No. T.1832. 



Parallelogram of Forces. 



261 



51 831. 1 : 5. 



51 832 A. 1:10. 



51.828. 1 Set Hooked Weights, Figure (as suggested by Friedr. C. G. Miiller) (M. T., p. 30), d. 

 6 of 10 g each, 6 of 20 g, 4 of 100 g, 2 of 200 g and 2 of 500 g 1. 8.0 



51.829. Parallelogram of Forces Apparatus (Frick's) (Fr. phys. Techn. 1, 2, Fig. 2152 [I, Fig. 107]), 

 without weights 1.12.0 



(For weights, see 51,824 c.) 



51.830. - - idem (Bertram's), Figure, entirely of metal (Fr. phys. Techn. I, 2, Fig. 2154 



[I, Fig. 114]), without weights | 2. 0.0 



51.831. -- idem, constructed entirely of metal, in the form shown in Fig. 51,831 . . . 2.15.0 



If suitable weights be suspended from the ends of the cords of the apparatus, the parallelogram 

 assumes such form that its sides and diagonals are proportional to the suspended weights. 



51.832. Parallelogram of Forces Apparatus (S'Gravesande's), Fig. A, with a number of 

 metal bars of various lengths, for obtaining parallelograms of different sizes, with 

 18 weights, Fig. B, suitable for the apparatus, in one wood block (Fr. phys. Techn. 



I, 2, Fig. 2150) 4.16.0 



Cl. 4518. 6023, 

 497:.. ITU. is::. 



