The illustrations depict how three distinct kinds of bridges, namely arch, concrete girder, and suspension, are constructed.
Overall, it is perceptible that the arch bridge possesses the most basic structure, compared to its counterparts which see a much more complex one. Regarding their sizes, unlike the concrete girder bridge whose length depends on piers, the suspension bridge constitutes the highest figure in its length and height, while the arch bridge observes the reserve figure.
Looking in more detail, the arch and suspension bridge witnesses the most common and basic constructions. Regarding the former, it only observes a less than 100-height length and 200-metre length, far following that of the latter bridge whose figures are larger than four to twentyfold ( 400-2000 metres in length and a very deep width). Due to the differences in sizes, the arch bridge only aligns with a lake and a small ship beneath it, whereas the suspension is built just above a very deep sea with a large size ship. Additionally, two piers are situated in each of the bridge in order to ensure that the bridge will not break as well, making it possible for vehicles to travel through it. By contrast, the arch bridge has nothing on its surface.
When it comes to the remaining bridge, it seems to be designated as a railway for trains to run through. To ensure for the sustainability of the bridge, linear piers, whose length accounts for less than 300 metres, are constructed vertically by less than 200 metres right under its surface. As for that limited height, the concrete girder bridge is built to move through a river which is able to consist of a middle size ship.