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491. The southwestern states (11:01)

Date:
1942
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Summary:
Shows life in Texas, Oklahoma, New Mexico, and Arizona, and the topography, rainfall, and other characteristic features, including the imprint of Spanish and Indian cultures. Irrigation, stock rais...

492. The Speed of Sound (14:38)

Date:
1956
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Summary:
Explains that a major problem of jet propulsion is increasing the speed of the expanding gas in the jet engine. Shows how the speed is increased by the addition of heat, more gas,and heavier molecu...

493. The teachers' crisis (17:07)

Date:
1948
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Summary:
Presents several reasons for the crisis in the teacher supply in 1947, including low salaries, lack of training, overcrowded conditions, and social restrictions.

494. The Trial--The Case for the Plaintiff (29:36)

Date:
1958
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Summary:
Documents and dramatizes a civil lawsuit based on an automobile injury case. Dramatizes the beginning of the trial, showing how prospective jurors are chosen and questioned to determine possible bi...

496. The woodwind choir (11:26)

Date:
1938
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Summary:
Reveals the appearance, tonal qualities, and functions of various instruments of the woodwind choir--piccolos, flutes, clarinets, oboes, English horns, bassoons, and contrabassoons. Uses close-up p...

497. They Do Come Back (16:38)

Date:
1940
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Summary:
Tells the dramatic story of two young people whose lives are interrupted and threatened by tuberculosis. Shows modern tuberculosis case-finding, diagnosis, hospitalization, and rehabilitation afte...

498. Tobacco and the Human Body (15:17)

Date:
1954
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Summary:
Shows how scientists determine the content of the cigarette smoke entering the mouth and its effect on rabbits and humans. Shows how tars and nicotine from cigarette smoke are collected in a labora...

499. Touch clay : a ceramic experience (29:04)

Date:
1966
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Summary:
Presents scenes of natural objects typifying the things which inspire ceramist Dik Schwanke. Shows him at work in his studio, illustrating his methods of combining pottery and sculpture. Includes b...

500. Town Meeting of the World (14:07)

Date:
1952
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Summary:
Illustrates how the UN meets the need of men and groups everywhere for a forum in which men can speak to each other and to discuss their problems. Shows briefly the forming of the UN, the interrela...