Metals at High Temperatures. 



381 



Table I c. 

 Platinum Bar. 





t 



M 



M' 



2 



t 



M 



M' 



2 







(mm.) 



(mm.) 



(mm.) 



(mm.) 



(mm.). 



(mm.) 



Feb. 24 



19-9° 









19*9° 











1900 MY 



0-799 



0-249 



1-048 



1912 MV 



0-799 



0257 



1'056 





4255 



0-680 



0-541 



1-221 



4265 



0-653 



0-564 



1-217 





6830 



0-312 



0-990 



1-302 



6838 



0-294 



0-985 



1-279 





9649 



1-143 



0*239 



1-382 



9660 



1-213 



0-198 



1-411 



Feb. 27 



17-8° 









17-8° 











1920 MV 



0-794 



0-275 



1-069 



1926 MV 



0*798 



0-280 



1-078 





4250 



0-548 



0-664 



1212 



4256 



0-554 



0-645 



1-199 





6823 



0-525 



0-759 



1-284 



6823 



0-498 



0-786 



1-284 





9639 



1-022 



0-345 



1-367 



9631 



1-055 



0-334 



1-389 



June 16 



20-3° 









20-3° 











1813 MV 



0-669 



0-375 



1-044 



1822 MV 



0-669 



0-357 



1-026 





4132 



1-417 



-0-217 



1-200 



4143 



1-425 



— 0-219 



1-206 





6600 



1-449 



— 0-191 



1-258 



6615 



1-469 



— 0-222 



1-247 





9422 



1-812 



— 0-395 



1-417 



9429 



1-810 



— 0-397 



1-413 



June 20 



20-1° 









20-1° 











4190 MV 



2-634 



— 0-375 



2-259 



4200 MV 



2-638 



— 0-379 



2-259 





6564 



1-381 



— 0-156 



1-225 



6570 



1-403 



-0-186 



1-217 





9365 



1-736 



— 0-328 



1-408 



9384 



1-751 



-0-343 1-408 



o c 



250 

 500 

 750 



1000 



Oven Tube 

 Feb. 24. Feb. 27 



Table Id. 

 Platinum Bar. 

 2' (mm.) 



Oven Tube II. 

 June 16. June 20. 



(mm.) 



1-111 



1-196 



1-114 

 1-192 



1-116 " 

 1-184 



-2-289 



1-271 



1-268 



1-270 



1-285 



1-344 



1-334 



1-386 



1-377 



Observed. 

 



1-114 

 2-301 

 3-574 

 4-934 



Calculated. 

 



1-112 

 2-304 

 3-576 

 4-928 



In connection with this table it should be mentioned that 

 the platinum bar was heated for the first time on Feb. 23, 

 when X 8 =2-306 mm was observed at 500° and X g =4'986 at 1000°. 

 After cooling, an increase in the total length amounting to 

 0-084 mm was measured. These permanent changes in the length 

 of the bar for the subsequent four days' observations contained 

 in the table were 0-020, 0-028, -0-007 and -0-004 respec- 

 tively. 



-Mat, 1901. 



Am. 



Jour. Sci.— Fourth Series, Vol. XI, No. 65. 

 25 



