342 



GENERAL SCIENCE 



second. As a rule, the operator takes only about 55 to 58 pic- 

 tures. It will be readily seen that the pictures are not projected 

 as rapidly. This causes strange illusions in certain types of 

 pictures. The wheels of an automobile appear to be going around 

 in the wrong direction. If the pictures were projected as rapidly 



FIG. 220. 



as they were taken, the wheels would appear to go in the correct 

 direction. 



Sometimes comic pictures are taken in which the people travel 

 very rapidly. In such cases the moving picture camera has taken 

 the picture very much slower than it is ordinarily taken. When the 

 moving picture machine shows the picture, objects move very 

 rapidly. If opposite results are desired, the pictures are taken very 

 rapidly. 



