The introduction of so powerful an agent as steam [to a carriage on wheels] will make a great change in the situation of man.
![The introduction of so powerful an agent as steam [to a carriage on wheels] will make a great change in the situation of man.](http://cdn.quoteddaily.com/images/thomas-jefferson/the-introduction-of-so-powerful-an-agent-as-steam-to-a-carriage-on-wheels-will-make-a-great-change-in.jpg)
The introduction of so powerful an agent as steam [to a carriage on wheels] will make a great change in the situation of man.