X-RAY MOTION PICTURES 145 



tographic quality up to its final projection on the 

 screen, checking for best results. A copying frame was 

 made with a 3x4 opening. Two pilot pins were ac- 

 curately placed to engage the holes punched in each 

 shadow-graph and then each individual exposure of 

 the 864 pictures in the long film was copied one by 

 one in the standard Bell and Howell camera. It 

 meant moving the film picture by picture, seeing 

 that the pilot pins were engaged perfectly each time, 

 making the correct exposure, moving the film, mak- 

 ing the exposure 864 times. It took nearly a day of 

 very careful, concentrated work to do it. That re- 

 duced film was developed, which was positive. A 

 negative was made in the usual way from it, from 

 which as many prints as desired could be made an 

 enormous amount of work, each step carefully done 

 to make possible the final result. 



On the screen the completed picture fifty-four feet 

 long took less than a minute to show and you can 

 imagine what interest invested that short period of 

 time, realizing our eyes were the first to see that kind 

 of picture. To make the comparison more complete 

 we had first the regular view of the rose bud unfold- 

 ing when the outside of the bud and petals were 

 pictured, then the fairylike shadow-graph, when we 

 looked right through the bud and saw the shadow- 

 like movements going on, never witnessed before. 



