Bridges and their history. The Romans were the best bridge builders in the ancient world; they used their bridges for slavery and to get across rivers. but some people didn’t have the resources that the romans did. The han dynasty had to build bridges out of vines and wood and then the Tibetan monks said that chains are better so people started to use chains instead of vines. James Finely born in 1756, he was good at math and engineering, he wanted to build a cheep bridge that could be built anywhere not just one kind of place. James had an idea of a suspension bridge for a 600 dollar budget, it could be built anywhere and its cheaper than a 2500 dollar bridge and its easier to cross than the other bridges. Suspension bridges are heavier than all the other bridges and made of good resources which makes it stronger.

Fire hydrants and their history. The first way to put out fire was was the the sewers they also had water in elk tree’s which were the things that people used in the ancient world to put out fires. then people were using other kinds of ways to put out fires then they came up with the idea of the fire hydrants where you’d have to dig down to the pipe to activate the fire hydrant. Then there was an easier solution to crank to open the fire hydrant. One time a fire lit up a neighborhood and then while all of the fire hydrants were losing water this one fire hydrant still had water flowing and it saved the neighborhood then people started to call it the golden fire hydrant and they paint it gold every year.

Locomotives and their history. Locomotives are what makes a trains work but some locomotives don’t work sometimes the locomotives malfunction which could lead to them blow up or getting stuck. this one time Richard Trevithick inventions the devils puffer blew up he said to reconstruct it but his creation couldn’t. Other countries in Europe caught up with the trains and railroads this was a fast way of transporting resources and getting rich. Before people used to use horses to transport resources which would take forever and sometimes the resources wouldn’t even get there.