A
recording thermometer is a type of
thermometerA thermometer is a device that measures temperature or temperature gradient using a variety of different principles. A thermometer has two important elements: the temperature sensor A thermometer (from the Greek θερμός (thermo) meaning "warm" and meter, "to measure") is a device that measures...
that records
temperatureIn physics, temperature is a physical property of a system that underlies the common notions of hot and cold; something that feels hotter generally has the higher temperature. Temperature is one of the principal parameters of thermodynamics...
changes over a period of time.
The recording thermometer uses a bimetallic strip that coils and uncoils as the temperature changes. One end of the strip is attached to a long,
light metalLight metals are metals of low atomic weight. The cut off between light metals and heavy metals varies. Lithium, beryllium, sodium, magnesium and aluminium are almost always included. Additional metals up to nickel are often included as well. Metals heavier than nickel are usually called heavy...
lever that holds a special pen. Tiny movement of the bimetallic strip causes much larger movement of the free end of the lever and the pen.
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A
recording thermometer is a type of
thermometerA thermometer is a device that measures temperature or temperature gradient using a variety of different principles. A thermometer has two important elements: the temperature sensor A thermometer (from the Greek θερμός (thermo) meaning "warm" and meter, "to measure") is a device that measures...
that records
temperatureIn physics, temperature is a physical property of a system that underlies the common notions of hot and cold; something that feels hotter generally has the higher temperature. Temperature is one of the principal parameters of thermodynamics...
changes over a period of time.
The recording thermometer uses a bimetallic strip that coils and uncoils as the temperature changes. One end of the strip is attached to a long,
light metalLight metals are metals of low atomic weight. The cut off between light metals and heavy metals varies. Lithium, beryllium, sodium, magnesium and aluminium are almost always included. Additional metals up to nickel are often included as well. Metals heavier than nickel are usually called heavy...
lever that holds a special pen. Tiny movement of the bimetallic strip causes much larger movement of the free end of the lever and the pen. The pen traces a rising and falling line on a strip of paper attached to a slowly turning drum. The drum usually makes one turn every seven or so days, so afterwards each strip of paper contains a complete and accurate record of temperature changes for an whole entire week.