INSTRUMENTS FOR EXPERIMENTS ON SOUND. 



LECTURE I. 



IT is my intention to speak this morning on certain modes of 

 eliciting, reinforcing, or distributing sonnd. Of course we 

 cannot go into every such method it would be impossible 

 within the time allotted. "What, therefore, I propose to con- 

 sider are the more scientific modes, which are not exactly 

 musical, but such as are employed for experimental and corn- 

 putative purposes. The excellent classification given by 

 Professor Clerk-Maxwell in the handbook of this Exhibition 

 will be my guide. He speaks of vibrations and of waves ; 

 taking first amongst such vibrations the physical aspect of 

 acoustics. 



VIBRATIONS AND WAVES. 



PHYSICAL ASPECT OF ACOUSTICS. 



1. Sources. Vibrations of various bodies. 



Air. Organ-pipes, Resonators, and other wind instru- 

 ments. 



Eeed instruments. 

 The Siren. 



Strings . . Harp, &c. 



Membranes . Drum, &c. 



Plates . . Gong, &c. 



Rods . . Tuning-fork, &c. 



