No. 54 337. 



Stroboscopy. Eye Fatigue. Subjective Colours. 



527 



54 332. 1 : 4. 



54 331. 1 : 4. 



54 333. 1 : 3. 



54 334. 1 : 4. 



54336. 1:11. 



54 335. 1 : 6. 



54 337. 1 : 2. 



* 54,331. Apparatus for Eye Fatigue and the successive Colour-contrast, Figure (W. D., 



Fig. 308 [291]) 



* 54,332. Apparatus for Successive and Simultaneous Colour-contrast, Figure; perception of 



subjective Colours (Fr. phys. Techn. II, 2, Fig. 3498) 



* 54,333. 2 Coloured Glass Plates for simultaneous Contrast, 8 J / 2 x 10 cm, Figure (W. D. 



Fig. 310 [293]) 



The plates fit the lantern slide holder of the Projection Lantern. 



54,334. Apparatus for Showing the Contrasted Colours as Coloured Shadows, Figure (cf. 

 M. P., II, 1, p. 393 [446]), with 2 coloured plates 



A coloured glass disc mounted in a frame has a round hole and, in front of the latter, a bi-convex 

 lens. In this manner a coloured ground can be covered over on the screen by a white sphere of light. 

 If a rod is held in the latter the half-shades occurring appear in the complementary colours and the 

 principal shades in the more vivid colour of the background. In this experiment the objective head of 

 the lantern must be removed, and the rod held behind the focus of the luminous pencil. 



s. d. 

 0. 10. 



0. 8.0 

 0. 6.0 



0.12.0- 



o.i6. a 



54.335. Apparatus for Coloured Shadows, Figure.... 



54.336. Apparatus for Explaining the subjective Colours, after Norrenberg, Figure (M. P. 



II, 1, Fig. 297 [396]) ' 0. 12. 0- 



54.337. Apparatus for showing the contrasted Colours, after Eagona Scina, Figure (M. P., 



II, 1, Fig. 298 [398]), with four coloured glasses i 0. 8. 



* Can be used with the Projection Apparatus. 



Cl. 6090, 350, 348, 6084, 6088, 

 1501, 1502. 



