The 19th-century electric pen that revolutionized permanent art
Modern tattooing relies on technology that has remained remarkably stable since the 189 scale. By repurposing Thomas Edison's writing tools, two inventors transformed a manual poking process into a motorized precision art. Discover how electromagnetic coils and rotating flywheels turn simple electricity into the rhythmic buzz of the tattoo parlor.
Before the turn of the 20th century, tattooing was a laborious manual process involving the hand-tapping or poking of needles into the skin. The shift toward automation began with two pivotal patents inspired by Thomas Edison’s 1876 electric pen—a device originally designed to punch stencils through paper. Inventors realized this same mechanical force could penetrate skin to deposit pigment.
The first major advancement came on December 8, 1891, when New York City artist Samuel O’Reilly patented the rotary machine. This device utilizes a motor and a flywheel to spin a cam. This spinning motion is converted into a reciprocating linear motion, pushing the needles up and down smoothly and rapidly. This mechanical efficiency allowed for a much more consistent application than the traditional hand-poking method.
The second iconic design is the coil machine, patented by Charles Wagner on August 23, 1904. This machine is responsible for the characteristic deep buzz heard in many studios. It operates through an electromagnetic cycle: a spring-loaded armature bar is attached to the needles. When the bar is in its upward position, it completes an electrical circuit, activating dual electromagnetic coils. The resulting magnetic field pulls the bar down, breaking the circuit and allowing the spring to snap the bar back up, creating a continuous, rapid vibration.
Regardless of the machine type, the physics of ink delivery remains the same. The close-set needles leverage surface tension and capillary action—the same principle that causes water to climb the sides of a glass—to pull ink from a reservoir. As the needles pierce the skin, they deposit the pigment, where it becomes trapped to form the permanent image.
Source: How Do Tattoo Machines Work?
