No. 51 767. 



General Mechanics. 



251 



51 760. 1 : 6. 





51 761. 1 : 6. 



51766. 1:10. 



General Mechanics. 



(Motion and Forces.) 



51.760. Inertia Top, Figure (W. D., Figs. 61 and 62 [56 and 57]), of brass with wood 

 stand for releasing 



The top runs for 1 / 2 3 / 4 hour in a space filled with air and for 2 hours in vacuo. The steel 

 bearing in which the top turns must be oiled. 



51.761. Carriage with movable rollers (Schultze's), Figure, for demonstrating inertia 

 (Inertia Apparatus) (Fr. phys. Techn. I, 1, Fig. 3170 [I, Fig. 452]), with rail track . 



51.762. Mass Apparatus, for explaining the principles of the conservation of the centre of 

 gravity and of live force 



A large iron block is fixed to a small carriage, a reciprocal motion being imparted to the block 

 by a flywheel and crank. The carriage is also set in motion, the latter travelling on a rail track in 

 a direction opposite to the direction of motion of the mass. 



51.763. Apparatus for showing the Resistance of a body in repose to the reception of motion 

 (M. P., I, Fig. 227 [220]), consisting of a lead ball 1 kg weight, with two hooks joined 

 to hemp threads 



51.764. Device for proving that an appreciable time is necessary for the change in the condition 

 of motion of a body, Figure on p. 252, as suggested by Weinhold (W. D., Fig. 63 [58]) 



51.765. Device for showing the Inertia of a body in repose, Figure . 



A card is projected away from under a ball by means of a spring, the ball remaining in position. 



51,766 Inertia Pendulum (Maxwell's), Figure (Ztschr. f. d. phys. u. chem. U., 18, 1905, 

 P- 148) 



If the wheel on the suspending threads is rolled in an upward direction and then released, it 

 swings for some time in an up and down direction. 



51,767. Spiral Spring, width 10 cm, for demonstrating the force-action of a weight (M. T., p. 31) 



s. d. 

 2. 15. 



1. 16. 

 6. 10. 



0. 5. 



0. 12. 

 0. 16. 



0. 18. 

 0. 3. 



Cl. 450, 452, 

 451, 55BK. 



