526 



Eye and Phenomena of Vision. 



No. 54323 



54326. 



54323. 1: 12. 





54327. 1:4. 



54324. 1 : 4. 



54325. 



54328. 1:4. 



s. d. 



53.302. Stroboscopic Disc after Topler, with clockwork drive, see Fig. 53,302, p. 432 ... 3. 0. 



53.303. - - i d e m, for hand drive, see No. 53,303, p. 432 2. 0. 



54,323. Stroboscope after Anschiitz, large pattern, Figure, with 10 rows of views ... 2. 0. 



* 54,324. Stroboscope, Figure, for the Projection Lantern, with 1 disc (W. D. Fig. 304 [287]) 1. 0. 



* 54,325. 3 Extra Discs for above, Figure, each 0. 2 0. 6. 



* 54,326. Projection Stroboscope, Figure, with 2 discs, showing dancers .1. 4.0 



* 51,067. Cinematograph, sec Fig. 51,067, p. 185 . . . . : 7. 10. 



* 51,068. Films for Cinematographs: 16, 24, 32, 48 m long: see No. 51,068, p. 186 



per metre length 0. 1. 6 



60,642. Lens Disc after Boys for the Stroboscopic analysis of spark discharges : see Fig. 60,642, 



p. 837 4. 0.0 



* 54,327. Anorthoscope for the Projection Lantern, Figure (Fr. Phys. Techn. II, 2, Fig. 3362 



[II, Fig. 881]), with 4 discs with distorted images, which on rotating appear in tin- 

 correct form but five times as large !.(>.(> 



* 54,328. Apparatus for Optical Fatigue and the successive Colour-contrast, Figure (Fr. 



phys. Techn. II, 2, Fig. 3497 [II, Fig. 894]) 0. <i. o 



The apparatus consists of a small wood frame and a glass disc half ground and half clear, with 

 a point in the middle. When the eye is fixed on this point for some time and the glass disc <|iiirkly 

 drawn away the section which previously was dark appears brighter to the eye. If the iina^r r:i-t 

 on the screen is coloured by the insertion of the coloured glass disc tin- design appears in the coin 

 plcmentary colours when the coloured disc is suddenly drawn away. 



54.329. White and Gray Cardboard for Fatigue Phenomena (M. T. p. 205) 0. 3. o 



54.330. 6 Different Coloured Pasteboard Squares with \Vhit<- St-am (M. T. p. 205) .... 0. I. o 



(1.1491,345, 

 * Can be used with the Projection Apparatus. 6089,6082, 



6091/93, 6079. 



