Table V. Glass 3 c. 



Width of beam = 3-25 cm. Thickness = -409 cm. 



Bending moment =21*4 kg. cm. 

 For this glass the table shows the results of concave and convex 

 bending. The transverse curvature exhibits a marked increase in 

 the one case and a slight decrease in the other. The longitudinal 

 curvature in the one case is practically unchanged, but in 

 the case when the longitudinal fibres of the surface observed 

 were under compression their curvature has slightly decreased. 

 This is noteworthy as being the only case in which the apparent 

 value of Young's Modulus undergoes an increase with time. 

 In each separate case, however, and in the mean values obtained 

 from the two combined observations, there is an increase in 

 Poisson's Eatio. (See Summary, Table VIII.) 



Table V. — Glass 3 c. 

 Transverse Frinoes. 



N. 



Concave Transverse Curvature. 



Convex Transverse Curvature. 



i(A„+/-A n 2 ). 



KA n+7 s-A w 2). 



After 1 Minute. After 50 Minutes. 



After 1 Minute. After 50 Minutes. 



1 



•481 -476 



•397 -400 



2 



•480 -467 



•402 -402 



3 



•479 -471 



•403 -403 



4 



•469 -467 



•404 -405 



•406 -405 



5 



! 



6 





•405 -407 



7 



Mean Value \ Mean Value 



•406 -411 



Mean Value \ Mean Value 





. 477 . 470 



•403 -405 



Longitudinal Fringes. 





N. 



Convex Longitudinal Curvature. 



Concave Longitudinal Curvature. 



H±n + 8 2 -K T )- 



KA ?i+6 2 -A„*). 



1 



•095 



•096 



•092 -092 



2 



•095 



•096 



•090 -092 



3 



•096 



•095 



•090 -091 



4 



095 



•09(5 



•089 "091 



5 



095 



•095 



•088 



•091 



6 



•096 



095 



•088 



•090 



7 



•095 -094 







8 



•094 -094 



Mean Value 



Mean Value 





Mean Value Mean Value 



■ 



•095 -095 



•089 



•091 



