A source of moving air, such as a fan or bellows, introduces additional air into the fire through the tuyere. With additional air, the fire consumes fuel faster and burns hotter and cleaner - smoke can be thought of as escaped potential fuel.

A blacksmith balances the fuel and air in the fire to suit particular kinds of work. Often this involves adjusting and maintaining the shape of the fire.

In a typical coal forge, a firepot will be centered in a flat hearth. The tuyere will enter the firepot at the bottom.

In operation, the hot core of the fire will be a ball of burning coke in and above the firepot. The heart of the fire will be surrounded by a layer of hot but not burning coke.

Around the unburnt coke will be a transitional layer of coal being transformed into coke by the heat of the fire. Surrounding all is a ring or horseshoe-shaped layer of raw coal, usually kept damp and tightly packed to maintain the shape of the fire's heart and to keep the coal from burning directly so that it "cooks" into coke first.

If a larger fire is necessary, the smith increases the air flowing into the fire as well as feeding and deepening the coke heart. The smith can also adjust the length and width of the fire in such a forge to accommodate different shapes of work.

The major variation from the forge and fire just described is a 'back draft' where there is no fire pot, and the tuyere enters the hearth horizontally from the back wall.

Coke and charcoal may be burned in the same forges that use coal, but since there is no need to convert the raw fuel at the heart of the fire as with coal , the fire is handled differently.

Individual smiths and specialized applications have fostered development of a variety of forges of this type, from the coal forge described above, to simpler constructions amounting to a hole in the ground with a pipe leading into it.

A gas forge typically uses propane or natural gas as the fuel. One common, efficient design uses a cylindrical forge chamber and a burner tube mounted at a right angle to the body.

The chamber is typically lined with refractory materials such as a hard castable refractory ceramic or a soft ceramic thermal blanket ex: Kaowool.

The burner mixes fuel and air which are ignited at the tip, which protrudes a short way into the chamber lining.

More Example Sentences Learn More about forge. Keep scrolling for more. Are "forging ahead" and "forging a check" from the same forge?

First Known Use of forge Noun 13th century, in the meaning defined at sense 1 Verb 1 14th century, in the meaning defined at transitive sense 1a Verb 2 , in the meaning defined at sense 1.

Learn More about forge. Time Traveler for forge The first known use of forge was in the 13th century See more words from the same century.

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A career forge d making bold bets on global economic trends was faltering badly, taking the fun out of it for the year-old — and his few remaining investors.

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