258 



General Mechanics. 



51 805. 1 : 10. 



51 807. 1 : 13. 



51,805. Inclined Plane for the descent of bodies (Friedr. C. G. Miiller's), Figure, with track B. d. 

 of plate glass, 1 ivory ball and 1 small balance (M. T., Figs. 16 a and 35, and p. 60) 4. o. o 



51.807. Rail Apparatus (Inclined Plane), Hoefler's, Figure, for demonstrating the laws 

 of gravitation of the inclined plane; the principle of Inertia, Independence. Reaction,' 

 the Sine Oscillations, etc, (Ztschr. f. d. phys. u. chem. U., 7, 1894, p. 276; Hoefler. 

 Physik, Figs. 1, 6, 3638 and 52; Fr. phys. Techn. II, 1, Figs. 2194, 3104 a, 3167). 

 with 1 small carriage, 1 spring balance of 20 g mass, 1 long carriage, 1 small table and 



1 cord guide with pulley 11. o. o 



51.808. Carriage with Spring Dynamometer for above, for measuring the friction (Hoefler- 

 Poske, Fig. 25) . . . 0.15.0 



51.809. Apparatus for demonstrating the Fall of a Body through the chord, Figure, with 

 simultaneous mechanical release for the balls 2. 0.0 



51.810. -- idem, simple, and without mechanical release (M. P., Fig. 118 [117]) .... 1. 0. o 



51.811. Galilean Escapement Pendulum, for showing that the final velocity of a falling body 

 is only dependent on the height through which it falls (W. D., Fig. 72 [65]) (fall on curved 



path) and for confirming the law of Energy (M. T., Fig. 45), see Fig. 52,123 ... 0. !!.(> 



51.812. Centrifugal Pendulum, for proving the energy of motion (Fr. phys. Techn. I, 2, Fig. 3174) 1. 1 . o 



51.813. Apparatus for the Parallelogram of Path and the Composition of Impact Forces, 

 Figure, with 2 hammers and 1 glass ball (W. D., Fig. 65 [60]); M. P. I, Fig. 98; Fr. 



phys. Techn. H, 1, Fig. 3305) . (1.15.0 



51.814. Apparatus for showing the resultant of 2 Directions, F i g u r e, with 2 spring pistols 

 which can lie shot off separately or together. The board is covered with green cloth. 



being surrounded by a tall beading; with ivory ball 3. 0. 



51.815. Slab for the Parallelogram of Motions and the projectile path (Penseler's). F i g u r e 1. lo.o 



A piece of chalk, carried along in a perpendicular rail, and to which a regular upward motion 

 is given or a downward motion influenced by the acceleration of descent, is simultaneously given a 

 lateral nuili in by hand, the resultant appearing as a chalk line. 



1 1 ,8 1 ii. Grimsehl's Apparatus for the Composition of uniform and non-uniform Motions (Xtschr. 



f. d. phys. u. chem. r., 17, 1904, p. 257) 1.15.O 



Graduated glass slabs can be slid along a board which is placed in a sloping position. If a j;l;i" 

 slab and recording pencil are moved along a definite length in one direction and the' pencil is thru 

 moved along a divided edge of the glass slab in another direction, the point determined by the parallel.. 



of forecs is reached. 



Cl. M-' I. 



5081. 



