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Diagram of a bimetallic strip showing how the difference in thermal expansion in the two metals leads to a much larger sideways displacement of the stripA bimetallic coil from a thermostat reacts to the heat from a lighter, by uncoiling and then coiling back up when the lighter is removed.
A bimetallic strip or bimetal strip is a strip that consists of two strips of different metals which expand at different rates as they are heated. They are used to convert a temperature change into mechanical displacement. The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. The metal with the higher coefficient of thermal expansion is on the outer side of the curve when the strip is heated and on the inner side when cooled.
The invention of the bimetallic strip is generally credited to John Harrison, an eighteenth-century clockmaker who made it for his third marine chronometer (H3) of 1759 to compensate for temperature-induced changes in the balance spring.[1] Harrison's invention is recognized in the memorial to him in Westminster Abbey, England.
^Sobel, Dava (1995). Longitude. London: Fourth Estate. p. 103. ISBN 0-00-721446-4. One of the inventions Harrison introduced in H-3... is called... a bi-metallic strip.
A bimetallicstrip or bimetal strip is a strip that consists of two strips of different metals which expand at different rates as they are heated. They...
bimetallic in Wiktionary, the free dictionary. Bimetallic or bi-metallic may refer to: Bimetallism, a monetary standard in economics Bimetallicstrip...
to highlight Harrison's most widespread invention, the bimetallicstrip thermometer. The strip is engraved with its own longitude of 0 degrees, 7 minutes...
spring by a clip attached to a bimetallicstrip. The heating element glows orange hot in seconds, causing the bimetallicstrip to bend and release the mechanism...
and iron. Bimetallicstrips and disks, which convert a temperature change into mechanical displacement, are the most recognized bimetallic objects due...
and actuate control operations. Mechanical thermostats commonly use bimetallicstrips, converting a temperature change into mechanical displacement, to...
small electric heating element attached to a bimetallicstrip. The force from the heated bimetallicstrip increases as its temperature rises until it overcomes...
This duration is controlled by the thermotime switch, which is a bimetallicstrip based device placed in the water jacket or in the case of an air-cooled...
commonly filled with neon gas or argon gas and typically contains a bimetallicstrip and a stationary electrode. The operating principle is simple, when...
consists of a heating element on each power wire which heats a bimetallicstrip. The hotter the strip, the more it deflects to the point it pushes a trip bar...
be a bimetallicstrip, often encased in a tubular glass bulb to protect it from dust or short circuit. Another common design uses a bimetallic shallow...
its stainless steel K1 model as the first fully automatic kettle. A bimetallicstrip, heated through a pipe by the steam produced as the water comes to...
current when touching and break the current when moved apart. Terminals Bimetallicstrip – separates contacts in response to smaller, longer-term overcurrents...
addition, the entrance to the vaporizing chamber is controlled by a bimetallicstrip, which admits more gas to the chamber as it cools, to compensate for...
Thermometer Bimetallicstrip Thermistor- Thermistors are thermally sensitive resistors whose prime function is to exhibit a large, predictable and precise...
engine cooling fans often use a heat-activated clutch, in the form of a bimetallicstrip. When the temperature is low, the spring winds and closes the valve...
a bimetallicstrip; because the strip contains two metals, the metals will expand at different rates when the temperature rises, causing the strip to...
the television program Doctor Who. In electrical switches, including bimetallicstrip based thermostats, the switch usually has hysteresis in the switching...
designed to have the probe in the meat during cooking. Some use a bimetallicstrip which rotates a needle which shows the temperature on a dial; the whole...
liquid thermometers, coil spring or "dial" thermometers that use a bimetallicstrip, and digital thermometers, which are often more precise. They may include...
to changes in temperature. A bi-metal mechanical thermometer uses a bimetallicstrip and bends due to the differing thermal expansion of the two metals...
thermal flasher unit which used a heating element, leaf spring, and a bimetallicstrip. When activated by the stalk switch on the steering column, the signal...
a timer (sometimes manually set) or by a thermal sensor, such as a bimetallicstrip, located close to the toast.[citation needed] Toasters may also be...
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