How Tongs Work

Tongs are built from two long arms joined by a pivot or hinge near one end, with the arms crossing so that squeezing the handles together at one end closes the gripping jaws at the other, the same basic mechanism as a pair of scissors or pliers. The jaws themselves are shaped to match whatever they are meant to grip, often curved or notched to cradle the rounded body of a crucible securely from the outside without needing to touch its rim or its contents, and the long arms keep the operator's hands well clear of the heat radiating from a vessel just pulled from a furnace.

Squeezing the handles closes the jaws firmly enough to lift and carry the vessel's full weight, and the leverage built into the long arms means that grip can be maintained with far less hand strength than trying to hold a hot vessel directly would require, even as the vessel and its contents may weigh a considerable amount. Because the jaws contact only the vessel's outer surface, tongs let an operator tilt and pour from a crucible, moving molten metal or a heated substance exactly where it needed to go, entirely without exposing skin to either the vessel or whatever superheated material was inside it. Different jaw shapes suited different jobs, a wide flat pair for gripping a broad crucible and a narrower, deeper pair for reaching into a furnace to lift a smaller vessel out from among hot coals.