56 



thousands. One hun- 

 dred feet of film could 

 then be sold for a little 

 more than the cost of 

 the paper, or rented 

 for much less. 



Two types of pro- 

 jectors have be< 

 made. One model is 

 intended for use in 

 schools and churches, 

 while the other is suit- 

 able for home use. The 

 operating principle of 

 both types is the This form of 

 same; there is a 

 difference only in 

 the range of focus. 



The home model 

 is built into a cab- 

 inet, resembling 

 that of a phonograph. In fact, 

 phonograph cabinets with slight 

 interior alterations are at present 

 being utilized to assemble the 

 home projector. 



Paper film being opaque, it 

 must be reflected, rather than 

 projected on the screen. In 

 carrying out this principle, the 

 projection machine is placed in 

 the lower part of the cabinet 

 with its lens directed upwards 

 towards the lid. Fixed directly 

 over the projector is a brace 

 containing a ring of nitrogen 

 lamps and reflectors which are 

 arranged to throw their concen- 

 trated light on a spot over which 

 the paper film passes. Since the 

 nitrogen lamp is very cool, there 

 is no danger of burning the film. 

 The picture is reflected upwards 



Popular Science Monthly 



to a mirror disposed at an angle of 45 de- 

 grees and thence to the screen attached 

 to the lid of the cabinet. 



A small motor drives the pro- 

 jector mechanism, elec- 

 tric current being sup- 

 plied to the motor and 

 the ring of lamps from 

 any convenient lamp 

 socket. 



In addition to the 

 I animated pictorial rec- 

 1 ord that can be pre- 

 served of family and 

 of friends and of in- 

 teresting incidents 

 of sentimental 

 value, Mr. Webb 

 proposes to estab- 

 lish a circulating 

 library which will 

 furnish by mail, at nominal 

 cost, films of current interest 

 occurring the world over. Judg- 

 ing from the popularity of the 

 motion picture theatre, there is 

 every reason to believe that the 

 home picture cabinet will prove 

 as popular as the music cabinet. 

 It can be made to harmonize 

 with the surrounding furniture, 

 and is as ornamental as the pho- 

 nograph cabinet, with which it is 

 identical in appearance except for 

 the screen on which the pictures 

 are projected. This screen is 

 collapsible when not in use. It 

 is set in an ornamental frame 

 which serves as a shadow box, 

 so that the pictures may be 

 shown in broad daylight as suc- 

 cessfully as they can at night or 

 in a darkened room. 



Reflectors 



Light cays Paper film 



Light rays to film 



