Inclined Planes for the Descent of Bodies. Composition of Forces and Movements. 



259 



51815. 1:18. 



51 817. 1 : 7. 



51 821. 1 : 10. 



51.817. Apparatus for demonstrating the Composition of two Rotations (Biernacki's), Figure [ s. d. 

 (Ztschr. f. d. "phys. u. chem. IT., 19, 1906, p. 80), large pattern, suitable for explaining ! 

 Fresnel's explanation of the rotation of the polarisation-plane of light 5. 0.0 



51.818. idem, but smaller 3.10.0 



1,819. Kinegraph (Engelmeyer's), for recording compound motions, their components and 

 resultants (Ztschr. f. d. phys. u. chem. U., 9, 1896, p. 134; Fr. phys. Techn. I, 2, Fig. 3176) 



3. 0.0 



51.820. Hartl's Apparatus for recording the Parallelograms of Motion (Ztschr. f. d. phys. u. 



chem. U., 17, 1904, p. 226; Fr. phys. Techn. I, 2, Fig. 3177) 1. 5.0 



51.821. Apparatus for explaining Compound Motions, Figure (Fr. phys. Techn. I, 2, 

 Fig. 2210), with movable stand, so that the diagonals may be set at various lengths, 



and with graduated arc 2. 5.0 



The wing mechanism of theatre stages can be explained with this apparatus. 



Cl. 3T84, 



497, 467. 



528Z, 4128, 4S4. 1 7 



