JS4 1 EXPANSION OF CARBONATED HtDROGfcN. 



fquare of the velocity, and the time would not compenfatc for 



the difference of force. It is therefore eafy to fuppofe, that the 



law of the belPs vibration was in this experiment fuch, that 



the air advanced towards the barometer with a greater velocity 



than it receded, although for a (horler time; and that hence 



the whole effeel: was the fame as if the mean prellure of the air 



This law might had been increafed. Such a law might eafily refult from a 



from^uTbordinate C0mDmatl0n of a more regular principal vibration with one or 



vibrations, com- more fubordinate ones, in different relations ; and fimilar cafes 



b;ning with the mav f orne times De obferved in the vibrations of chords. Here 



principal. J 



we find a flight degree ofrepulfion, in confequence of the un- 



Slight repulfions dulations of an elaflic medium. Dr. Hooke attempted to ex- 



from th IS caufe pj j t j phenomena of attraction by means of fimilar undula- 



in elaflic medi- \ . , 



ums. tions of an ether, which he fuppofed to be the medium fcrving 



Whether gra- [ QV ^ e communication of heat: but it mull be confeffed, that 

 vuybefocaufed. . . _ . ., , r , ..,., 



the conjecture has little appearance ot probability. 



VI. 



On the Expanfion of Carbonated Hidrogen by Eleclricitj/. From 

 a Correfpondent, 



To Mr. NICHOLSON. 

 S I R, 



Expanfion of A VENTURE to trouble you with a few remarks on a phe* 

 b' arb j « d . r °? en nomenon in chemiftry, the expanfion of carbonated hidrogen 

 not yet explain- gas on the electric fpark being paffed through it. None of the 

 c d. explanations of this circumftance which I have met with, ap^ 



pear to me to be fatisfactory ; and I have ffated a few objec- 

 tions which occurred to me on confidering them. If you think 

 them of fufficient weight to fill a corner of your ably-conducled 

 Journal, fome correfpondent of greater abilities may perhaps 

 give a new explanation of the facl. But if you think them 

 beneath your notice, and unworthy of a place among the ex- 

 cellent communications with which your numbers are filled, I 

 have only to beg that you will pardon the prefumption of a 

 very young ch mill, who, by this firff attempt, has perhaps 

 only expofed his own ignorance. 



I am, Sir, 



Your's with much refpeel, 

 Edm. JuneS, 1802. G. H. 



On 



