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  2. Fireplace insert - Wikipedia

    en.wikipedia.org/wiki/Fireplace_insert

    The fireplace insert was invented in 1742 by Benjamin Franklin, which he called 'The Pennsylvania Fireplace' (also known as the Franklin Stove), in the United States.He came upon the idea as a means of using coke (a smokeless fuel made by the destructive distillation of certain types of coal) and incorporated the use of an electric blower to improve efficiency.

  3. Fireplace - Wikipedia

    en.wikipedia.org/wiki/Fireplace

    Manufactured fireplaces are made with sheet metal or glass fire boxes. Electric fireplaces can be built-in replacements for wood or gas or retrofit with log inserts or electric fireboxes. A few types are wall mounted electric fireplaces, electric fireplace stoves, electric mantel fireplaces, and fixed or free standing electric fireplaces.

  4. Electric fireplace - Wikipedia

    en.wikipedia.org/wiki/Electric_fireplace

    The electric fire was invented in 1912 [2] and became popular in the 1950s. [3] Electric fireplaces found in 1950s homes were typically small and could be easily moved. [4] Techniques for electrical "flame effects" have been around since at least 1981. [5] Commercial electric fireplace techniques include the Optiflame, introduced in 1988 by ...

  5. Rumford fireplace - Wikipedia

    en.wikipedia.org/wiki/Rumford_fireplace

    He and his workers changed fireplaces by inserting bricks into the hearth to make the side walls angled, and they added a choke to the chimney to create a circulation of air inside the chimney. In the unmodified chimney, smoke rises up the chimney propelled only by buoyancy—the heated gases from the fireplace being lighter than the ...

  6. Double switching - Wikipedia

    en.wikipedia.org/wiki/Double_switching

    Double switching, double cutting, or double breaking is the practice of using a multipole switch to close or open both the positive and negative sides of a DC electrical circuit, or both the hot and neutral sides of an AC circuit. This technique is used to prevent shock hazard in electric devices connected with unpolarised AC power plugs and ...

  7. Timeline of United States inventions (before 1890) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    An electric mixer is a kitchen appliance used for whipping, beating, and folding food ingredients. It typically consists of a handle mounted over a large enclosure containing the motor, which drives one or two beaters. The beaters are immersed in the food to be mixed. The first electric mixer was invented by Rufus M. Eastman in 1885. [249]

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