Thermograph: Difference between revisions

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|Meaning=A self-recording [[thermometer]].
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|Explanation=The thermometric element is most commonly either a bimetal strip or a [[Bourdon tube]] filled  with a liquid. In the first case the bimetal element has the form of a helical coil with one end  rigidly fastened to the instrument and the other to the recording pen. In the second case the tube  is made with an elliptical [[cross section]] so that an expression of the liquid caused by a [[temperature]]  increase will cause the radius or curvature of the bend to increase, thus moving the instrument  pen, which is fastened to the tip of the tube. A [[resistance thermometer]] and a [[thermoelectric thermometer|thermoelectric  thermometer]] may be converted into thermographs if provision is made to record their [[output]].  <br/>''See'' [[aspiration thermograph]], [[hygrothermograph]], [[mercury-in-steel thermometer]].
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== thermograph ==
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<div class="definition"><div class="short_definition">A self-recording [[thermometer]].</div><br/> <div class="paragraph">The thermometric element is most commonly either a bimetal strip or a [[Bourdon tube]] filled  with a liquid. In the first case the bimetal element has the form of a helical coil with one end  rigidly fastened to the instrument and the other to the recording pen. In the second case the tube  is made with an elliptical [[cross section]] so that an expression of the liquid caused by a [[temperature]]  increase will cause the radius or curvature of the bend to increase, thus moving the instrument  pen, which is fastened to the tip of the tube. A [[resistance thermometer]] and a [[thermoelectric thermometer|thermoelectric  thermometer]] may be converted into thermographs if provision is made to record their [[output]].  <br/>''See'' [[aspiration thermograph]], [[hygrothermograph]], [[mercury-in-steel thermometer]].</div><br/> </div>
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Latest revision as of 11:43, 28 March 2024

A self-recording thermometer.

The thermometric element is most commonly either a bimetal strip or a Bourdon tube filled with a liquid. In the first case the bimetal element has the form of a helical coil with one end rigidly fastened to the instrument and the other to the recording pen. In the second case the tube is made with an elliptical cross section so that an expression of the liquid caused by a temperature increase will cause the radius or curvature of the bend to increase, thus moving the instrument pen, which is fastened to the tip of the tube. A resistance thermometer and a thermoelectric thermometer may be converted into thermographs if provision is made to record their output.
See aspiration thermograph, hygrothermograph, mercury-in-steel thermometer.

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