John Ericsson was a Swedish-American inventor who was active in England and the United States. Some of his notable inventions include contributions to early steam locomotives and naval warships. He designed Novelty, an early steam locomotive that competed in the Rainhill Trials in England. In the US, he designed the USS Princeton, the Navy's first screw-propelled steam frigate, and the USS Monitor, the first ironclad warship with a rotating gun turret, which played a pivotal role in the American Civil War.
A PPT material about the first attempts to fly and the history of aviation made by a student involved in the Comenius multilateral partnership “From Icarus to Interplanetary Travels”
A PPT material about the first attempts to fly and the history of aviation made by a student involved in the Comenius multilateral partnership “From Icarus to Interplanetary Travels”
A PPT material about the first attempts to fly and the history of aviation made by a student involved in the Comenius multilateral partnership “From Icarus to Interplanetary Travels”
A PPT material about the first attempts to fly and the history of aviation made by a student involved in the Comenius multilateral partnership “From Icarus to Interplanetary Travels”
A PPT material about the first attempts to fly and the history of aviation made by a student involved in the Comenius multilateral partnership “From Icarus to Interplanetary Travels”
Historical photos with music. On Monday, August 6, 1945, at 8:15 AM, the atomic bomb Little Boy was dropped on Hiroshima by an American B-29 bomber, the Enola Gay, directly killing an estimated 80,000 people. By the end of the year, injury and radiation brought total estimated casualties to 140,000. Approximately 69% of the city's buildings were completely destroyed, and about 7% severely damaged.
In the 18th century, transportation was primitive by today's standards. The majority of the time if you wanted to go anywhere you either walked or rode a horse on trails or rough roads. Most folks could not afford carriages or wagons. People traveled from one country to the next by small wooden ships or stagecoach services.
Briefly describe how the development of steam powered ships transfor.pdfprajeetjain
Briefly describe how the development of steam powered ships transformed naval warfare.
Solution
Development of steam powered ships
And transformation in naval warfare
A steamship, often referred to as a steamer, is an ocean faring seaworthy vessel that is propelled
by one or more steam engines that typically drive (turn) propellers or paddlewheels. The first
steamships came into practical usage during the early 1800s;
The first steam engines worked by filling a cylinder with steam, then condensing it to water. The
vacuum created drew the piston into the cylinder. These “atmospheric” engines were useful for
pumping out mines and other tasks where their weight was not important. They were far too
heavy and bulky to use aboard ships, however. James Watts’s improved steam engine drove the
piston in the opposite direction—expanding steam, rather than atmospheric pressure on a
vacuum was the driving force. Such engines could be made small enough to power a ship. Their
earliest use was to turn a pair of huge side wheels.
Steam gave navies a great strategic advantage. Steam warships no longer depended on weather
and could cross the oceans much faster than sailing ships. “Seizing the weather gauge”
(maneuvering into the best location to take advantage of the wind) had long been a favorite tactic
of British seamen. It no longer gave any advantage. For that reason, Britain, although it was the
home of the first steam engines and it utterly depended on its navy for its primacy in world
affairs, tried to retard the development of steam-powered ships. British naval personnel were the
most skilled in the world; British shipyards devoted to building sailing men-of-war were the
biggest in the world; British technology in preserving food for long journeys, manufacturing the
heavy, short-range cannons, called carronades, and everything else needed for wooden, sail-
driven warships, led the world. If the world’s navies went to steam, all of that would be
worthless.
In 1828, the British admiralty expressed their views on steam-powered warships:
Their lordships feel it is their bounden duty to discourage to the utmost of their ability the
employment of steam vessels, as they consider that the introduction of steam is calculated to
strike a fatal blow at the naval supremacy of the Empire.
Steamships. In his classic study, Sea Power in the Machine Age, Bernard Brodie observed that
navies were relatively late in utilization of the technological advances of the machine age.
Progress in steampower development was followed closely by the various admiralties—Great
Britain, France, and the United States being most active. During the nineteenth century, the
steam warship was by far the most important of the great naval revolutions, the most significant
such innovation in warships since the fifteenth century. Steampower completely revised naval
tactics and strategy; now ships could go anywhere, any time. During a transition period at
midcentury, the largest warships retaine.
A PPT material about the first attempts to fly and the history of aviation made by a student involved in the Comenius multilateral partnership “From Icarus to Interplanetary Travels”
Historical photos with music. On Monday, August 6, 1945, at 8:15 AM, the atomic bomb Little Boy was dropped on Hiroshima by an American B-29 bomber, the Enola Gay, directly killing an estimated 80,000 people. By the end of the year, injury and radiation brought total estimated casualties to 140,000. Approximately 69% of the city's buildings were completely destroyed, and about 7% severely damaged.
In the 18th century, transportation was primitive by today's standards. The majority of the time if you wanted to go anywhere you either walked or rode a horse on trails or rough roads. Most folks could not afford carriages or wagons. People traveled from one country to the next by small wooden ships or stagecoach services.
Briefly describe how the development of steam powered ships transfor.pdfprajeetjain
Briefly describe how the development of steam powered ships transformed naval warfare.
Solution
Development of steam powered ships
And transformation in naval warfare
A steamship, often referred to as a steamer, is an ocean faring seaworthy vessel that is propelled
by one or more steam engines that typically drive (turn) propellers or paddlewheels. The first
steamships came into practical usage during the early 1800s;
The first steam engines worked by filling a cylinder with steam, then condensing it to water. The
vacuum created drew the piston into the cylinder. These “atmospheric” engines were useful for
pumping out mines and other tasks where their weight was not important. They were far too
heavy and bulky to use aboard ships, however. James Watts’s improved steam engine drove the
piston in the opposite direction—expanding steam, rather than atmospheric pressure on a
vacuum was the driving force. Such engines could be made small enough to power a ship. Their
earliest use was to turn a pair of huge side wheels.
Steam gave navies a great strategic advantage. Steam warships no longer depended on weather
and could cross the oceans much faster than sailing ships. “Seizing the weather gauge”
(maneuvering into the best location to take advantage of the wind) had long been a favorite tactic
of British seamen. It no longer gave any advantage. For that reason, Britain, although it was the
home of the first steam engines and it utterly depended on its navy for its primacy in world
affairs, tried to retard the development of steam-powered ships. British naval personnel were the
most skilled in the world; British shipyards devoted to building sailing men-of-war were the
biggest in the world; British technology in preserving food for long journeys, manufacturing the
heavy, short-range cannons, called carronades, and everything else needed for wooden, sail-
driven warships, led the world. If the world’s navies went to steam, all of that would be
worthless.
In 1828, the British admiralty expressed their views on steam-powered warships:
Their lordships feel it is their bounden duty to discourage to the utmost of their ability the
employment of steam vessels, as they consider that the introduction of steam is calculated to
strike a fatal blow at the naval supremacy of the Empire.
Steamships. In his classic study, Sea Power in the Machine Age, Bernard Brodie observed that
navies were relatively late in utilization of the technological advances of the machine age.
Progress in steampower development was followed closely by the various admiralties—Great
Britain, France, and the United States being most active. During the nineteenth century, the
steam warship was by far the most important of the great naval revolutions, the most significant
such innovation in warships since the fifteenth century. Steampower completely revised naval
tactics and strategy; now ships could go anywhere, any time. During a transition period at
midcentury, the largest warships retaine.
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Presentation by Heather Noel-Smith and Lorna M. Campbell for the Press Gangs, Conscripts and Professionals Conference, National Museum of the Royal Navy, September 2013.
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This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
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The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
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it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
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http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
1. John Ericsson
was a Swedish-American inventor. He was
active in England and the United States.
Text Wikipedia
2. John Ericsson (born Johan Ericsson; July 31, 1803 – March 8, 1889) was a
Swedish-American inventor. He was active in England and the United States.
Ericsson collaborated on the design of the railroad steam locomotive Novelty,
which competed in the Rainhill Trials on the Liverpool and Manchester Railway,
which were won by inventor George Stephenson's (1781-1848), Rocket. In North
America, he designed the United States Navy's first screw-propelled steam-frigate
USS Princeton, in partnership with Captain (later Commodore) Robert F. Stockton
(1795-1866), who unjustly blamed him for a fatal accident. A new partnership with
Cornelius H. DeLamater (1821-1889), of the DeLamater Iron Works in New York
City resulted in the first armoured ironclad warship equipped with a rotating gun
turret, USS Monitor, which dramatically saved the U.S. (Union Navy) naval
blockading squadron from destruction by an ironclad Confederate States naval
vessel, CSS Virginia, at the famous Battle of Hampton Roads at the southern
mouth of Chesapeake Bay (with the James River) in March 1862, during the
American Civil War.
3. Early career
Johan Ericsson was born at Långban in
Värmland, Sweden. He was the younger
brother of Nils Ericson (1802–1870), a
distinguished canal and railway builder in
Sweden. Their father Olaf Ericsson (1778–
1818) had worked as the supervisor for a
mine in Värmland. He had lost money in
speculation and had to move his family to
Forsvik in 1810. There he worked as a
director of blastings during the excavation
of the Swedish Göta Canal.
4. The extraordinary skills of the two Ericsson brothers were discovered by
Baltzar von Platen (1766–1829), the architect of Göta Canal. They were dubbed
'cadets of mechanics' of the Swedish Royal Navy, and engaged as trainees at the
canal enterprise. At the age of fourteen, John was already working independently as
a surveyor. His assistant had to carry a footstool for him to reach the instruments
during surveying work. At the age of seventeen he joined the Swedish army in
Jämtland, serving in the Jämtland Ranger Regiment, as a Second Lieutenant, but
was soon promoted to Lieutenant. He was sent to northern Sweden to do
surveying, and in his spare time he constructed a heat engine which used the
fumes from the fire instead of steam as a propellant. His skill and interest in
mechanics made him resign from the army and move to England in 1826. However
his heat engine was not a success, as his prototype was designed to burn
birchwood and would not work well with coal (the main fuel used in England).
5. Notwithstanding the
disappointment, he invented
several other mechanisms instead
based on steam, improving the
heating process by incorporating
bellows to increase oxygen supply
to the fire bed. In 1829 he and
English engineer John Braithwaite
(1797–1870) built Novelty for the
Rainhill Trials arranged by the
Liverpool and Manchester
Railway. It was widely praised but
suffered recurring boiler problems,
and the competition was won by
English engineers George and
Robert Stephenson with Rocket.
Novelty, Braithwaite and Ericsson's entry
for the Rainhill Trials. Illustration from
The Mechanics Magazine, 1829.
6. Replica of the Novelty in the
Transport Museum in Nuremberg
during the exhibition "Adler,
Rocket and Co."
7. Two further engines were built by Braithwaite and Ericsson, named
William IV and Queen Adelaide after the new king and queen. These were
generally larger and more robust than Novelty and differed in several details (for
example it is thought that a different design of blower was used which was an
'Induced Draught' type, sucking the gases from the fire). The pair ran trials on the
Liverpool and Manchester Railway but the railway declined to purchase the new
designs.
Their innovative steam fire engine proved an outstanding technical success by
helping to quell the memorable Argyll Rooms fire on February 5, 1830 (where it
worked for five hours when the other engines were frozen up), but was met with
resistance from London's established 'Fire Laddies' and municipal authorities. An
engine Braithwaite and Ericsson constructed for Sir John Ross's 1829 Arctic
expedition failed and was dumped on the shores of Prince Regent Inlet. At this
stage of Ericsson's career the most successful and enduring of his inventions was
the surface condenser, which allowed a steamer to recover fresh water for its
boilers while at sea. His 'deep sea lead,' a pressure-activated fathometer was
another minor, but enduring success.
8. German drawing (1833) of the steam locomotive Wilhelm IV with scale in feet, built by
"Braithwaite und Ericsson".
9. The commercial failure and development costs of some of the machines
devised and built by Ericsson during this period put him into debtors' prison for an
interval. At this time he also married 19-year-old Amelia Byam, a disastrous
match that ended in the couple's separation until Amelia's death.
Education
His only formal education was a basic officer's education and training during his
time in the Swedish Army. On March 27, 1822, John passed a surveyor's
examination in Stockholm. As a child he was taught to be a miner and surveyor
by his father.
10. Propeller design
John Ericsson (1878)
He then improved ship design with two screw-propellers moving in different
directions (as opposed to earlier tests with this technology, which used a single
screw). However, the Admiralty disapproved of the invention, which led to the
fortunate contact with the encouraging American captain Robert Stockton who had
Ericsson design a propeller steamer for him and invited him to bring his invention
to the United States of America, as it would supposedly be more welcomed in that
place. As a result, Ericsson moved to New York in 1839. Stockton's plan was for
Ericsson to oversee the development of a new class of frigate with Stockton using
his considerable political connections to grease the wheels. Finally, after the
succession to the Presidency by John Tyler, funds were allocated for a new
design. However, they only received funding for a 700-ton sloop instead of a
frigate. The sloop eventually became USS Princeton, named after Stockton's
hometown.
11. The ship took about three years to complete and was perhaps the most
advanced warship of its time. In addition to twin screw propellers, it was originally
designed to mount a 12-inch muzzle-loading gun on a revolving pedestal. The gun
had also been designed by Ericsson and used hoop construction to pre-tension the
breech, adding to its strength and allowing safe use of a larger charge. Other
innovations on the ship design included a collapsible funnel and an improved recoil
system.
The relations between Ericsson and Stockton had grown tense over time and,
approaching the completion of the ship, Stockton began working to force Ericsson
out of the project. Stockton carefully avoided letting outsiders know that Ericsson
was the primary inventor. Stockton attempted to claim as much credit for himself
as possible, even designing a second 12 in (300 mm) gun to be mounted in
Princeton. Unfortunately, because Stockton did not understand the design of the
first gun (originally named "The Orator", renamed "The Oregon" by Stockton), the
second gun was fatally flawed.
12. When launched, Princeton was an enormous success. On October 20, 1843,
she won a speed trial against the paddle steamer SS Great Western, until then
considered the fastest steamer afloat. Unfortunately, during a firing demonstration
of Stockton's gun, the breech ruptured, killing Secretary of State Abel P. Upshur
and Secretary of the Navy Thomas Walker Gilmer, as well as six others. Stockton
attempted to deflect the blame onto Ericsson, with moderate success, despite the
fact Ericsson's gun was sound and it was Stockton's gun that had failed. Stockton
also refused to pay Ericsson, and by using his political connections, Stockton
blocked the Navy from paying him.
Thomas Walker Gilmer (April 6, 1802 – February 28, 1844) was an
American statesman. He served in a number of political positions in
Virginia, including election as the 28th Governor of Virginia. Gilmer's final
political office was as the 15th Secretary of the Navy, but he died in an
accident ten days after assuming that position.
13. SS Great Western of 1838, was
a wooden-hulled paddle-wheel
steamship built of Dantzic pine, the
first steamship purpose-built for
crossing the Atlantic, and the initial
unit of the Great Western
Steamship Company. She was the
largest passenger ship in the world
from 1837 to 1839. Designed by
Isambard Kingdom Brunel, Great
Western proved satisfactory in
service and was the model for all
successful wooden Atlantic paddle-
steamers. She was capable of
making record Blue Riband voyages
as late as 1843. Great Western
worked to New York for 8 years until
her owners went out of business.
She was sold to the Royal Mail
Steam Packet Company and was
scrapped in 1856 after serving as a
troop ship during the Crimean War.[
14. Friendship with Cornelius H. DeLamater
When Ericsson arrived from England and settled in New York City, he was
persuaded by Samuel Risley of Greenwich Village to give his work to the Phoenix
Foundry. There he met industrialist Cornelius H. DeLamater (1821–1889) and soon
a mutual attachment developed between the two. Rarely thereafter did Ericsson or
DeLamater enter upon a business venture without first consulting the other.
Personally, their friendship never faltered, though strained by the pressures of
business and Ericsson's quick temper, DeLamater called Ericsson "John" and
Ericsson called DeLamater by his middle nickname "Harry", intimacies almost
unknown in Ericsson's other relationships. In time, the DeLamater Iron Works
became known as the Asylum where Capt Ericsson had free rein to experiment and
attempt new feats. The Iron Witch was next constructed, the first iron steamboat.
The first hot-air invention of Capt Ericsson was first introduced in the ship Ericsson,
built entirely by DeLamater. The DeLamater Iron Works also launched the first
submarine boat, first self-propelled torpedo, and first torpedo boat. When
DeLamater died on February 2, 1889, Ericsson could not be consoled. Ericsson's
death one month later was not surprising to his close friends and acquaintances
15. Hot air engine
Ericsson then proceeded to invent independently the caloric, or hot air, engine in the 1820s which
used hot air, caloric in the scientific parlance of the day, instead of steam as a propellant. A similar
device had been patented in 1816 by the Reverend Robert Stirling, whose technical priority of
invention provides the usual term 'Stirling Engine' for the device. Ericsson's engine was not initially
successful due to the differences in combustion temperatures between Swedish wood and British
coal. In spite of his setbacks, Ericsson was awarded the Rumford Prize of the American Academy of
Arts and Sciences in 1862 for his invention.
In 1830 Ericsson patented his second engine, that can work either with steam, air or water. This
rotative engine objective is to reduce the engine within more convenient limits without any
corresponding loss of power.
In 1833 Ericsson built his third engine, a hot air engine (or caloric engine) that is exhibited in London:
"the engine will prove the most important mechanical invention ever conceived by the human mind,
and one that will confer greater benefits on civilized life than any that has ever preceded it" (John O.
Sargent). This engine included a regenerator that would inspire many other hot air engine inventors.
17. A group of New York merchants and financiers headed by John B Kitching, Edward Dunham,
President of the Corn Exchange Bank, and G.B. Lamar, president of the Bank of the Republic,
backed the project and in April, 1852, the keel of the ship was laid at the yard of Perine, Patterson,
and Stack in Williamsburgh. At about the same time the construction of the engine was commenced
by Messrs Hogg and Delamater. Hull and machinery were built in the greatest possible secrecy, both
Ericsson and his financial backers being convinced that their ship would revolutionize ocean
transport by its economy and safety, and that competitors would if possible copy the design of at
least the engine. On September 15, 1852, the ship was launched and in November the engine was
turned over at the dock under its own power. It will be a failure. Smaller experimental engines based
on the same patent design and built before the caloric ship will prove to be working efficiently. In his
later years, the caloric engine would render Ericsson comfortably wealthy, as its boilerless design
made it a much safer and more practical means of power for small industry than steam engines.
Ericsson's incorporation of a 'regenerator' heat sink for his engine made it tremendously fuel-
efficient. Apparently in the post Civil War era some time before or around 1882, from the publishing
date, a ship was purchased by a Captain Charles L. Dingley called the Ericsson with a weight of
1,645 tons that was built by John Ericsson (Although the above section on John Ericsson's
Friendship with Cornelius H. DeLamater says that the ship known as the Ericsson was built by the
DeLamater Iron Works) to try out the hot air engine as a motive power in open ocean navigation
18. In 1883 John Ericsson built a solar air engine of 1 HP. The leading
feature of the sun motor is that of concentrating the radiant heat by means of a
rectangular trough having a curved bottom lined on the inside with polished plates,
so arranged that they reflect the sun's rays toward a cylindrical heater placed
longitudinally above the trough. This heater, it is scarcely necessary to state,
contains the acting medium, steam or air, employed to transfer the solar energy to
the motor; the transfer being effected by means of cylinders provided' with pistons
and valves resembling those of motive engines of the ordinary type. Practical
engineers, as well as scientists, have demonstrated that solar energy cannot be
rendered available for producing motive power, in consequence of the feebleness
of solar radiation.
Ship design
On September 26, 1854, Ericsson presented Napoleon III of France with drawings
of iron-clad armored battle ships with a dome-shaped gun tower, and even though
the French emperor praised this particular plan of an invention, he did nothing to
bring it to practical application. In 1851 he designed the Caloric ship Ericsson.
19. USS Monitor
Shortly after the American Civil War broke out in 1861, the Confederacy began
constructing an ironclad ram upon the hull of USS Merrimack which had been
partially burned and then sunk by Federal troops before it was captured by forces
loyal to the Commonwealth of Virginia. Nearly concurrently, the United States
Congress had recommended in August 1861 that armored ships be built for the
American Navy. Ericsson still had a dislike for the U.S. Navy, but he was
nevertheless convinced by Lincoln's hard-working Secretary of the Navy Gideon
Welles, and Cornelius Scranton Bushnell to submit an ironclad ship design to them.
Ericsson later presented drawings of USS Monitor, a novel design of armored ship
which included a rotating turret housing a pair of large cannons. Despite
controversy over the unique design, based on Swedish lumber rafts, the keel was
eventually laid down and the ironclad was launched on March 6, 1862. The ship
went from plans to launch in approximately 100 days, an amazing achievement.
20.
21.
22.
23.
24.
25.
26. On March 8, the former USS Merrimack, rechristened CSS Virginia, was
wreaking havoc on the wooden Union Blockading Squadron in Virginia, sinking USS
Congress and USS Cumberland. Monitor appeared the next day, initiating the first
battle between ironclad warships on March 9, 1862, at Hampton Roads, Virginia.
The battle ended in a tactical stalemate between the two ironclad warships, neither
of which appeared capable of sinking the other, but strategically saved the
remaining Union fleet from defeat. After this, numerous monitors were built for the
Union, including twin turret versions, and contributed greatly to the naval victory of
the Union over the rebellious states. Despite their low draft and subsequent
problems in navigating in high seas, many basic design elements of the Monitor
class were copied in future warships by other designers and navies. The rotating
turret in particular is considered one of the greatest technological advances in naval
history, still found on warships today.
28. Later designs
Later Ericsson designed other naval vessels and weapons, including a type of
torpedo and a destroyer, a torpedo boat that could fire a cannon from an
underwater port. He also provided some technical support for John Philip Holland
in his early submarine experiments. In the book Contributions to the Centennial
Exhibition (1877, reprinted 1976) he presented his "sun engines", which collected
solar heat for a hot air engine. One of these designs earned Ericsson additional
income after being converted to work as a methane gas engine.
John Philip Holland
29. Death and ensuing controversy
Ericsson died on March 8, 1889, the anniversary of the Battle of Hampton Roads, in
which his Monitor famously played a central role.[28]
The White Squadron's Farewell Salute to the Body of John Ericsson, New York Bay,
August 23, 1890
His wish to be buried in his native land sparked a series of articles in the New York
Times alleging that, by selecting the third-rate USS Essex (1874) to transport his
remains, the US Navy was not paying proper respect to Ericsson. The Navy
responded and sent the remains on the USS Baltimore, escorted by other ships
such as USS Nantucket. On August 23, 1890, the fleet departed with a twenty-one
gun salute and the Swedish flag hoisted on every ship of the squadron. Captain
Joseph Henderson was allotted the task to take the cruiser Baltimore safely out to
sea. Around 100,000 people turned out for the funeral procession and departure
ceremonies, including several veterans of the USS Monitor.
His final resting place is at Filipstad in Värmland, Sweden.
32. A photo of the Sölve monitor,
an armoured ship built in
1875 in Norrköping, Sweden,
by Ericsson-D'Ailly. It is
currently moored at the
Maritiman museum in
Gothenburg, Sweden.
33. Långban is a mining
area in Värmland in
Sweden. It belongs
to Filipstad
Municipality, with
the nearest city
being Filipstad, 21
km south. It was
systematically
mined through 1711-
1972, but has traces
from the 15th
century. It is the
birthplace of
Swedish-American
inventor John
Ericsson and his
brother Nils Ericson.