techarchive

Edison's electric pen (1875)

One of the first consumer products to use an electric motor.

When someone wrote with it, a needle moved up and down to create a stencil. Then the stencil was put into a separate press, and ink was rolled through it to make copies of the handwritten document.

Mathematics/Design ⟢⟢ᚖ⟡⟡ᚖ⟡⟡ᚖ⟡⟡ᚖ⟡⟡ᚖ⟡⟡ᚖ⟡⟡ᚖ⟡⟡ᚖ⟡⟡ᚖ⟣⟣

Text art: linktr.ee/sinusoidalsnail

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Yupppp. What’s wild to me, is that ballpoints pen didn’t get invented until like 60 years after this thing 🤯