No. 51862. 



Universal Apparatus. Inclined Planes. 



267 



51 856. 1 : 12. 



51 859. 1 : 5. 



51 860. 1 : 8. 



51 862. 1 : 8. 





of wire, both having 40 cm length of side; 1 Circular Disc of 30 cm diameter, of sheet aluminium; 

 1 Equilateral Triangular Disc of 30 cm side and 1 Rectangular Disc 10x30 cm; 1 Driving Weight of 

 10 g, 1 of 5 g, 2 of 2 g, 2 of 1 g; 12 Paper Weights; 1 spare tip, spare thread. 



The following can be demonstrated with the apparatus: 1) the Fundamental Principles of Me- 

 chanics; 2) the Laws of uniformly accelerated and retarded Motion; 3) Moments of Inertia; 4) the 

 Laws of periodic Oscillations. 



51,850. Cycloidal Double Railway (Thierfelder's), Figure, for demonstrating the swinging 

 motion of the Cycloidal Pendulum, of the Parallelogram of Directions and the Impact 

 Action, with 3 steel balls, 2 electromagnets, cell, switch on terminal board and connect- 

 ing leads (Ztschr. f. d. phys. u. chem. U., 21, 1908, p. 244) 



The railway consists of two hinged parts which can be set up at any angle relative to each 

 other. The electromagnets can be moved along the cycloidal track, being actuated simultaneously 

 by a switch. 



51.857. Demonstration Apparatus for the Statics and Dynamics of Rigid Bodies (Topler's) 

 (Ztschr. f. d. phys. u. chem. U., 1, 1887/88, p. 137; Fr. phys. Techn. I, 2, Figs. 3278 

 to 3281) 



For proving the hypothesis of the plane polygon of forces, of equilibrium and of the centre of 

 parallel forces, of the equilibrium of couples of force and any forces on the flat or in space, of the prin- 

 ciple of virtual velocities, of the equilibrium of forces on a body rotating on a fixed axis or movable 

 in a fixed direction; of the centre of momentum of motion, of progressive motion, of the action of 

 the couple on the freely moving body, and of uniformly accelerated and oscillating Rotary Motion. 



51.858. Accessories for explaining the Centre of Gravity (Eugen Meyer's) (Ztschr. d. V. d. I., 

 Vol. 53, 1909, p. 1301, Xo. 14, and text-sheet 16, Fig. 44) 



51.859. Apparatus for proving the Law of the Inclined Plane (Prick's) (Fr. phys. Techn. I, 2, 

 Fig. 2206 [Fig. 121]), Figure 



The two rollers are in equilibrio, since their weights are as the lengths of the inclined planes 

 pertaining thereto. 



51.860. Inclined Plane, simple, with metal roller, balance pan, graduated arc and height rule, 

 Figure 



51.861. - - idem, with iron feet, as Fig. 51,863 



51.862. Inclined Plane, Figure, of wood, with metal feet, 250 g roller, with 1 tared balance 

 pan and 6 hooked weights each of 50 g (Fr. phys. Techn. I, 2, Fig. 2202) 



This apparatus has a plain, 2-colour centimetre graduation. 



s. d. 



4.10.0 



17.10.0 



3.15.0 



0.12.0 



1.16.0 

 2. 0.0 



2. 5.0 



Cl. 



. 



493, 4'.ll. 



