Makin 



Rcture 



2^ 



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MANY persons would like to make 

 motion-pictures of their friends, but 

 the machines on the market are 

 too high-priced for the average purse. 

 The large companies take, print and pro- 

 ject their pictures with separate machines. 

 Following is the description of an arrange- 

 ment combining 

 all three mechan- 

 isms, the chief cost 

 being the lens. 



The heart of the 

 machine to be de- 

 scribed is the 

 cylinder-shutter 

 and intermittent 

 shifting device 

 shown at B, as in 

 detail in the upper 

 left-hand corner 

 of the drawing. It 

 consists of a round 

 wooden cylinder 

 of the dimensions 

 given. Through 

 one of the diame- 

 ters of this cylin- 

 der is mortised a 

 rectangular hole 

 I in. by ^ in. The 

 sprockets or pro- 

 jecting pins C are 

 set at a distance 

 of ^ in. from the 

 90 deg. point, 

 using the center 

 a base. These 

 forations in the 

 film accurately, 

 be rounded so 



The camera consists of very few parts and is 

 used for taking, printing and projecting the pictures 



of the mortised hole as 



pins should fit the per- 



standard motion-picture 



and the points should 



that they may enter the 



perforations without difficulty. 



In the drawing of the inside of the 

 camera, may be seen the shutter in position 

 to admit light to the film. The cylinder 

 revolves backward, and the pins engage 

 the perforations in the film, pulling it 

 downward exactly % in., while the light 

 passing through the lens is cut off from the 

 film. After the film comes to rest, the 

 cylinder continuing 

 in its revolution, the 

 light is again ad- 

 mitted to the film 

 through the opening 

 in the cylinder, thus 

 making the exposure. 

 After this the film is 

 again shifted ready 

 for the next ex- 

 posure, and so on 

 as fast as the 

 cylinder revolves. 

 The usual speed 

 is sixteen pictures 

 per second, which 

 means eight revo- 

 lutions of the 

 cylinder per 

 second. 



The film is 

 taken from the 

 upper roll, sup- 

 ported in the top 

 of the camera box 

 by the bracket D i , 

 and after passing 

 behind the spring-actuated roller-guides 

 El £2, it passes downward to the take-up 

 roll, which is connected on the outside of 

 the camera, by means of a belt, to a 4-in. 

 diameter driving-wheel. This belt is left 

 loose, so that it will pull the film only when 



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