Determining the Elastic Constants oj Glass. 559 



Table I. (b) shows a slight decrease in the mean radius of longi- 

 tudinal curvature, indicating a decrease in the stress-strain ratio. 

 {Note. — Glasses 1 a and 1 b (Tables VI. and VII.) were cut 

 from the same plate.) 



Table I (a). — Glass 1 a. 

 Measurements of Fringes along Transverse Axis. 



(1) 8 Minutes after Loading. 



No. of 

 Fringe. 



| 



Position of Fringes, j 



Distance 

 apart of 

 Fringes, 



A 2 



4 2 A 2 



V2 2 -V 



Right, 1 Left. 



6 



2 



1 



8-57 to 8-27 



Oto 3 



Oto -09 





1-74 to 1-78 



2 



9 08 



7-76 



132 



1-742 



1-80 



••• 1-85 



3 



935 



7-46 



1-89 



3-572 



1-81 



... ! 



4 



9-58 



725 



2 33 



5-429 



1-79 





5 



978 

 9 94 



7-OS 

 6-92 



2-70 

 3 02 



7-290 

 9-120 



1-75 

 1-75 





6 



-U 



: 7 



1008 

 10-21 



6-80 

 667 



3-28 



10-758 



1-75 



...J 



i 8 



3-54 



12-532 





» 



1034 

 10-46 



6-54 

 6-44 



3-80 

 402 



14-440 

 16-160 



Mean 

 Value 





-W 



1 10 



11 



10-55 



6-33 



4-22 



17-808 



1-775 



...) 



12 



10-66 



623 



4-43 



19-625 







13 



1075 



6-14 



461 



21-252 





i 



(2) 



100 Minutes afte 



r Loading. 







i 



1 



7-95 













... 1-69 



2 



7-34 



8-56 



1-22 



1-488 



1-83 



••• L 1-81 



... J 



3 



7-08 



8-92 



184 



3-386- 



1-82 



i 4 ' 



684 



912 



2-28 



5-198 



1-80 





5 



6-66 

 6-49 



9-29 

 9-45 



2 63 

 296 



6-917 



8-762 



1-77 

 1-77 





6 



"■ I 1-84 



7 

 8 



634 

 6 21 



9 60 

 9-74 



3-26 



10-628 



1-76 



...! 



3-53 



12-461 





9 



6-08 



596 



9-86 



9-96 



3-78 

 4 00 



14-288 

 16-000 



Menu 





••• 1 1-70 



10 



11 

 12 



5-86 

 5-76 



10:07 



1016 



4-21 

 4/40 



17-7-24 

 19-360 



Value 

 1792 



... 1 



13 



566 



1026 



460 



21-160 







