192 Dr. A. M. Mayer's Researches in Acoustics. 



Results obtained by other Experimenters on the change of the 

 Modulus of Elasticity tcith change of Temperature. 



I have found five researches on this subject. 

 Wertheim, 1844. Ann. de Chim. et de Rhys. 



Iron. 



Modulus 5'2 per cent, greater at 100° than at 18°. 

 Modulus 19-1 per cent, less at 200° than at 100°. 



Iron Wire. 



Modulus 4*9 per cent, greater at -f 10° than at —11°- 6. 

 Modulus 7-42 per cent, greater at 100° than at 18°. 



Wire of English Cast-steel. 



Modulus 23-23 per cent, greater at 100° than at 18°. 

 Modulus 9-46 per cent, less at 200° than at 100°. 

 Modulus at 200° is 11*57 per cent, higher than modulus at 

 18°. 



Steel Wire tempered to Blue. 



Modulus 1*97 per cent, higher at +10° than at —10°. 

 Modulus 5-1 per cent, higher at 100° than at 18°. 



Cast- steel. 



Modulus 2-8 per cent, less at 100° than at 18°. 

 Modulus 5'73 per cent, less at 200° than at 100°. 



Silver. 



Modulus 5 per cent, less at + 10° than at — 13°'8. 

 Modulus 1-87 per cent, greater at 100° than at 18°. 

 Modulus 12-87 per cent, less at 200° than at 100°. 



Copper. 



Modulus 6-53 per cent, less at + 10° than at -15°. 

 Modulus 6-58 per cent, less at 100° than at 1 8°. 

 Modulus 20 per cent, less at 200° than at 100°. 



Wire of Berlin Brass (Cu = 67-55, Zn =32-35). 

 Modulus 7*95 per cent, less at +11° than at —10°. 



Kupffer, 1856. Mem. de V Acad, de St. Retersb. 



Modulus of iron wire 5*5 per cent, less at 100° than at 0°. 

 Modulus of copper wire 8*2 per cent, less at 1 00° than at 0°. 

 Modulus of brass wire 3*9 per cent, less at 100° than at0°. 



