528 



Eye and Phenomena of Vision. 



No. 54 338 



54 338. 1 : 4. 



54339. 1:4. 



54 340. 1 : 4. 



54 341. 1 : 5. 



54 345. 1 = 6. 



* 54,338. Projection Plate for Optical Illusions, Figure (W. D. Fig. 313 [296]), consisting 



of one wood frame and one pair plates showing parallel lines apparently diverging from 

 top to bottom and bottom to top respectively 



* 54,339. 2 Plates for above (W. D. Fig. 314 [297]), showing parallel lines apparently bent in 



the middle 



* 54,340. 2 Plates for above (W. D. 315 [298]) four right angles having a common apex showing 



apparently acute and obtuse in pairs 



54.341. Cylindrical Lens with Prism, of small refractive angle, on stand, Figure (M. P., 

 II, 1, Fig. 137 [153]), for re-combining the light resolved by a prism and for producing 

 complementary colours 



The cylindrical lens is 80 mm diameter. The prism is cemented on to a sliding glass disc in 

 such manner that it can be conducted over the whole width of the lens. 



54.342. 7 different coloured Gelatine Slabs, 100 sq. cm., for use as a colour filter .... 



* 54,343. 2 Plane parallel Glass Vessels for objectively Demonstrating the Colours of Pigment 



Mixtures (W. I)., p. 425 [392]) 20 mm wide, with 2 pasteboard screens having circular 

 opening 



54,344. Apparatus after Rosenberg, Figure, for experiments on the dependence of the 

 body colour on the angle of inclination of the incident light (Ztschr. f. d. phys. u. chem. 

 U. 2, 1888/89, p. 38) 



0. 



0. 



o. 



8. d. 



6.0 



3. 



3. o 



2. s. o 



o. o. o 



o. 



1.10.0 



54,345. Apparatus for Mixing Coloured Rays and Material Colours, after Rosenberg. I-' i g u r e. 

 with 2 paraffin lamps and 2 plane parallel glass vessels for solutions of potassium bi- 

 chromate and copper sulphate respectively with the addition of liquid ammonia in the 

 surplus (Ztschr. f. d. phys. u. chem. I". 2, 1888/89, p. 296) 1. 



Hi. 



C;i!i lie used with the Projection Apparatus. 



Cl. 6095, 6096, 6085, 

 1505, 1504, 1506. 



