No. .M SSL'. 



Inclined Planes. Equal-arm Levers. 



269 



51 877. 1 : 10. 



51 881. 1:10. 



Couple of Forces Attachment (M. T., Fig. 22); Wood Blocks of 100 g for sliding friction; 1 each respec- s. d. 

 tively Slate, Sheet Metal and Plate Glass Slabs; 2 Sets of Wheels (M. T., Fig. 55); 1 Wood Roller 

 (M. T., p. 94). 



51.876. Apparatus (Grimsehl's), Figs. A and B, for demonstrating the tensive and com- 

 pressive strain in a solid, and for deriving the momentum theorem (Ztschr. f. d. phys. 

 u. chem. U., 16, 1903, p. 260) 



51.877. Apparatus for showing the Invariability of the static momentum on shifting the origin 

 of force in the direction of force, Figure (W. D., Figs. 73 A, B, C [66, A, B, C]) 



51.878. Equal-arm Lever, of aluminium, with steel axis and steel pins passing through, lac- 

 quered in two colours, on stand, Figure.. 



51.879. Equal-arm Lever, of metal, on iron stand, heavy type, Figure (W. D., Fig. 74 

 [67]). Without weights 



For weights, see No. 51, 824 c, p. 260, or No. 51,904, p. 273. 



51.880. 2 Metal Levers on metal stands, Figure, with 10 weights, specially suitable for 

 explaining the cooperation of parallel forces and for upwardly directed forces, and for 

 determining the bearing pressure 



Only one lever is shown in the illustration. 



51.881. Metal Lever, in frame, with pulley, Figure, also for forces directed upwards, 



with weights (Fr. phys. Techn., 7" 1 Edn., I, 2, Fig. 2095) 3. 0. 



51.882. - - idem, without weights 2. 5. 



For weights, see No. 51, 824 c, p. 260. 



2. 5.0 



0.18.0 



0.10.0 



0.12.0 



3. 0.0 



Cl. 5703, 499, 503, 

 4S8, 500, 501 





