200 



Holborn and Day — Gas Thermometer at 



Up to the present, however, no satisfactory substitute has 

 been found. The alloys of platinium with iridium and ruthen- 

 ium, in part also with palladium, differ little in their thermo- 

 electric properties from platin-rhodium. 



Pure palladium does possess a higher thermo-electric force 

 when combined with platin-rhodium than platinum, but can- 



Table XXII. 

 "Time Curves" (MV). 





Sb 



Sb 



Zn 



Zn 



Pb 



Pb 



Cd 



Cd 



Min. 



in Graphite 



in Graphite 



in Porcelain 



in Porcelain 



in Porcelain 



in Porcelain 



in Graphite 



in Graphite 



1 



6216 



5223 



3551 



3265 



2718 



2309 



2852 



2392 



2 



6080 



5294 



3500 



3316 



2671 



2353 



2809 



2425 



3 



5960 



5360 



3449 



3344 



2621 



2401 



2767 



2442 



4 



5840 



5408 



3400 



3351 



2574 



2450 



2726 



2449 



5 



5720 



5430 



3376 



3355 



2529 



2496 



2685 



2454 



6 



5600 



. 5437 



3376 



3359 



2506 



2503 



2646 



2456 



7 



5495 



5441 



3376 



3362 



2506 



2504 



2607 



2457 



8 



5390 



5443 



3376 



3365 



2505 



2505 



2570 



2458 



9 



5280 



5445 



3376 



3368 



2505 



2505 



2533 



2459 



10 



5190 



5445 



3376 



3369 



2505 



2505 



2496 



2459 



11 



5450 



5446 



3376 



3369 



2505 . 



2506 



2462 



2460 



12 



5454 



5447 



3375 



3370 



2504 



2507 



2460 



2460 



13 



5454 



5448 



3375 



3372 



2503 



2510 



2459 



2460 



14 



5453 



5448 



3375 



3372 



2502 



2514 



2459 



2461 



15 



5454 



5448 



3375 



3373 



2501 



2521 



2459 



2461 



16 



5452 



5449 



3375 



3373 



2497 



2529 



2459 



2463 



17 



5452 



5449 



3374 



3374 



2488 



2572 



2459 



2469 



18 



5451 



5450 



3373 



3374 



2473 



2676 



2459 



2485 



19 



5451 



5456 



3374 



3374 



2444 





2459 



2499 



20 



5448 



5468 



3373 



3374 



2365 





2458 



2525 



21 



5438 



5488 



3373 



3375 







2458 





22 



5310 



5512 



3372 



3375 







2457 





23 



5060 



5555 



3370 



3376 







2456 





24 





5655 



3366 



3389 







2454 





25 







3357 



3404 







2452 





26 







3342 



3433 







2449 





27 







3300 









2422 





28 















2367 





29 



















30 



















not be considered in this connection, for it is even less stable 

 at high temperatures than platinum. 



Thermo-elements made from different alloys of platin-rho- 

 dium such as were formerly used by Holborn and "Wien* for 

 temperatures above 1000° are also unsuited for general use on 

 account of their low sensitiveness. 



* L Holborn and W. Wien, loc. cit. 



