Electric iron. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Household Appliances
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In the past, irons were heated on a special rack near a fire, on a hot stove, or with burning charcoal, which was loaded inside the iron through the top hinged cover with an ironing handle. To make the coals burn better, special holes were made on the sides of the case. Ventilation was increased by waving the iron.
With the spread of electricity, irons with an electric heating element appeared. The first such iron was demonstrated at the International Electrical Exhibition in Paris in 1881. A modern electric iron has a heating element that heats a metal plate - the sole of the iron. The heating temperature of the soleplate is set by rotating the thermostat knob with a bimetallic plate, which, heating up and cooling down, respectively opens and closes the electrical circuit, maintaining the set heating temperature of the soleplate of the iron.
Most fabrics iron best when damp. Water softens fabric fibers and makes them flexible. Therefore, they produce electric irons with a humidifier. In such an iron, water, flowing from a special container inside it, falls on the inner surface of the heated soleplate and turns into steam, which enters the fabric through the holes in the soleplate and moistens it. Some irons are equipped with a steam regulator. Such an iron has a piston, which, when the regulator button is pressed, releases steam or hot water droplets from the holes in the soleplate.
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