Category Archives: 1950s
Discusses the role of light pressure in the universe. Shows how light pressure on a thin foil suspended in a high vacuum sets the foil into oscillation. Includes a discussion of the Crookes radiometer. B W 1959 Educational film about physics, exploring the notion that light exerts pressure on the objects it strikes. The host [...]
Traces the story of printing from ancient times to the present. Shows early methods using carved wood blocks, transition from printing pictures to printing letters, Gutenberg’s contribution, evolution of modern type face and effects of the industrial revolution. Educational film, for young children, about printing technology andnewspaper presses.00:00:41:00 B/W 1950Boy carves simple design into potato, [...]
Introduces the subject of transverse progressive waves by illustrating a pulse being sent down a stretched rope. Shows its velocity of travel to be dependent upon the elastic and inertial factors. Longitudinal wave disturbance is shown by a pulse moving down a row of beads connected by light-weight springs.