424 Mr. Charles Tomlinsons ExjpeHments 



was C sharp in the second octave, and the other D in the 

 third octave ; and although, this result obtained with a 

 variety of small lipped glasses, and only an interval of 

 half a tone was obtained, yet this interval was decided, 

 and tended to confirm the theory of these curious pheno- 

 mena. On extending the inquiry to large glass vessels with 

 lips or handles, I obtained intervals varying from a second 

 to a fifth between the two fundamental tones, and thus, the 

 agreement between vessels of glass, and of earthenware, 

 &;c., was complete. 



126. Another result was interesting. A wedgwood- 

 ware funnel, fluted on the inside, gave two tones with an 

 interval of not quite half a tone between each. This 

 funnel had neither lip nor handle, and the results obtained 

 from it appeared at first to contradict the explanation 

 before given; whereas, they confirm it: — thus, it often 

 happens, that an apparent exception to a rule, if viewed in 

 a proper light, becomes as strong a confirmation of its 

 truth as a direct experiment does, and in this case, the ribs 

 or flutes of the funnel being so many bulgings which in- 

 crease the thickness of the funnel at those parts, act in a 

 similar manner to lips and handles in the other vessels. 

 When the funnel contained water four fans were produced 

 on its surface from each note, and the lower note was pro- 

 duced when the bow was applied to a point of the rim of 

 the funnel immediately above a rib or flute ; the upper 

 note was produced when the bow was applied at a point of 

 the rim between two ribs. Another funnel not ribbed, but 

 containing on the exterior near the rim a thick ornament 

 for the maker's name, afforded similar results ; this orna- 

 ment performing the part of the handle or lip in other 

 vessels. 



127. The wedgwood-ware basins above referred to, have 

 each yielded one second secondary tone due to an octo- 

 partite division of the vessel ; but in consequence of their 

 high pitch, I could not determine their value. In each 

 case, the eight fans jvere well marked, and on applying the 

 bow between two fans with a view to elicit a different note 

 also due to octo-nodal division, the four lower notes always 

 so prevailed, that I could only with difficulty get one 

 second secondary tone. 



