Elastic Constants of Glass. 



565 



Tables VI. and VII. 



Glass 1 b. 



Width of beam = 2-57 cm. Thickness = -571 cm. 



(Table VI. =20-7 kg. cm. 

 Bending momenta m n vtt no o i 



* (_ Table VII. = 28-2 kg. cm. 



The variations of transverse curvature shown by this beam were 

 the opposite of those exhibited by the wider beams. 



The tendency shown is for the curvature to decrease, especially 

 at the edges, and to become more uniform. 



The longitudinal curvature shows an increase in each case, 

 roughly proportional to the bending moment. 



Table VI.— Glass I b. 

 Transverse Fringes. 



■' 



After 1 



Minute. 



After 50 Minutes. 



KA n 4 2 2 -A„ 3 ). 



A « + l 2 ~V- 



i(A w+2 2 -V). 



A»+i 2 -A/. 

 1-038 



1 



1077 



1026 



1-076 



2 



1-066 



1128 



1-072 



1-102 



3 



Mean Value 

 1-071 



1-005 



Mean Value 

 1-074 



1-054 



Longitudinal Fringes. 



N. 



KA n+6 2 -A, t 2). 



K-Avi + t^— A ;i 2 ). 



1 



•213 



•212 



2 



•215 



•213 



3 



•216 



•214 



4 



•215 



•215 



5 



•214 



•213 



6 



•215 



•213 





Mean Value 



Mean Value 





■215 



■213 



