A French artillery officer,
Nicholas Joseph Cugnot, built and ran a 3 wheeled carriage powered by a
steam engine in 1769, but which ran off the road the first time it went
into a curve at its full speed--3 miles and hour. It was the
first self-propelled highway vehicle, but it was no improvement over
the horse.
Some steam powered busses
were actually used commercially in England in the first half of the
19th century, but once the railroad took off it was clearly superior.
The railroad and stagecoach
industries succeeded in having a law passed to stop these in 1865
(repealed 1896)--on the ground of the dangers of frightening horses
self-propelled vehicles on public highways were limited to a speed of 4
miles an hour and had to be preceded by a man on foot carrying a red
flag
People by the late 1700s had begun to dream that machines would free us
from our limitations--allow us to fly or at least go fast
Why did speed become so appealing? (it isn't just human
nature, it appears
as a strong value at a particular time)
Steam boats were the first practical steam vehicles
Steam Boats:
experiments as early as 1780s both in England and
American, but the need was greater in America.
a lot of varied speculation, including an 1785
paper by Benjamin Franklin in which he concluded that paddlewheels were
inefficient and proposed jet propulsion.
This put John Fitch on the wrong track--his
mechanic convinced him not to try water jets but he worked on crank and
paddles
instead of paddle wheels. he did demonstrate a boat in 1787 and
run boats on the Mississippi in a commercial operation as early as
1790, although he ultimately failed.
Robert Fulton trained in England and France (he
had gone to London originally to study art but ended up studying civil
engineering). He built his first commercially successful
steamboat for the Hudson starting operation in 1807 (with a promise of
a 20 year monopoly from the NY legislature) with a 133 ft. boat called
the Clermont
with twin sidewheels. He used a Watt
engine and built his boats for passenger comfort and speed.
He also ran boats on the Mississippi, but they
didn't do very well.
Other engineers solved the problems of adaptating
the steam boat to western
conditions.
The key innovation was the high-pressure steam
engine invented by Oliver Evans in 1801. Dominated western
steamboats because less fouled by muddy water.
Gradual development of shallow hull and flat
bottom, upper decks, horizontal engine (easier to connect to a stern
paddlewheel) examples
Extremely profitable--sometimes 100% a
trip. Henry Shreve did the best job of putting all these
innovation together and also invented the snagboat .
clearing
snags
The steam boat was the first time the United
States took the lead in developing a major new technology
The high pressure engine made possible steam powered railway locomotives
The railroad in England:
Rails are a much earlier innovation than
locomotives: horsedrawn carts on wooden rails used in Germany
since
16th century, in England since 17th century. Iron rails about 1770
mostly these were mine railroads, but by end of
1825 there were 300-400 miles of iron public railroad
the idea of a moving steam engine was obvious,
but there were problems.
need for high pressure steam engines
widespread belief that there would not be
enough friction, that rise would have to be less than 1 foot per 100
experiments with steam carriages--eg. Cugnot
in France in 1770--had led to English laws to keep steam carriages from
scaring horses by requiring a man walking in front of it with a flag or
lantern
early experiments on mine (colliery) railways
Penydarren Locomotive
First experimental locomotive built by Richard
Trevithick in 1803-4 for the 10 mile Penydarren
colliery railway . One cylinder, 8 1/2 inches in diamter, 4
1/2 foot stroke, probably 30-50 lb/sq in. working pressure. It
was too heavy for the track so the owners used it as a stationary
engine.
Trevithick tried again in 1805 with no more
success, went to South American in disgust
by 1812 similar locomotives started to be used
on colliery railroads (in the north of England--Leeds and on Tyneside)
between mine and warf. Economical because Napoleonic wars
increased price of animal feed.
Locomotives on common carriers
1825 Stockton & Darlington RR--built by George
Stephenson using colliery railway
technology. 25 miles long, first public railroad built to use
steam, but horses were often substituted. Not a convincing trial.
Builders of Liverpool-Manchester railroad
were locked in a debate over whether to use horses or
locomotives. Decided to sponsor a contest to see if locomotives
were practical at all and pick the best design
held Oct. 1829.
Contest was to
pull 20 tons at 10 mph and make 40 trips over a 1 1/2 mile course.
10 entries were expected but only three
appeared--Timoth Hackworth, engineer of the Stockton and Darlington RR
entered the Sans
Pareil, John Braithwaite and John Ericsson
entered the Novelty
(which had the advantage of being a
particularly light weight design), and Robert Stephenson entered the Rocket
(animation).
Sans Pareil failed to complete the
course, Novelty also broke down, but Rocket not only
completed the course but averaged 15 mph, winning the 500 pound prize
More important this convinced people of the
practicality of locomotives. It was a major spectator sport--more
than 10,000 people saw the trials
Liverpool-Manchester
builders ordered seven
locomotives. They built their rails to the gauge of Stephenson's
locomotive--the 4 ft. 8 1/2 inch gauge of the Killingworth Colliery
Wagonway. That is still the standard gauge today.
This competed for the first time with canals,
since it connected an industrial center with its port. Canal
interesters tried to block its building in Pariament. Speed was
the key advantage--unexpectedly 1/2 of revenue came from passengers.
England saw a railway boom 1831-37. 400-500
miles opened to traffic for a total of 1331 miles by 1840. After
a lull from 1839 to 1843 the boom turned into a mania--2000 miles
opened to traffic 1844-1847. In 1847 more than 1/4 million men
were employed in constructing 6,455 miles of railways, with a total
expenditure on railways about 10% of national income.