386 



Holborn and Day — Expansion of Certain 



The nickel differed from the metals already described in that 

 the permanent changes in the total length were in the opposite 

 direction ; the bar after cooling was always shorter than before 

 —after the first two series, 0'024 mm and 0'018 mm , and after the 

 last two, 0-016 mm and 0-035 mm , respectively. 



The observations (Table Va and Yb) can be represented by 

 a quadratic formula only above 375°. The measured expan- 



Table Ya. 

 Nickel Bar. 



June 30 



July 2 . 



July 4 



Sept. 18 



Sept. 19 



19-1° 

 1811 MV 

 4072 

 6551 



19-8° 

 1803 MV 

 2914 

 4066 

 6551 



20*2° 

 1793 MV 



4078 

 6552 



17-7° 

 6541 MV 

 9356 



18-4° 

 6578 MV 

 9332 



M 



(mm.) 



1-354 

 1-548 

 1-257 



1-102 

 0'953 

 0-651 



1-286 



0-937 

 1-766 

 1-314 



5-674 

 2-591 



5-942 

 2-495 



M' 



(mm.) 



0-227 

 0-407 



0-882 



0-469 

 0-038 

 0*330 

 0-863 



0-673 

 0-202 



0-822 



0-005 

 0-205 



0-271 

 0-158 



2 

 (mm.) 



1'581 

 1-955 

 2-139 



1-571 

 0-991 

 0-981 

 2-149 



1-609 

 1-968 

 2-136 



5-669 



2-386 



5-671 

 2-337 



19-0° 



1815 MV 



4081 



6561 



19-8° 

 1815 MV 

 2927 

 4075 

 6563 



20-2° 

 1799 MV 

 4083 

 6560 



17-8° 

 6537 MV 

 9358 



18-4° 

 6578 MV 

 9330 



M 



(mm.) 



1-377 

 1-542 

 1-261 



1-142 

 0-941 

 0-639 

 1-306 



0-953 

 1-753 

 1-325 



5-671 

 2-612 



5-939 

 2-505 



M' 



(mm.) 



0-218 

 0-415 

 0-865 



0-463 

 0-029 

 0-343 



0-848 



0-648 

 0-218 

 0-814 



0-013 

 ■0-222 



0-275 

 0-179 



2 

 (mm.) 



1-595 

 1-957 

 2-126 



1-605 

 0-970 

 0-982 

 2-154 



1-601 

 1-971 

 2-139 



5-658 

 2-390 



5-664 

 2-326 



t 



C 

 250 

 375 

 500 

 750 

 1000 



June 30. July 2. 



1-670 

 1-957 

 2-155 



1-678 

 0-975 

 0-990 

 2-168 



Table V b. 

 Nickel Bar. 

 2' (mm.) 

 July 4. Sept. 18. 



1-708 

 1-953 

 2-164 



5-770 



2-313 



Sept. 19. 



•748 



2-313 



A s (mm.) 



Observed. 



Calculated 











1-685 



(1-724) 



2-660 



2-661 



3-643 



3-648 



5-782 



5-772 



8-095 



8-096 



