ON THE MECHANICAL PROPERTIES OP METALS. 

 Experiment XVIII. — Sixteenth Melting. 



113 



The seventeenth melting failed in the casting, the metal being too stiff to 

 run into bars. 



Experiment XIX. — Eighteenth Melting. 



In this experiment the pressure was so great as to cause an adhesion of 

 the two metals, the specimen being so closely incorporated with the plates 

 as to require a hammer to effect the separation. 



Collecting the results obtained from the foregoing experiments into a 

 table of resistances to pressure, we have, in these resistances, derived from 

 the different meltings a remarkable uniformity up to the ninth melting, and 

 from that to the twelfth ; which it will be observed is the maximum point 

 of strength in the resistance to a transverse strain. From this point there 

 is a steady increase of resistance to compression. This is again pro- 

 gressive, until it reaches the maximum, or the fourteenth melting, where its 

 powers are doubled, and from this again to the eighteenth melting its resist- 

 ing power decreases, as may be seen by the following abstract of results. 



Abstract of Resistances from the foregoing Experiments. 



x2 



