mechanical pencil – Pushes graphite out by a mechanism such as a spring or a screw. More…
pinwheel – Originally a mechanism in a clock. More…
gadget – May come from French gachette, which is or has been applied to various pieces of mechanism, or from Gaget, the person who created the first so-called gadgets—miniature Statues of Liberty sold in Paris—or from a Navy term for a tool or mechanical device for which one could not recall the name. More…
rack, pinion – Rack is the linear gear and pinion is the circular gear in a mechanism. More…