THE BELL SOLAR BATTERY 



Color Sound Bell Telephone local office 



12 minutes Free Loan 



After making the point that all energy comes indirectly from the 

 sun, the film documents the construction of a solar battery to use 

 this energy in ways that had not been utilized before. This was 

 possible by means of using the low cost source of power made avail- 

 able by the invention of the power transistor. A demonstration is 

 given of the working of a radio set powered by the sun. The method 

 of making the battery by using silicon from sand and arsenic is 

 detailed. The crystallization of the silicon, and its processes, are 

 then described. The film ends with a suggestion as to possibilities 

 for the future. 



AUDIENCE: Junior high; senior high; college; adult 



THE CHANGING CITY 



Color Sound Churchill Films 



16 minutes Sale Rental 



Introducing the economic, social and cultural advantages of the 

 city plus the use of animation showing its historical pattern of 

 growth through the nineteenth century to its present explosive 

 growth, this film explains the reason for cities. Cities don't just 

 grow the story emphasizes; they grow because of the need of people 

 for cities. The film documents problems of land use, blighted areas, 

 urban renewal, population density, and the desperate need for 

 civic planning. Graphic animation stresses the need of space for 

 culture, welfare, education, and health. A tempered well-reasoned 

 production which does not fall prey to extremists on either side of 

 the productivity-conservation debate. 



AUDIENCE: Junior high; senior high; adult 



THE CITY AND THE FUTURE 



Black & White Sound Sterling Educational Films 



28 minutes Rental Sale 



PART VI of LEWIS MUMFORD ON THE CITY 



Based on Lewis Mumford's justly celebrated book The City in 

 History, this series establishes through film taken in eleven coun- 



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