376 





C. C. Ilatchins — Irregular 



Inflection. 







Paper 





Furrowed plaster 





Gal. 



Reduced. 



Gal. Reduced. 



10° 



151 



98*5 



217 



98-5 



20 



134 



87-6 



19:} 



87-2 



30 



117 



76-3 



169 



76'7 



40 



96-2 



62-9 



148 • 



67-3 



50 



80-5 



52*6 



121 



54-9 



60 



58-7 



38'4 



88-0 



40-0 



70 



37-5 



24-5 



59'5 



27-0 



80 



16-0 



10-5 



30-7 



13-9 



The curves derived from these observations (Figs. 3, 4) show a 

 wide departure from those of the plane surfaces and are not even 

 approximately coincident with the sine curve. The observa- 

 tions are, however, in exact accordance with the results derived 



