jSo appendix. 



REFERENCE to PLATE XI. 



Fig. I . Is a general view of the apparatus wlien fitted up ; 



the pendulum being locked by the trigger, and 



ready for an experiment; 

 Fig. 2. The upper part of fig. i, on a larger fcale, in 



order to fhew the feveral parts more diftinftly. 

 Fig. 3. Reprefents the whole frame and apparatus when 



packed for carriage. 

 Fig. 4. Is the cap which covers the wheels and pallets, 



detached from fig. 3. 



A. Fig. 1. The pendulum-ball. 



B. B. The pendulum-rod. 



C. C. Fig. 2. The axis of the pendulum. 



D. - An oblong hole in the axis, into which the 



end of the pendulum-rod is fitted, and 

 fecured by means of the fteel pin c/. 



E. E. - The upper part of the wooden frame ; to 



which the three legs are ftrongly fixed by 

 hinges and table-joints, and on which is 

 fcrewed 



F. F» F. F. A ftrong brafs frame which fupports the 



pendulum and wheels. 



G. G» 



