Eagle Pencil Company produced a wide variety of writing instruments. One was an interesting mechanical pencil named Simplex. It was cheap and came in several styles.
The Simplex has a patented, simple mechanism –
As the metal cylinder is screwed along the outside of the wooden body, a rod pushes the lead forward.
But there is also an older type of Simplex pencil that is completely different –
The lead is exposed by tearing off pieces of material around it. This is similar to Blaisdell’s paper pencils, which were patented a year earlier (1895).