrialised regions in the world. Mining and its associated industries employed tens of thousands or workers, whilst Cornish Technology and engineering lead the world.

PumpviewupWhilst the engine houses still stand, they act as a reminder that this was once a working landscape, that there is more to the economy that property prices, holiday lets and Poldark souvenirs. Such a reminder has a value for the future, especially for future generations wishing to find work west of the Tamar.

Historic Value

Many engine houses remain standing whilst the scenes of industry that once surrounded dscf9312them have long disappeared. In doing so they act as pegs onto which to hang tales of history. Without them there would be little left to mark the existence of the thousands of Huels, Wheals, and Consols that once crammed every corner of Cornwall.

Each mine had a stories worth discovering; sometimes wealth, sometimes losses and sometimes fraud. There are tales of death, tales of innovation and countless tales of hope.  In some cases it is the engine house itself thatW7 provides a stepping stone into history, marking technological advances or famous engineers.

Such an example is Austen’s engine house at Fowey Consols, at which so many threads of history can be followed back and forward in time. Those threads lead to many other engine houses, many of which have fascinating stories to tell.

Amenity Value

We are in an era dominated by the virtual world, a world where the physical holds less and less

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importance. In such a world some of the  Cornish Engine houses have found a small, but important role of providing purpose  to a location.  Such a purpose can attract us into the location to photograph, paint, record, explore, or just look at the building. They can become the reason for a journey, or a ‘croust’ stop along the way. Often such stops may stir up some curiosity to discover more, to ask questions that may lead to more journeys.

I find a walk in Cornwall is rarely historically sterile, every bump, dip, building relic or lump of fallen masonry seems to have the potential for significance. This richness

wpid-wp-1422994037468.jpegof landscape only became truly apparent tome on walks in many other parts of Britain where a footpath was just a footpath; nothing to find, nothing to explore.

A reflection taken forward

After that brief detour into Cornish engine house I will return in the next post to the USA  with some more words about the President Engine.  In doing so I should;  now be able to grasp the significance of its engine house more clearly after reflecting some of our own heritage here in Kernow.

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The only Cornish Engine House in the USA

PresidentPostcardThe President Engine House

This series of posts on the President Steam engine in Philadelphia has led me far further then I expected. It started off with a desire to expand my knowledge of  an engine with William West links; to gain some knowledge that I could use in future talks about the Last Great Engineer.  And now I find myself writing about probably one of the most significant Industrial Heritage sites in the USA.   In this post I bridge the gap between the past and now with a description of the engine house, the structure that links today’s modern landscape with its history.

The remains of the  President’s engine house stands in Allentown Philadelphia, a very long way from where I write this blog in Cornwall. Therefore I will  use the words and images from Mark Connar’s excellent paper on the Ueberroth Zinc Mine to describe the structure.

The Engine House described

“The square shaped pumping engine house is built of Potsdam Sandstone and is three stories high with the first floor at the elevation of the air pumps and condenser, the second floor near the top of the cylinder, and the third at the level of

President2017
The engine house in 2017

the beams. Overall the structure is 40 feet high. The north wall (called the “bob” wall in Cornish pump house design parlance), which supported the beams, is 9 feet thick with slots for the two flywheels, the south wall contains the cylinder opening, above which is the steam inlet and recesses for the two spring beams. This wall is also 9 feet thick and the other two walls (east and west) are 4.5 feet thick. Two square stacks that served the engine’s 16 boilers occupy the rear corners (face Old Bethlehem Pike). The boilers were housed in an adjoining building. The house plan is dominated by a central masonry platform, to which the engine was anchored, with large pits on either side for the flywheels and cranks.”

President2017_2An indication of the sturdiness of this structure is that it sits on a rock formation 114 feet below ground surface and the foundation for the engine is thirty-two feet below the rock face. Another Cornishman named Simeon Noell was charged with the responsibility to oversee the engine house erection that commenced in 1868. Overall, the structure is very typical of engine houses that populate the Cornish and West Devon landscape in the United Kingdom.

The basic structural design is highly functional and little changed from the enginePresidentWingwall houses first built in the early decades of the 18th century. The President was a “house-built” engine in that the engine house was an integral part of the engine, supporting it rather than simply providing weather protection for equipment and staff. The foundation is sturdy; it had to be capable of withstanding the stresses the engine could produce. The “bob-wall” carried the main weight and thrust of the engine. The interior layout of the pumping engine house was a basic Cornish pattern. The first floor, or bottom chamber, was known as the “driving floor” because it accommodated the throttle and other controls. Here the engineers had access to the lower portion of the key equipment. The second floor or middle chamber allowed access to the cylinder head and upper valve chest. The third floor was called the “bobloft” was this level allowed access to the beam for servicing and also held tackling gear used to lift heavy parts of the pump when repairs were necessary.”

The Engine house today

“The current condition of the engine house is derelict. It is enclosed by a security President2017Bobfence and is overgrown with vegetation. The brick chimney stacks are no longer standing (I have observed this structure for over 50 years and do not recall ever seeing the brick stacks, however, they are visible in photographs from the 1930s and early 1940s). The structure is best viewed in the fall and winter when less obscured by vegetation. The pumping house is the only visible remains when viewed from outside the gated area, however, a report by Professor Miller of Lehigh University prepared in 1923 indicated that an office structure was also remaining on the site.” Mark Connar

This now seems to be an appropriate place to take a quick detour from the President Engine, and look at some Cornish engine houses over here in Cornwall for a comparison. So its time to start digging into some of the hidden depths of my laptop filing system and see what suitable images I have hidden away.  So if you are reading this blog from across the pond please keep following, as I hope some of the photos may hint at the potential of this amazing building hidden away in Philadelphia. 


51tRtgzctrL__SL160_PIsitb-sticker-arrow-dp,TopRight,12,-18_SH30_OU02_AA160_ The engine house featuring on the cover of the Kindle Edition of William West of Tredenham is that of the famous Austen’s Engine at Fowey Consols, in mid-Cornwall. This 80″ engine was fitted with a lattice beam similar to the one used by the President,

 The President Steam Engine described

 A Cornish engine in the USA

Now this series of posts on John West’s massive steam engine arrives at the point where it digs into the technical details. I have extracted various facts from the Damian Nance’s article, sifted, sorted and summarised to give a summary of the engine.

What was the President Engine?

The President was a rotative double acting engine with a 110″ cylinder, a 10 foot stroke screenshot_2017-06-13-12-07-40_kindlephoto-18444209.jpgand weight of 675 tons Although described as a Cornish engine, but had many features not common to pumping engines in Cornwall, i.e. it was rotative had flywheels, and was  double acting.

The engine was named after president Ulysses S. Grant, who had been invited to its dedication but  then failed to arrive.

Who built the engine?

The Cornish Engineer John West built the engine (the nephew  of William West, the Last Great Cornish Engineer), and its components were built by various companies in Eastern USA. Merrick and sons built the engine at their Southwark factory Philadelphia, but  much of the casting was  done at Lazell Perkins and co Bridgewater Massachusetts. The Pumps, boilers and  mountings were produced by  LP  Morris and co, Philadelphia.

Click here for information on Merrick and sons on the Philadelphia encyclopedia>

What did the engine do?

The engine was built to pump large quantities of water from a relatively shallow  mine shaft. Accounts of the engine differ in the number of pumps installed. Some state two pair, some three. Each pair of pumps consisted of a  lifting pump at the bottom of the shaft, and a 30″ plunger pump part way up. The lifting pumps were only  at a depth of 127 feet, very shallow compared to the Cornish mines of the time which were down to thousands of feet deep. The engine pumped at  15000 gallons per minute at 12 strokes per minute, and discharged into an adit and into a tank for use as boiler and condenser feed-water.

 

How was the steam provided?

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The three roofs of the boiler house.

An engine of this size demanded large quantities of steam, and so it had an impressive array of boilers. The President was served  by 16 boilers in a boiler house to the rear of the engine house, each boiler was 50 feet long with a 36 inch diameter.

The engine was designed to run at 60 psi at which pressure it produced 3000  horsepower, although in use it was normally run at a lower pressure.

What was the key features of the President Engine?

Apart from its sheer size the President had several interesting features that set it apart from the standard arrangement of a pumping engine back in Cornwall. These differences arose from the shallow depth of the mine. Engines running expensively on the Cornish cycle are more effective if they have a load of the heavy pump rods in the shaft. To replace this John West designed the engine with large 92 ton flywheels of over 30 foot diameter. For smoother operation of the flywheel West made the engine double acting (powered on both up and down strokes).

Note: The weight and diameter of the flywheel has been shown differently on some engine descriptions.  These figures have been confirmed as the most likely to be correct by Mark Connar, who I thank for the additional information.

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Although he installed Cornish style steam valves, the operating method was unusual. Valve operation was through cams fitted on the flywheel shaft, three cams for three different values of cut-off. The  throttle valve was fitted with an automatic control using a block of wood in the sump of the shaft connected by wire to the valve. An ingenious arrangement that allowed more steam to enter the engine as the water level rose.

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The lattice beams

These are the features that attracted me to the engine. Although Open-work beams are graceful and light, they did not become widely adopted. Their main user was John West’s Uncle, William West of Tredenham. All of his most important engines used this design, and it is no doubt the family influence that resulted in their distinctive form being adopted for the President.

Reference

Damian Nance, The International Steam Engine Society Bulletin volume 34 no 4

 


wpid-westcover.jpg The story of William West is told in the Trevthick Society papaerback ‘The Last Great Cornish Engineer‘.