52 Captain Kater's account^ &c. 



" centre of oscillation round C may be made to fall in c, 

 " which is known by the oscillations on C and c being 

 " isochronous. Therefore the distance of the edges is equal 

 " to the length of the simple pendulum which is isochronous 

 " with this compound pendulum/' 



Although it does not appear that this idea was ever put in 

 practice, it is evident, from the above extract, that the first 

 proposal to determine the length of the seconds pendulum 

 by means of the convertible pendulum, belongs to Professor . 

 BoHNENBERGER, and I take the earliest opportunity of ac- 

 knowledging his claims, in order that the credit of the iirsj: 

 suggestion may re^tjwh^re it J5 so justly due. " ,. 



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