IX 



X-RAY MOTION PICTURES 



No equipment for X-ray motion pictures is on the 

 market and if the work is done it is first necessary 

 to design and build the camera; make all the tests; 

 get the X-ray equipment, costing from $750 up; 

 combine it with the camera; and a lapse-time unit, 

 and start the experiments to learn how to operate it. 



One day I was watching a large caterpillar chang- 

 ing into its pupa. This was not so exciting. It merely 

 shed its skin, its legs and its horns and then went to 

 sleep as it were, but it gave me the idea what a won- 

 derful thing it would be if I could picture what was 

 going on inside its body while it was changing into 

 a great butterfly. I began to think about X-ray mo- 

 tion pictures. I knew nothing about X-ray work, and 

 had not at that time taken a still picture in that way. 



So I began reading everything I could get about 

 it. Starting on a lecture tour about that time, my 

 ideas of the requirements had crystallized into defi- 

 nite form, and on the Pullman I made drawings and 

 details of the parts required, to scale. In New York 

 I showed my drawing and talked with a doctor who 

 had spent thousands of dollars in perfecting an 



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