ABSTRACT OF PROCEEDINGS. XXV11. 



ance of architects and engineers in correctly designing such 

 structures. In both the tension and compression tests the 

 stress-strain curves show that the coefficient of elasticity 

 diminishes as the intensity of stress increases. In the case 

 of the beams, the deflections increased in a similar manner 

 with increasing loads, and the extensions of the extreme 

 fibre and the neutral axis, showed that the extensions in- 

 crease in a reinforced beam from the point where the 

 maximum tensile strength of the plain concrete has been 

 attained to the point where fracture occurs, where it may 

 be ten times as great as in a similar concrete beam not 

 reinforced. The tensile co-efficient of elasticity in a re- 

 inforced beam becomes less in proportion to the greater 

 extension, since the tensile strength of the concrete re- 

 mains constant during the period included between the 

 point where the fracture would have occurred in a plain 

 beam to the actual fracture in the reinforced beam. The 

 author's equations were compared with those obtained by 

 M. Considere, Professor Hatt, and the recent regulations 

 of the Prussian Government. 



EXHIBITS. 



The following celestial photographs were exhibited by 

 Mr. 0. J. Merfibld, f.r.a.s. : — 



Comet 1892-1, taken by Barnard of the Lick Observatory on 

 the dates 1892 April 7 - 28. 



Comet 1893 IV., by Barnard, taken on the dates 1893 October 

 20, 21, 22, and 1893 November 10. 



Comet Holmes 1892 III., by Barnard. 



Comet 1901 I., taken by Sir David Gill, at the Cape of Good 



Hope, on the dates 1901 May 4-6. 

 Great Nebula in Orion, by Sir Isaac Roberts. 

 Nebula about -q Argus, by Sir David Gill. 

 Dumb-bell Nebula Vulpecula by Barnard. 



