PROCEEDINGS 



OF THE 



GEOLOGICAL & POLYTECHNIC SOCIETY 



AT THE TWENTY-EIGHTH QUARTERLY MEETING, HELD IN THE 

 HALL OF THE PHILOSOPHICAL SOCIETY, HALIFAX, 

 ON WEDNESDAY, MARCH 12tH, 1845. 



John Waterhouse, Esq., F.R.S., was called to the 

 Chair. 



On the motion of the Secretary, Dr. J. D. Heaton, 

 of Leeds, was elected a Member of the Society. 

 The following paper was then read : — 



ON vibrations producing sound, by wm. sykes ward, 



ESQ., OF LEEDS. 



In considering the nature of light, it has appeared to 

 me of importance that the phenomena of small vibrations, 

 and especially those producing sound, should be fully and 

 independently investigated ; not on the ground that any 

 supposed analogy would be conclusive, but that as the 

 undulatory motion of light has, to some extent, been pre- 

 sumed to be analogous to the motion of sound, it might 

 be well to ascertain whether the production or propagation 

 of sound is by undulatory or by progressive motion. 



It is readily perceived that sound is not substantial 

 matter — that sound does not occur unless produced by 



