Table 266. 



ALLOYS AT LOW TEMPERATURES. 



by Cailletet and Bouty at very low temperatures. The results show that the coefficient of change with temperature 

 the alloys. The resistance of carbon was found by Dewar and Fleming to increase continuously to the lowest 



ments or MuUer, Benoit, and others. Probably the simplest rule is that suggested by Clausius, and shown by these 

 temperature. This gives the actual change of resistance per degree, a constant ; and hence the percentage of change 

 approximately hold for alloys, some of whidi have a negative temperature coefficient at temperatures not far from 



Temperature ^ 



Metal or alloy. 



Aluminium, pure hard-drawn wire 



Copper, pure electrolytic and annealed . 



Gold, soft wire 



Iron, pure soft wire .... 



Nickel, pure (prepared by Mond's process 

 from compound of nickel and carbon 

 mono.xide) 



Platinum, annealed 



Silver, pure wire 



Tin, pure wire .... 



German silver, commercial wire 



Palladium-silver, 20 Pd + 80 Ag 



Phosphor-bronze, commercial wire 



Platinoid, Martino's platinoid with i to 2% ) 

 tungsten ) 



Platinum-iridium, 80 Pt + 20 Ir 



Platinum-rhodium, 90 Pt + 10 Rh . 



Platinum-silver, 66.7 Ag -f 33-3 P* • 



Carbon, from Edison-Swan incandescent \ 

 lamp ) 



Carbon, from Edison-Swan incandescent ) 

 lamp ) 



Carbon, adamantine, from Woodhouse and I 

 Rawson incandescent lamp j 



•182° 



197- 



Specific resistance in c. g. s. units. 



1928 



757 

 1207 

 4010 



6110 



894 



272 



604 



1067 



1900 



42i8Xio« 



4079X108 



6533X108 



4321X108 



4180X108 



178 



608 



2290 



Mean value of 

 temperature co- 

 efficient between 

 — 100° and 

 -f 100° C.» 



.00446 

 431 



375 

 578 



538 



341 



377 

 428 



035 

 039 



070 



025 



0S7 

 312 

 024 



031 



029 



* This is a in the equation /? = ^o ('+«""). as calculated from the equation o=: — '°^^~""' 



Smithsonian Tables. 



257 



