Load-Bearing Walls, Steel Skeleton, Skyscrapers and Otis Safety Elevator

Posted by PITHOCRATES - May 22nd, 2013

Technology 101

Because there is no Elevator in a Brownstone the Lower Floors are more Valuable

If you live in Manhattan on the Upper West Side you may have a view of the Hudson River.  Depending on how high you live.  For the higher you are the better your view.  Which is why the best apartments are on the top floors of our high rises.  Interestingly, though, if you live in a 5-story brownstone the prime real estate in those buildings are on the lower floors.  Why?  Because they don’t have an elevator.

Early buildings had a limit on height.  Because they had load-bearing walls.  And as the buildings grew taller the walls grew thicker.  To support the weight of the buildings above them.  Consider the pyramid.  Large, tall structures made of stone.  Part of the reason why they were pyramid shape was the weight of these heavy stones.  Supporting these heavy stones above the ground required a wide stone base below them.  So as a building got taller the walls got thicker on the lower floors.  So thick that they had less useable space than the upper floors.

It’s also more difficult to put windows in load-bearing walls.  As an opening reduces the strength of those walls.  In your typical 5-story walkup brownstone you’ll have small window openings facing the street.  Making it hard to flood these spaces with natural light.  So buildings with load-bearing walls have a few drawbacks.  Thick walls shrink living space.  And reduce the amount of natural lighting.  Not to mention having to hoof it up all of those steps.  Which is why the lower floors are more valuable in a brownstone.  For no one wants to walk up and down 5 flights of stairs every time you leave the apartment.

With a Steel Skeleton replacing Thick Load-Bearing Walls we can Enclose a Building with Glass Curtain Walls

In the 19th century new building technologies addressed these problems.  Thanks to Henry Bessemer and his Bessemer process.  The first cost-effective way to produce large amounts of steel.  Steel is stronger than iron.  But early steel was brittle.  Because of a high carbon content.  So we used iron.  For our train rails.  And our boilers.  But we could not harden iron as much as steel.  Because of a lack of carbon in iron.  Which is why iron boilers had a tendency to explode.  And iron rails failed.

Henry Bessemer changed that.  By blowing oxygen through the molten steel.  Which removed impurities.  And excess carbon.  Andrew Carnegie used the Bessemer process on a grand scale.  Producing the steel that built America.  Mass producing the structural steel that changed the way we built buildings.  Bringing the word ‘skyscraper’ into the lexicon of building.  As Carnegie’s steel sent our buildings soaring to the sky.

Instead of building thick load-bearing walls we built a rigid steel skeleton.  We anchored it to the earth with some steel-reinforced concrete piers deep underground.  And steel piles driven down to bedrock.  Giving us a tall, sturdy structure to build around.  The structure being so strong we can support up to a hundred (or more) concrete floors from it.  With useable space on every floor.  And without thick load-bearing walls we can hang glass curtain walls from this steel skeleton.  Wrapping the exterior of the building in glass.  Flooding these floors with natural light.

Before Elisha Otis and Andrew Carnegie the Top Floor of any Building was the Hardest to Let

So the steel skeleton allowed us to build buildings taller than ever.  But it took something else to allow those buildings to reach skyward.  For people were just not going to walk up and down a hundred flights of stairs every time they left their home or office.  They may walk up and down 5 flights of stairs in exchange for a cheaper rent in a brownstone on the Upper West Side.  But no one is going to walk up and down a hundred flights.  Even if they don’t have to pay rent.  So it was the elevator that really allowed today’s skyscraper.  Tiny little cars suspended by a few cables in a very long vertical shaft.

Elevator safety evolved over time.  At first it was not that uncommon for people to fall to their death in an elevator car that broke free from its cables.  Elisha Otis solved that problem.  He attached the elevator cable to a flat-leaf spring attached to the car.  The tension on the cable from the weight of the elevator car compressed the flat-leaf spring.  Drawing in mechanical linkages.  If the cable broke the energy in the compressed spring released and pushed down on the mechanical linkages.  Which forced arms outward and into saw-tooth safety rails that ran the length of the elevator shaft.  Bringing the elevator car to an immediate stop if the cable broke.

This revolutionized elevators.  And allowed our buildings to reach skyward.  As people no longer feared getting into an elevator.  Thanks to Elisha Otis.  Who went on to found the Otis Elevator Company.  If you see the word ‘Otis’ in the elevator car you’re in you can thank Elisha Otis.  For you’re in one of his elevators.  And you can thank Andrew Carnegie.  For giving us tall buildings.  And whose company may have even built the steel of the building you’re in.  Before Otis and Carnegie the top floor of any building was the hardest to let.  Because no one wanted to climb up all of those stairs.  But with tall steel and a safe elevator the top floor in a building now commands the highest rent.  Because of the view.  And the ease at which we could enjoy that view.

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Iron, Steel, the Steam Engine, Railroads, the Bessemer Process, Andrew Carnegie and the Lucy Furnace

Posted by PITHOCRATES - November 21st, 2012

(Originally published December 14, 2011)

With the Steam Engine we could Build Factories Anywhere and Connect them by Railroads

Iron has been around for a long time.  The Romans used it.  And so did the British centuries later.  They kicked off the Industrial Revolution with iron.  And ended it with steel.  Which was nothing to sneeze at.  For the transition from iron to steel changed the world.  And the United States.  For it was steel that made the United States the dominant economy in the world.

The Romans mined coal in England and Wales.  Used it as a fuel for ovens to dry grain.  And for smelting iron ore.  After the Western Roman Empire collapsed, so did the need for coal.  But it came back.  And the demand was greater than ever.  Finding coal, though, required deeper holes.  Below the water table.  And holes below the water table tended to fill up with water.  To get to the coal, then, you had to pump out the water.  They tried different methods.  But the one that really did the trick was James Watt’s steam engine attached to a pump.

The steam engine was a game changer.  For the first time man could make energy anywhere he wanted.  He didn’t have to find running water to turn a waterwheel.  Depend on the winds.  Or animal power.  With the steam engine he could build a factory anywhere.  And connect these factories together with iron tracks.  On which a steam-powered locomotive could travel.  Ironically, the steam engine burned the very thing James Watt designed it to help mine.  Coal.

Andrew Carnegie made Steel so Inexpensive and Plentiful that he Built America

Iron was strong.  But steel was stronger.  And was the metal of choice.  Unfortunately it was more difficult to make.  So there wasn’t a lot of it around.  Making it expensive.  Unlike iron.  Which was easier to make.  You heated up (smelted) iron ore to burn off the stuff that wasn’t iron from the ore.  Giving you pig iron.  Named for the resulting shape at the end of the smelting process.  When the molten iron was poured into a mold.  There was a line down the center where the molten metal flowed.  And then branched off to fill up ingots.  When it cooled it looked like piglets suckling their mother.  Hence pig iron.

Pig iron had a high carbon content which made it brittle and unusable.  Further processing reduced the carbon content and produced wrought iron.  Which was usable.  And the dominate metal we used until steel.  But to get to steel we needed a better way of removing the residual carbon from the iron ore smelting process.  Something Henry Bessemer discovered.  Which we know as the Bessemer process.  Bessemer mass-produced steel in England by removing the impurities from pig iron by oxidizing them.  And he did this by blowing air through the molten iron.

Andrew Carnegie became a telegraph operator at Pennsylvania Railroad Company.  He excelled, moved up through the company and learned the railroad business.  He used his connections to invest in railroad related industries.  Iron.  Bridges.  And Rails.  He became rich.  He formed a bridge company.  And an ironworks.  Traveling in Europe he saw the Bessemer process.  Impressed, he took that technology and created the Lucy furnace.  Named after his wife.  And changed the world.  His passion to constantly reduce costs led him to vertical integration.  Owning and controlling the supply of raw materials that fed his industries.  He made steel so inexpensive and plentiful that he built America.  Railroads, bridges and skyscrapers exploded across America.  Cities and industries connected by steel tracks.  On which steam locomotives traveled.  Fueled by coal.  And transporting coal.  As well as other raw materials.  Including the finished goods they made.  Making America the new industrial and economic superpower in the world.

Knowing the Market Price of Steel Carnegie reduced his Costs of Production to sell his Steel below that Price

Andrew Carnegie became a rich man because of capitalism.  He lived during great times.  When entrepreneurs could create and produce with minimal government interference.  Which is why the United States became the dominant industrial and economic superpower.

The market set the price of steel.  Not a government bureaucrat.  This is key in capitalism.  Carnegie didn’t count labor inputs to determine the price of his steel.  No.  Instead, knowing the market price of steel he did everything in his powers to reduce his costs of production so he could sell his steel below that price.  Giving steel users less expensive steel.  Which was good for steel users.  As well as everyone else.  But he did this while still making great profits.  Everyone was a winner.  Except those who sold steel at higher prices who could no longer compete.

Carnegie spent part of his life accumulating great wealth.  And he spent the latter part of his life giving that wealth away.  He was one of the great philanthropists of all time.  Thanks to capitalism.  The entrepreneurial spirit.  And the American dream.  Which is individual liberty.  That freedom to create and produce.  Like Carnegie did.  Just as entrepreneurs everywhere have been during since we allowed them to profit from risk taking.

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Iron, Steel, the Steam Engine, Railroads, the Bessemer Process, Andrew Carnegie and the Lucy Furnace

Posted by PITHOCRATES - December 14th, 2011

Technology 101

With the Steam Engine we could Build Factories Anywhere and Connect them by Railroads

Iron has been around for a long time.  The Romans used it.  And so did the British centuries later.  They kicked off the Industrial Revolution with iron.  And ended it with steel.  Which was nothing to sneeze at.  For the transition from iron to steel changed the world.  And the United States.  For it was steel that made the United States the dominant economy in the world.

The Romans mined coal in England and Wales.  Used it as a fuel for ovens to dry grain.  And for smelting iron ore.  After the Western Roman Empire collapsed, so did the need for coal.  But it came back.  And the demand was greater than ever.  Finding coal, though, required deeper holes.  Below the water table.  And holes below the water table tended to fill up with water.  To get to the coal, then, you had to pump out the water.  They tried different methods.  But the one that really did the trick was James Watt’s steam engine attached to a pump.

The steam engine was a game changer.  For the first time man could make energy anywhere he wanted.  He didn’t have to find running water to turn a waterwheel.  Depend on the winds.  Or animal power.  With the steam engine he could build a factory anywhere.  And connect these factories together with iron tracks.  On which a steam-powered locomotive could travel.  Ironically, the steam engine burned the very thing James Watt designed it to help mine.  Coal.

Andrew Carnegie made Steel so Inexpensive and Plentiful that he Built America

Iron was strong.  But steel was stronger.  And was the metal of choice.  Unfortunately it was more difficult to make.  So there wasn’t a lot of it around.  Making it expensive.  Unlike iron.  Which was easier to make.  You heated up (smelted) iron ore to burn off the stuff that wasn’t iron from the ore.  Giving you pig iron.  Named for the resulting shape at the end of the smelting process.  When the molten iron was poured into a mold.  There was a line down the center where the molten metal flowed.  And then branched off to fill up ingots.  When it cooled it looked like piglets suckling their mother.  Hence pig iron.

Pig iron had a high carbon content which made it brittle and unusable.  Further processing reduced the carbon content and produced wrought iron.  Which was usable.  And the dominate metal we used until steel.  But to get to steel we needed a better way of removing the residual carbon from the iron ore smelting process.  Something Henry Bessemer discovered.  Which we know as the Bessemer process.  Bessemer mass-produced steel in England by removing the impurities from pig iron by oxidizing them.  And he did this by blowing air through the molten iron.

Andrew Carnegie became a telegraph operator at Pennsylvania Railroad Company.  He excelled, moved up through the company and learned the railroad business.  He used his connections to invest in railroad related industries.  Iron.  Bridges.  And Rails.  He became rich.  He formed a bridge company.  And an ironworks.  Traveling in Europe he saw the Bessemer process.  Impressed, he took that technology and created the Lucy furnace.  Named after his wife.  And changed the world.  His passion to constantly reduce costs led him to vertical integration.  Owning and controlling the supply of raw materials that fed his industries.  He made steel so inexpensive and plentiful that he built America.  Railroads, bridges and skyscrapers exploded across America.  Cities and industries connected by steel tracks.  On which steam locomotives traveled.  Fueled by coal.  And transporting coal.  As well as other raw materials.  Including the finished goods they made.  Making America the new industrial and economic superpower in the world.

Knowing the Market Price of Steel Carnegie reduced his Costs of Production to sell his Steel below that Price

Andrew Carnegie became a rich man because of capitalism.  He lived during great times.  When entrepreneurs could create and produce with minimal government interference.  Which is why the United States became the dominant industrial and economic superpower.

The market set the price of steel.  Not a government bureaucrat.  This is key in capitalism.  Carnegie didn’t count labor inputs to determine the price of his steel.  No.  Instead, knowing the market price of steel he did everything in his powers to reduce his costs of production so he could sell his steel below that price.  Giving steel users less expensive steel.  Which was good for steel users.  As well as everyone else.  But he did this while still making great profits.  Everyone was a winner.  Except those who sold steel at higher prices who could no longer compete.

Carnegie spent part of his life accumulating great wealth.  And he spent the latter part of his life giving that wealth away.  He was one of the great philanthropists of all time.  Thanks to capitalism.  The entrepreneurial spirit.  And the American dream.  Which is individual liberty.  That freedom to create and produce.  Like Carnegie did.  Just as entrepreneurs everywhere have been during since we allowed them to profit from risk taking.

www.PITHOCRATES.com

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