Dear teacher,
The invention of the ballpoint pen made the simple act of writing much easier. People no longer had to waste time filling their pens or rewriting things that got blotched or rewriting because their fountain pen had ripped their paper. It was for you attempt to make a writing instrument that would be able to write "on rough surfaces-such as wood, coarse wrapping-paper, and other articles" which then-common fountain pens could not. The goal of a ball point pen is to create a device that can distribute a fast-drying thick ink, without having the ink dry out in the pen itself. The key is the ball. The ball acts as: A continuous cap that keeps the ink from drying.
Sincerely student
