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Bimetallic Strip & its uses

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by

Abdul Kadir

on 26 May 2015

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Transcript of Bimetallic Strip & its uses

Bimetallic Strip & Its Uses
History
This strip was invented by clock maker John Harrison in 1759. He made this to use in mechanical clocks. The first version was made by riveting 2 metals together, later Harrison improved it by melting and fusing the metals together.
Use in Thermostats
To measure temperature change when heating or cooling.
Use in Mechanical Clocks
On the balance wheel of a mechanical clock.
Bimetallic Strip
A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper. The strips are joined together throughout their length by riveting, brazing or welding. The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature.
Use in Thermometers
To keep the reading accurate in meat thermometers
John Harrison memorial in Westminster Abbey, London.
Use in Circuit Breakers
Used to stop excess flow of current.
Use in Fire Alarms
Used to ring a fire bell
Done by:

- Jay
- Abdulkadir
- Divyank
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