36 



SOUND. 



SOUND. 



(45) VELOCITY OF SOUND IN METRES PER SECOND. 

 In air at t C. 332 '4 4- 'Gt metres = 1093 feet ? 



In Gases at C. 



Hydrogen 



Oxygen 



Carbon monoxide 



Carbon dioxide 



Nitrous oxide 



Ethylene 



In Liquids. 



Water at 8 C 



Absolute alcohol 



Ether 



Lead 



In Solids. 



2464 

 1998 

 2664 

 2664 

 3230 

 3330 

 3730 

 3397 

 3996 

 4995 

 5028 

 5028 

 4163 

 5661 

 5080 



(48) THE DIATONIC SCALE. 



(47) THE NUMBER OF COMPLETE VIBRATIONS FOR EACH NOTE 

 OF THE MIDDLE OCTAVE OF AN ORDINARY PIANO. 



