l82 APPENDIX. 



N. - A turn-button, under which the line which 



carries the weights is put when packed for 



carriage. 

 O. - A pin on which the weights are put when 



packed. 

 P. - The pulley and ratchet by means of which the 



machine is kept going whilft it is winding up. 

 Q. - The weight that keeps the pendulum in 



motion. 

 R. - The counter-weight. 

 S. - The index which Ihows the feconds on a 



divided circle fixed on the axis of the fwing- 



wheel. 

 T. - The thermometer fufpended on a hook im- 



mediately behind the pendulum wire. 

 W. W. Two leather ftraps that fecure the whole 



when packed, as in fig. 3. 



NATURAL 



