Stephen Gray

Stephen Gray (c. 1666–1736) was an English scientist whose experiments showed that electrical effects could travel along wires and other materials. He distinguished materials that transmit electricity from those that prevent its passage.

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Electrical conduction: The movement of electric charge through a material or other medium. Gray established that electrical effects could pass from an excited object through a connecting material.
Electrical transmission over distance: The transfer of an electrical effect between separated points through a connecting path. Gray demonstrated transmission over hundreds of feet using suspended lines.
Francis Hauksbee: An English natural philosopher known for early experiments with static electricity and evacuated glass vessels. Hauksbee’s electrical demonstrations at the Royal Society preceded Gray’s work.
Frictional electricity: Static electricity produced by rubbing two materials together. Gray’s experiments began with charge generated by rubbing glass.
Electrical insulator: A material that strongly resists the movement of electric charge. Gray found that some materials stopped the electrical effects his experiments transmitted.
John Godfrey's experiments: Experiments conducted by Gray’s collaborator John Godfrey on electrical effects and material transmission. Godfrey assisted Gray in testing long-distance electrical conduction.
Isaac Newton: An English mathematician and natural philosopher whose work reshaped physics and mathematics. Newton supported Gray’s admission to the Royal Society, recognizing his experimental contributions.
Experimental philosophy: An approach to natural knowledge based on observation, experiment, and public demonstration. Gray’s findings depended on controlled demonstrations rather than speculation about electricity.
Electrical conductor: A material that allows electric charge to move through it. His experiments showed that metals and other materials could carry electrical effects.
Royal Society: The United Kingdom’s national academy of sciences, founded in 1660. Gray presented electrical experiments to the Society, which helped circulate their results.