87 



Table of Values of e^, the square of the Dynamical Coefficient of Elasticity, 

 or of the ratio of the Velocity of Separation to the Velocity of Approach, 

 of different hodies in collision. 



Substances. 



Velocity of Approach. 



Square of Dynamical 

 Coefficient 

 of Elasticity = 







16 fti per sec. 



0-5208 

 0-4462 



Steel on Iron and Iron on Steel,"" 





16 ft. per sec. 



24 

 32 



40 „ 



0-2952 

 0-2685 

 0-2-)88 

 0-2245 



Steel on Oak, fibres horizontal, . 





16 „ 



24 



32 



38-4 „ 



0-1172 

 0-1157 

 0-1041 

 0-0933 



Steel on Oak, fibres vertical, . . | 



32 ft. per sec. 

 38-4 „ 



0-0931 

 0-0887 



Steel on Teak, fibres horizontal, . 





16 ft. per sec. 

 24 „ 

 32 

 40 



0-1719 

 0-1 GG6 

 0-1562 

 0'1379 



Brass on Steel, | 



1 6 ft. per sec. 



24 „ 



i 



0-1380 

 0-1134 



MONDAY, FEBRUARY 24, 1862. 



The Yeey Eev. Charles Geaves, D. J)., President, in the Chair. 



The Eev. Dr. Eeeves exhibited and described drav/ings of some ancient 

 sepulchral inscriptions found in the province of Ulster. 



The episcopal seal of the Right Eev. Dr. "William Eitzgerald, late 

 Lord Bishop of Cork, Cloyne, and Eoss, was presented to the Museum 

 by his Lordship. 



Thanks were voted to the donors. 



* There was an absolute agreement in the results obtained by dropping steel on soft 

 iron, and, vice versa, soft iron on steel. 



