Metals at High Temperat 



xir es. 



383 





Table II I. 









Palladium Bar. 







2' 

 rune 26. 



(mm.) 



June 28. 



As 

 Observed. 



(mm.) 



Calculated 



1-476 

 1-611 

 1-729 



1-878 



1-470 

 1-616 

 1-739 



1-858 





 1-473 



3-087 

 4-821 

 6-689 





 1-475 



3-082 

 4:821 

 6-692 



0° 



250 



500 



750 



1000 



the expansion at 250°, 500° and 750°, equal to 1-617, 1*720 and 

 1*840 respectively, were obtained. A permanent increase in 

 length after the preliminary heating amounting to 0-024 mm was 

 observed ; the permanent changes after succeeding heatings in 

 no case amounted to 0-01 mm . 



The expansion of the bar employed may be represented by 



X s = 5-636£ + 0-00106^) 



Its length at 0° was 482*9, whence 



A = {11670* + 2-187£ 2 }10- 9 



3. Platin-iridium (80 Ft, 20 Ir). 



The series of measurements upon the platin-iridium bar 

 which are contained in the Tables Ilia and I1IJ were all made 





Jan. 19 



t 



16" 

 1810 

 4193 

 6757 

 9514 

 9569 

 9560 



MV 



Table Ilia. 

 Platin-iridium Bar. 

 M 

 (mm.) 



0-348 

 0-850 

 0-636 

 0-969 

 1-045 

 1-043 



M' 

 (mm.) 



0-595 

 0-318 

 0-592 

 0-322 

 0-276 

 0-273 



2 

 (mm.) 



0-943 

 1-168 

 1-228 

 1-291 

 1-321 

 1-316 



Jan. 24 



Jan. 26 



17*9° 

 1862 MY 

 4181 

 6708 

 9528 



18*8° 

 1843 MV 

 4170 

 6705 

 9527 

 9539 



0-675 

 0-654 

 0-607 

 1-163 



0-557 

 0-664 

 0-411 

 1-786 

 1-797 



0-291 

 0-462 

 0-604 

 0-189 



0-406 

 0-456 

 0-813 

 0-450 

 0-463 



0-966 

 1-116 

 1-211 

 1-352 



0*963 

 1-120 

 1-224 

 1-336 

 1*334 



