scholarly journals VI. On the practical measurement of temperature: Experiments made at the Cavendish laboratory, Cambridge

1887 ◽  
Vol 178 ◽  
pp. 161-230 ◽  
Keyword(s):  
High Temperatures ◽  
Electrical Resistance ◽  
Platinum Wire ◽  
Cavendish Laboratory ◽  
Pure Platinum ◽  
Practical Measurement

In view of the enormous discrepancies at present existing in estimates of high temperatures, it is exceedingly desirable that strictly comparable thermometric standards should be issued by some recognised authority. Professor J. J. Thomson, in the course of a conversation which I had with him towards the close of 1885, suggested th at such standards could be issued in the form of platinum wire, the change of electrical resistance with temperature being determined by comparison for each specimen before issuing. The object of the present investigation was to test whether, in spite of the B. A. report on the Siemens pyrometer (1874), pure platinum wire might not be possessed of the necessary qualifications for such a standard.

scholarly journals XIX.—Magnetization and Resistance of Nickel Wire at High Temperatures. Part II.

1907 ◽  
Vol 45 (3) ◽  
pp. 547-554
Author(s):  
C. G. Knott
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Electrical Resistance ◽  
British Association ◽  
Nickel Wire ◽  
Present Communication ◽  
Association Meeting ◽  
The Subject ◽  
The Wire

The experiments which form the subject of the present communication were carried out two years ago, and supplement results already published. A brief note of some of the results was read before the Society in June 1904, and was also read before the British Association Meeting at Cambridge in August of the same year.The previous paper discussed the effect of high temperature on the relation between electrical resistance and magnetization when the wire was magnetized longitudinally, that is, in the direction in which the resistance was measured.The present results have to do with the effect of high temperature on the relation between resistance and magnetization when the magnetization was transverse to the direction along which the resistance was measured.

scholarly journals XIV. On the specific resistance of mercury

1888 ◽  
Vol 179 ◽  
pp. 351-376 ◽  
Keyword(s):  
Cross Section ◽  
Electrical Resistance ◽  
Specific Resistance ◽  
Silver Wire ◽  
Tabular Form ◽  
Cavendish Laboratory

Of late years several determinations of the electrical resistance of mercury have been made, and the differences between the results arrived at have been greater than would be expected at first sight from the nature of the observations involved. The results of the experiments have been expressed either in terms of the ohm (10 9 absolute C. G. S. units) or of the B. A. unit, which, according to the determinations of Lord Rayleigh and one of the authors of this paper (R. T. G.), is equal to ·98667 ohm. In the case of Lord Rayleigh’s observations, a direct comparison was made between the mercury unit and the original B. A. standards. Other observers have constructed copies of their mercury resistances in German-silver wire, which have been compared with the B. A. standards at the Cavendish Laboratory by one of us, or have compared their tubes directly with copies in platinum-silver wire of the B. A. units which have been sent from Cambridge after careful testing. The result of these various comparisons of recent years is as follows, and may conveniently be put in tabular form, giving the value in B. A. units of the resistance of a column of mercury 1 metre long, 1 square millimetre in cross section, at 0° Centigrade.

A simple apparatus for measuring electrical resistance of materials at high temperatures

1996 ◽  
Vol 67 (1) ◽  
pp. 333-334 ◽  
Author(s):  
G. V. Narasimha Rao ◽  
V. S. Sastry ◽  
T. S. Radhakrishnan ◽  
V. Seshagiri
Keyword(s):  
High Temperatures ◽  
Electrical Resistance ◽  
Simple Apparatus

scholarly journals Electrons in Transition Metals at High Temperatures

1993 ◽  
Vol 46 (5) ◽  
pp. 707 ◽  
Author(s):  
CK White
Keyword(s):  
Heat Capacity ◽  
High Temperatures ◽  
Electrical Resistance ◽  
Transition Elements ◽  
Electronic Heat Capacity ◽  
Temperature Behaviour ◽  
Electronic Density ◽  
Fermi Edge ◽  
Measuring Techniques ◽  
Electronic Heat

At high temperatures kT may be large compared with the scale on which major changes in the electronic density of states occur near to the Fermi energy E F , particularly for the transition elements. Mott first discussed the qualitative effects of this 'smearing' of the Fermi edge on the electrical resistance and thermopower of Pt, Pd, W, etc. Later Shimizu and colleagues examined the correlations in high-temperature behaviour of different transport properties, electronic heat capacity and susceptibility. Since then improved data have become available, largely through the use of sub-second measuring techniques. Is it now possible to provide a quantitative theoretical framework?

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