An Elementary Treatise On Heat
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is reached ; when, on heating the junc- tion still more, the current diminishes, and when the hot junction is as much above 260° C. as the cold junction is below this temperature, the current ceases. On raising the temperature still higher, the current is reversed in direction, and we have thermo-electric inversion, the cur- rent passing from iron to copper across the hot junction.
The temperature at the hot junction when the current begins to diminish is called the neutral temperature of iron ...and copper. Professor Tait has shown that the electro-motive force in a thermo-electric combination of two metals is proportional to the product of the difference of temperature of the junctions and the difference between the mean of the temperatures of the junctions and the neutral temperature of the two metals. Thus, in the case of copper and iron, if the hot junction be at 220° C. and the cold at 20° C, the electro-motive force is proportional to (220 - 20) (26O - ??0±10\ ile if the h e force is ] (600 40)^2 or 200 X 140, while if the hot junction be at 600° and the cold at 40° C, the force is proportional to 600 + 40\ 260- THERMO-PILES.
What to read after An Elementary Treatise On Heat?
You can find similar books in the "Read Also" column, or choose other free books by William Garnett to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
is reached ; when, on heating the junc- tion still more, the current diminishes, and when the hot junction is as much above 260° C. as the cold junction is below this temperature, the current ceases. On raising the temperature still higher, the current is reversed in direction, and we have thermo-electric inversion, the cur- rent passing from iron to copper across the hot junction.
The temperature at the hot junction when the current begins to diminish is called the neutral temperature of iron ...and copper. Professor Tait has shown that the electro-motive force in a thermo-electric combination of two metals is proportional to the product of the difference of temperature of the junctions and the difference between the mean of the temperatures of the junctions and the neutral temperature of the two metals. Thus, in the case of copper and iron, if the hot junction be at 220° C. and the cold at 20° C, the electro-motive force is proportional to (220 - 20) (26O - ??0±10\ ile if the h e force is ] (600 40)^2 or 200 X 140, while if the hot junction be at 600° and the cold at 40° C, the force is proportional to 600 + 40\ 260- THERMO-PILES.
What to read after An Elementary Treatise On Heat?
You can find similar books in the "Read Also" column, or choose other free books by William Garnett to read onlineMoreLess
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