102 A. M. Mayer — Researches in Acoustics. 



Results obtained by other Experimenters on the change of the 

 Modulus of Elasticity with change of Temperature. 



I have found five researches on this subject. I here give 

 abstracts of results from these papers. 



Wertheim, 1844. Ann. de China, et de Phys. 



Iron. 



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

 Modulus 19*1 percent less at 200° than at 100°. 



Iron Wire. 



Modulus 4-9 per cent greater at 4- 10° than at — 1 1°*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 4- 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 18°. 

 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 l'Acad. de St. Petersb. 



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

 Modulus of copper wire .8*2 per cent less at 100° than at 0°. 

 Modulus of brass wire 3*9 per cent less at 100° than at 0°. 



