APPENDIX. 



G. G. Fig. I. A flat board that forms one of the fides of 

 the box, fig. 3, and has two fmall mortifes 

 near its ends, which receive the points of the 

 fore-legs of the ftand ; two fmall fteel rods, 

 which are jointed near the lower end of the 

 back-leg hook into the ends of this board, 

 fo as to preferve the relative pofition of the 

 three legs unalterable : and near the middle 

 of it is fitted 



H. - A piece of filvered glafs, with a diamond 

 line on it from back to front, for adjufting 

 the pofition of the ftand : and 



I, - The trigger for locking the pendulum. 



K. - A wooden wedge which is occafionally put 



under either end of the board G. G. to adjuft 

 the ftand to its proper pofition j and when 

 packed, is put in its place, as reprefented in 

 the figure. 



L.L. L. Pieces of wood fcrewed to the legs, having 



cavities in them which embrace the pen- 

 dulum-ball when the legs of the ftand are 

 ' brought together in order to be packed, as 



in fig. 3. 



M. - A flat piece of wood, under the ends of which- 



are confined the fleel rods that conne£l the 

 back leg of the flands to the board G. Gi 

 when the fland is packed. 



N. A tunir 



181 



