Around 1880's steel prices droped and reinforced concrete was developed. This caused buildings to be built at a lot faster pace. The Bahaus and other such movements barely recognized the tradition of structural art. Transportation like canals, roads, and railways speed up the technology develepments, leading to urbinazation and further industrial change.Higher buildings apeared as the cities get crowded, train termioanls with longer spans and larger bridges becmoe more feasible. .
Billingotn also describes the three dimensions of structure and architecture. He says that there is a seperation between architects and engineers because it is though that engineers are the ones doin the mechanical or electrical aspects of architecture ,but the architestural shapes have come form stryuctural engineers. Engineers also have to make their bridges and building aesthetic, which proves that the two subjects can't be seperated. The first dimension of structure is that each structure or machine has to perform in accordinance with nature, making it natural. The use of materials and it's strenght is important here.The second one is that the structures formed have to be accepted by the society that it exists in.It should be enonomical and benificial to the society it lives in. The third dimension of structure is the symbolic , which means that the structure has to be aesthetical pleasing and elegant. Billington mentioned .
Both Maillart and Othmar Ammann as structural artist who were able to combine all three of these parts in their desings of bridges. They al;so acheved this without the use of computers which speed up the design process, but might also decrease the quality of design. Billington then focused on the Iron Age.
The main material during the Industrial Revolution was iron. Wood was replaced by coal I iron making, and also iron took over construction form wood. Iron Bridge 1779, which was built by Abraham Darby III represents the rise of iron in the eighteenth century.