Pyrometry: A Practical Treatise on the Measurement of High Temperatures (Classic Reprint) - Brossura

Darling, Chas R.

Brossura

ISBN 10: 1331949084 ISBN 13: 9781331949084

Casa editrice: Forgotten Books, 2018

Riassunto

Excerpt from Pyrometry: A Practical Treatise on the Measurement of High Temperatures

The next step in advance was the introduction of the expansion pyrometer by John Daniel] in 1822. The elongation Of a platinum rod, encased in plum bago, was made to operate a magnifying device, which moved a pointer over a scale divided so as to read temperatures directly. Although inaccurate as com pared with modern instruments; this pyrometer was the first to give a continuous reading, and required no personal attention. The expansion pyrometer - with different expanding substances - is still used to. A limited extent.

The year 1822 was also marked by Seebeck's discovery of thermo-electricity. The generation Of a current of electricity by a heated junction Of two metals, increasing with the temperature, appeared to afford a simple and satisfactory basis for a pyrometer, and Becquerel constructed an instrument on these lines in 1826. Pouillet and others also endeavoured to measure temperatures by the thermo-electric method, but partly owing to the use of unsuitable junctions, and partly to the lack of reliable galvanometers, these workers failed to Obtain concordant results. The method was for all practical purposes abandoned until 1886, when its revival in reliable form led to the enormous extension Of the use of pyrometers witnessed during recent years.

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Dettagli dell'edizione

• Editore: Forgotten Books
• Data di pubblicazione: 2018
• Lingua: Inglese
• ISBN 10: 1331949084
• ISBN 13: 9781331949084
• Rilegatura: Copertina flessibile
• Numero di pagine: 274
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