No. 54354. 



Optical Illusions. Additive and Subtractive Colour Synthesis. 



529 



54 353. 1 : 8. 



54 354. 1 : 8. 



5 54,346. 2 Colour Discs, 8V 2 x 10 cm, for explaining the Mixing of coloured Lights, Fig. A, I d. 

 and for demonstrating the Superposing of layers of Transparent Colours, Fig. B (Fr. | 

 phys. Techn. II, 2, Figs. 3467 and 3495) j 1. 5. 



54,347. Anaglyphon, after Ducos du Hauron (Plastoscope) (W. D., p. 433) 0. 2. 



The two-colour image is observed through spectacles having a red and a blue glass, and this 

 image appears plastic. 



1 * 9605. Projection Chromoscope after Ives, for obtaining photographs in natural tints by addi- 

 tive colour synthesis (Fr. phys. Techn. II, 2, Fig. 3484) 13. 0. 



The apparatus can also be used for explaining mixed and complementary colours, absorption 

 phenomena, etc. 



* 9606. Photos for above, 3 diapositives on one plate Each 0. 7. 



Colour Discs and Colour Jackets for use with the Whirling Table, see Nos. 52,034 52,042, 

 pp. 284 and 285. 



54,076. Top for rotating Colour Discs, with flywheel and handle : see Fig. 54,076, p. 504 . 0. 10. 

 54,078. Colour Disc with Rotating Apparatus: see Fig. 54,078, p. 504 1. 5. 



* 54,079. Transparent Colour Disc after Newton, with 7 colours on glass, for .objective pro- 



jection, with device for rotating: see No. 54,079, p. 504 1. .0.0 



* 54,350. Colour Top with alternating mixed colour effects 1. 0. 



54.351. Coloured Wool in Portfolio, pink and orange, for demonstrating the influence of mode 



of illumination on colour impression (W. D. p. 429) 0. 3. 



54.352. Model of the Perspective Images of a Cube, Figure, with transparent image- 

 plane 1. 5. 



The Cube is placed behind the transparent plane. Its corners are connected with the visual 

 point by cords carried through corresponding perforations in the disc of the image. The connecting 

 lines of the holes in the disc demonstrate the perspective image. The model has two visual points 

 for two different images. 



54.353. - - idem, with Cone, Figure 1. 5. 



54.354. - - idem, with Small House, Figure, with 1 visual point 1. 5. 



* Can be used with the Projection Apparatus. 



