According to legend, the Greek engineer Archimedes of Syracuse designed a pump that moved water up by using a screw inside a sealed shaft. The Evans lever-action rifle, designed by a dentist in Maine, uses the same mechanical principle. As the lever is cocked, the shaft inside the magazine built into the buttstock turns and feeds another round into the chamber. Why do you think this innovation never caught on?

Link -via Pocket Pistols, Historic Firearms, & Curiosities | Photo: Two Flints