682 



OPTIC PROJECTION 



same by means of a magic lantern, and synthesi^ed or recombined the move- 

 ment on the screen as he had previously done in the zoetrope. From 1883- 

 1885, under the auspices of the University of Pennsylvania, over one hundred 

 thousand (100,000) pictures of movements of men and all kinds of animals were 

 made. These were published in several folio volumes in 1887. 



FIG. 409. THE D^EDALEUM OF HORNKR (ZOETROPE). 



(From Marey, Movement, 1895) 



In this instrument figures or photographs can be arranged in a band around 

 the inside of the cylinder, or, as in this, case models of a moving animal can be 

 arranged in order. When the instrument is revolved the images or models 

 seem to perform their natural movements of walking, flying, etc. 



The second period is represented by the making of the gelatino-bromide 

 process of photography practical by Maddox in 1871, and by making this 

 process exceedingly rapid by heating or boiling the emulsion (Bennett and 

 others in 1878 and later). 



The third epoch making period was inaugurated by the Rev. Hannibal 

 Goodwin when he worked out a practical method of making a solution and then 

 a film of transparent, tough, flexible cellulose which was unaffected by the 

 chemicals and liquids used in photography. 



His application for a patent was filed in 1887, and the patent granted in 

 1898, and the validity of the patent finally confirmed by the United States 



