1. How new modern materials prompted changes in architecture in the late nineteenth century in reference to the construction of the Crystal Palace or Eiffel Tower. After the Baroque faded slowly away, eighteenth-century architecture consisted primarily of revivals of previous periods. This time was to be the calm before the storm, for the approaching Industrial Revolution was to change everything about the world as it was then, including architecture. Previously, building materials had been restricted to a few manmade materials along with those available in nature: timber, stone, timber, lime mortar, and concrete. Metals were not available in sufficient quantity or consistent quality to be used as anything more than ornamentation. Structure was limited by the capabilities of natural materials. The Industrial Revolution changed this situation dramatically. In 1800, the worldwide tonnage of iron produced was 825,000 tons. By 1900, with the Industrial Revolution in full swing, worldwide production stood at 40 million tons, almost 50 times as much. Iron was available in three forms. The least processed form, cast iron, was brittle due to a high percentage of impurities. It still displayed impressive compressive strength, however. Wrought iron was a more refined form of iron, malleable, though with low tensile strength. Steel was the strongest, most versatile form of iron. Through a conversion process, all of the impurities were burned out of the iron ore, then precise amounts of carbon were added for hardness. Steel had tensile and compressive strength greater than any material previously available, and its capabilities would revolutionize architecture. This change did not happen over night. Prior to the introduction of bulk iron, architecture relied on compressive strength to hold buildings up. Even great structures like the Chartres Cathedral or the Parthenon were essentially orderly piles of stone. Architects were accustomed to thinking of certain ways of creating structure, and though they glimpsed some of the possibilities of the new materials, the first applications were made using the old ideas. The explosion in the development of iron and steel structures was driven initially by the advance of the railroads. Bridges were required to span gorges and rivers. In 1779, the first iron bridge was built across the Severn River in Coalescence, England. It was not an iron bridge as we might conceive of it today, but rather a traditional arch made of iron instead of stone. The compressive strength of limestone is 20 tons per square foot. The compressive strength of cast iron is 10 tons per square inch, 72 times as high, permitting significantly larger spans. Later, the truss, long used in timber roofs, became the primary element of bridge building. A triangle is the strongest structural element known, and applied force only makes it more stable. When a diagonal is added to a square, the form can be viewed as two triangles sharing a side, the fundam.

1. 1. How new modern materials prompted changes in architecture in the late nineteenth century in
reference to the construction of the Crystal Palace or Eiffel Tower.
After the Baroque faded slowly away, eighteenth-century architecture consisted primarily of
revivals of previous periods. This time was to be the calm before the storm, for the approaching
Industrial Revolution was to change everything about the world as it was then, including
architecture. Previously, building materials had been restricted to a few manmade materials
along with those available in nature: timber, stone, timber, lime mortar, and concrete. Metals
were not available in sufficient quantity or consistent quality to be used as anything more than
ornamentation. Structure was limited by the capabilities of natural materials. The Industrial
Revolution changed this situation dramatically.
In 1800, the worldwide tonnage of iron produced was 825,000 tons. By 1900, with the Industrial
Revolution in full swing, worldwide production stood at 40 million tons, almost 50 times as
much. Iron was available in three forms. The least processed form, cast iron, was brittle due to a
high percentage of impurities. It still displayed impressive compressive strength, however.
Wrought iron was a more refined form of iron, malleable, though with low tensile strength. Steel
was the strongest, most versatile form of iron. Through a conversion process, all of the impurities
were burned out of the iron ore, then precise amounts of carbon were added for hardness. Steel
had tensile and compressive strength greater than any material previously available, and its
capabilities would revolutionize architecture.
This change did not happen over night. Prior to the introduction of bulk iron, architecture relied
on compressive strength to hold buildings up. Even great structures like the Chartres Cathedral
or the Parthenon were essentially orderly piles of stone. Architects were accustomed to thinking
of certain ways of creating structure, and though they glimpsed some of the possibilities of the
new materials, the first applications were made using the old ideas.
The explosion in the development of iron and steel structures was driven initially by the advance
of the railroads. Bridges were required to span gorges and rivers. In 1779, the first iron bridge
was built across the Severn River in Coalescence, England. It was not an iron bridge as we might
conceive of it today, but rather a traditional arch made of iron instead of stone. The compressive
strength of limestone is 20 tons per square foot. The compressive strength of cast iron is 10 tons
per square inch, 72 times as high, permitting significantly larger spans. Later, the truss, long used
in timber roofs, became the primary element of bridge building. A triangle is the strongest
structural element known, and applied force only makes it more stable. When a diagonal is added
to a square, the form can be viewed as two triangles sharing a side, the fundamental element of a
truss. Trusses were used to build bridges of unprecedented strength throughout the nineteenth
century, including cantilever bridges consisting of truss complexes balanced on supporting piers.

2. A third, more attractive type of steel bridge was the suspension bridge, in which the roadway is
hung from steel cables strung from supporting towers in giant catenary arcs.
As with bridges, some of the first structural advances using steel were prompted by the
railroads. Trains required bridges and rails to get them where they were going, but once there,
they required a depot and storage sheds. These sheds had to be of an unprecedented scale, large
enough to enclose several tracks and high enough to allow smoke and fumes to dissipate. Trusses
spanned the open area of the tracks, creating a steel skeleton hung with steel-framed glass panes.
The structures were extraordinarily light and open. Some of the sheds were huge, such as St.
Pancras Station, London, England. To the people of the nineteenth century these sheds were
breathtaking, the largest contiguous enclosed space the world had ever seen.
At this point the capabilities of iron and steel had been proven and it was natural to extend the
idea to another utilitarian application—factories. The first iron frame factory was built in 1796-
97 in Shrewsbury, England, followed rapidly by a seven story cotton mill with cast iron columns
and ceiling beams. Wrought iron beams were developed in 1850, a significant advance over
brittle cast iron versions.
The new materials were not just used as skeletal elements. In the 1850s, 1860s, and 1870s, cast
iron was used as a facade treatment, especially in the Soho district of New York City. Buildings
such as the Milan Galleria, an indoor shopping area, and the Bibliotheque Nationale in Paris used
iron as an internal structural and decorative element. In 1851, the Crystal Palace was built for the
London Exposition, truly the Chartres Cathedral of its time. In 1889, Gustav Eiffel built the
Eiffel Tower for the Exposition Universelle in Paris, initially the target of harsh criticism and
now the symbol of Paris.
The Industrial Revolution provided more than just ferrous building materials. A stronger, more
durable and fire resistant type of cement called Portland Cement was developed in 1824. The
new material was still limited by low tensile strength, however, and could not be used in many
structural applications. By a stroke of good fortune, the thermal expansion properties of the new
cement were almost identical to those of iron and steel. In a creative leap, nineteenth century
builders came up with the idea of reinforced concrete. Though expensive, iron and steel had high
tensile strength and could be easily formed into long, thin bars. Enclosed in cheap, easily formed
concrete, the bars were protected from fire and weather. The result was a strong, economical,
easily produced structural member that could take almost any form imaginable, including
columns, beams, arches, vaults, and decorative elements. It is still one of the most common
building materials used today.
2. Why Rodhin is Important in advance ment of modern art?
In the 1860s, when Rodin began making sculpture, art was deeply rooted in the past it told
stories from religion, history, myth, and literature, and it told them as if the artist had been a

3. witness to the events. Just thirty years later, by the peak of his career the 1890s Rodin had
transformed sculpture into something that today we call modern, that spoke to the artist’s and
viewer’s emotions and imaginations. The stories that were told were often internal and
conceptual, and there was no right or wrong way to interpret them. And by the time Rodin died
in 1917 he had through prodigious talent and a remarkable volume of work challenged the
established styles of his youth and revolutionized sculpture. Today his pioneering work is a
crucial link between traditional and modern art.
Solution
1. How new modern materials prompted changes in architecture in the late nineteenth century in
reference to the construction of the Crystal Palace or Eiffel Tower.
After the Baroque faded slowly away, eighteenth-century architecture consisted primarily of
revivals of previous periods. This time was to be the calm before the storm, for the approaching
Industrial Revolution was to change everything about the world as it was then, including
architecture. Previously, building materials had been restricted to a few manmade materials
along with those available in nature: timber, stone, timber, lime mortar, and concrete. Metals
were not available in sufficient quantity or consistent quality to be used as anything more than
ornamentation. Structure was limited by the capabilities of natural materials. The Industrial
Revolution changed this situation dramatically.
In 1800, the worldwide tonnage of iron produced was 825,000 tons. By 1900, with the Industrial
Revolution in full swing, worldwide production stood at 40 million tons, almost 50 times as
much. Iron was available in three forms. The least processed form, cast iron, was brittle due to a
high percentage of impurities. It still displayed impressive compressive strength, however.
Wrought iron was a more refined form of iron, malleable, though with low tensile strength. Steel
was the strongest, most versatile form of iron. Through a conversion process, all of the impurities
were burned out of the iron ore, then precise amounts of carbon were added for hardness. Steel
had tensile and compressive strength greater than any material previously available, and its
capabilities would revolutionize architecture.
This change did not happen over night. Prior to the introduction of bulk iron, architecture relied
on compressive strength to hold buildings up. Even great structures like the Chartres Cathedral
or the Parthenon were essentially orderly piles of stone. Architects were accustomed to thinking
of certain ways of creating structure, and though they glimpsed some of the possibilities of the
new materials, the first applications were made using the old ideas.
The explosion in the development of iron and steel structures was driven initially by the advance
of the railroads. Bridges were required to span gorges and rivers. In 1779, the first iron bridge

4. was built across the Severn River in Coalescence, England. It was not an iron bridge as we might
conceive of it today, but rather a traditional arch made of iron instead of stone. The compressive
strength of limestone is 20 tons per square foot. The compressive strength of cast iron is 10 tons
per square inch, 72 times as high, permitting significantly larger spans. Later, the truss, long used
in timber roofs, became the primary element of bridge building. A triangle is the strongest
structural element known, and applied force only makes it more stable. When a diagonal is added
to a square, the form can be viewed as two triangles sharing a side, the fundamental element of a
truss. Trusses were used to build bridges of unprecedented strength throughout the nineteenth
century, including cantilever bridges consisting of truss complexes balanced on supporting piers.
A third, more attractive type of steel bridge was the suspension bridge, in which the roadway is
hung from steel cables strung from supporting towers in giant catenary arcs.
As with bridges, some of the first structural advances using steel were prompted by the
railroads. Trains required bridges and rails to get them where they were going, but once there,
they required a depot and storage sheds. These sheds had to be of an unprecedented scale, large
enough to enclose several tracks and high enough to allow smoke and fumes to dissipate. Trusses
spanned the open area of the tracks, creating a steel skeleton hung with steel-framed glass panes.
The structures were extraordinarily light and open. Some of the sheds were huge, such as St.
Pancras Station, London, England. To the people of the nineteenth century these sheds were
breathtaking, the largest contiguous enclosed space the world had ever seen.
At this point the capabilities of iron and steel had been proven and it was natural to extend the
idea to another utilitarian application—factories. The first iron frame factory was built in 1796-
97 in Shrewsbury, England, followed rapidly by a seven story cotton mill with cast iron columns
and ceiling beams. Wrought iron beams were developed in 1850, a significant advance over
brittle cast iron versions.
The new materials were not just used as skeletal elements. In the 1850s, 1860s, and 1870s, cast
iron was used as a facade treatment, especially in the Soho district of New York City. Buildings
such as the Milan Galleria, an indoor shopping area, and the Bibliotheque Nationale in Paris used
iron as an internal structural and decorative element. In 1851, the Crystal Palace was built for the
London Exposition, truly the Chartres Cathedral of its time. In 1889, Gustav Eiffel built the
Eiffel Tower for the Exposition Universelle in Paris, initially the target of harsh criticism and
now the symbol of Paris.
The Industrial Revolution provided more than just ferrous building materials. A stronger, more
durable and fire resistant type of cement called Portland Cement was developed in 1824. The
new material was still limited by low tensile strength, however, and could not be used in many
structural applications. By a stroke of good fortune, the thermal expansion properties of the new
cement were almost identical to those of iron and steel. In a creative leap, nineteenth century

5. builders came up with the idea of reinforced concrete. Though expensive, iron and steel had high
tensile strength and could be easily formed into long, thin bars. Enclosed in cheap, easily formed
concrete, the bars were protected from fire and weather. The result was a strong, economical,
easily produced structural member that could take almost any form imaginable, including
columns, beams, arches, vaults, and decorative elements. It is still one of the most common
building materials used today.
2. Why Rodhin is Important in advance ment of modern art?
In the 1860s, when Rodin began making sculpture, art was deeply rooted in the past it told
stories from religion, history, myth, and literature, and it told them as if the artist had been a
witness to the events. Just thirty years later, by the peak of his career the 1890s Rodin had
transformed sculpture into something that today we call modern, that spoke to the artist’s and
viewer’s emotions and imaginations. The stories that were told were often internal and
conceptual, and there was no right or wrong way to interpret them. And by the time Rodin died
in 1917 he had through prodigious talent and a remarkable volume of work challenged the
established styles of his youth and revolutionized sculpture. Today his pioneering work is a
crucial link between traditional and modern art.