I am not aware of who invented the erasable pen but Sir Walter McHenery, an Irish physicist, invented an ink that would disappear when held over heat in 1827.
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the felt tip pen was invented in the 1940s
Charles Lutwidge Dodgson used the name Lewis Carroll as a pen name. He is the one who invented the Carroll diagram, sometimes referred to as Lewis Carroll's square. It is a diagram used for grouping things in a yes or no fashion.
Easy shading and it's erasable unlike paint or ink which would be permanent. so if you mess up with anything besides a pencil, you have to start over.
At first it was a quill, (feather with a pointy tip and ink on it) now its, well, a pen
artemio ricarte