11451. Large Effects of Small Causes (30:22)

Date:
1958
Summary:
Uses laboratory experiments to explain catalytic actions. Demonstrates principles which govern catalysis. Explains the difference between organic and inorganic catalysis. Tells how man's conception of catalytic reactions has changed through the years. Features how man's conception of catalytic reactions has changed through the years. Features Dr. Leonard K. Nash, Professor of Chemistry, Harvard University. (WGBH-TV) Kinescope.

11452. Leathercraft and summing up (30:14)

Date:
1958
Summary:
Dr. Conant and Shari Lewis gives a summary of the series, pointing out that man’s hands are the greatest tool of creative activity, that they have served to fulfill his basic needs and that these needs and this creativity are universal.

11453. Left Hands, Red Hair, and Crime (29:44)

Date:
1958
Summary:
Describes the folklore connected with crime. Uses vignettes to show the absurdity of such superstitions as handedness, hair coloring, scars, blemishes, deformities, and glandular problems as causes of criminality. Points out that an indirect relationship may exist between physical characteristics and crime. (KQED) Kinescope.

11454. Levers (15:07)

Date:
1958
Summary:
Uses demonstrations to explain how levers work. Illustrates with a seesaw, hammer, and screw driver. Shows how levers make the lifting of heavy objects easier. (WCET) Kinescope.

11455. Life Aboard a Clipper Ship (15:12)

Date:
1958
Summary:
Tells the story of sailing vessels and life aboard a clipper ship. Describes the various jobs performed by the sailors. Discusses the types of cargoes carried on trips to all parts of the world. (KQED) Kinescope.

11456. Life in a Gold Rush Town (14:59)

Date:
1958
Summary:
Tells the story of the deserted city of Columbia, California, one of the key Gold Rush towns in the 1850's. Describes the life and profession of people who went there seeking gold. Shows the old buildings and objects the people used at that time.

11457. Life's building blocks (29:32)

Date:
1958
Summary:
Uses slides, the microscope, and graphic illustrations to explain plant and animal cells. Discusses the basic content and structure of cells. Shows how cells differentiate and function as members of larger units--tissues and organs. Illustrates growth by cell division and introduces the concept of meiosis. (WGBH-TV) Kinescope.

11458. Light (15:08)

Date:
1958
Summary:
Uses demonstrations to explain principles of light. Shows why there is daylight and darkness. Discusses speed and reflection of light. (WCET) Kinescope.

11459. Light: Waves or Bullets (29:41)

Date:
1958
Summary:
Watch a searchlight as it pierces heavy night clouds. Notice that you don’t see the beam of light, merely where it comes from: the face of the searchlight, reflections from the clouds or duct blocking the beam. In other words, the light beam itself is invisible. Beginning with a similar demonstration, Edwin C. Kemble shows the difficulty science has had in providing a wholly satisfactory theory of light. He uses a stroboscopically lighted tank to illustrate wave theory and high-voltage discharges to suggest the violence necessary to generate radiant energy with short wavelengths. The violent damage done by X-rays, gamma rays and ultra violet radiation leads Kemble to the corpuscular explanation of light. By an examination of cloud-chamber photographs, visibly recording action in the unseen world of atomic particles, Kemble reconciles the two theories. The yield of this revolutionary work is dramatic: no less than the discovery of a universal property of all forms of existence.

11460. Lightning and electricity (15:02)

Date:
1958
Summary:
Explains lighting and its characteristics. Tells why lightning is first seen then followed by thunder. Demonstrates how lightning produces sound waves. (WCET) Kinescope.