Educational film guide ()

513-525.4 EDUCATIONAL FILM GUIDE RATIO AND PROPORTION— Continued tlonship between a ratio and a proportion is clarified. Tiie "Product of means equals product of extremes theorem" is covered in detail. The usefulness of ratio as a means of comparing quantities is emphasized SIMILAR TRIANGLES. KnowledgeBldrs 1946 12min sd (Practical geometry ser) $40, rent J2 513 sh-c-tr Guide Presents similar triangles in a graphic manner. Shows properties and demonstrates the "two angles equal" proposition. Gives an application in a new geometric situation 516 Analyfic geometry RECTILINEAR COORDINATES. Knowledge Bldrs 1939 lOmin sd $40, rent $2 516 sh-c-tr "This film shows how a point moves and becomes a line. After explaining positive and negative numbers from coordinate positions, It branches out into tri-dimensional areas. An excellent film in many ways, although technically scarcely more than average. A noble film attempt In the comparatively 'unfllmed' field of mathematics. Only suitable for advanced math students. [Should be useful for] solid geometry, advanced math, physics." PCW film service staff 523.2 Solar system 520 Astronomy EXPLORING SPACE. TFC 9min sd (Cinescope ser) apply 520 Jh-sh-c-ad Produced by Columbia Pictures Corp. "A film photographed in the Hayden Planetarium which takes the audience on a trip through space with close-ups of the Moon, Venus, Sun, Mars, the Milky Way, and excellent pictures of an eclipse of the sun showing Baily's Beads and the corona. Scientific and a very understandable commentary." Minnesota 522 Astronomical observatories and instruments EXPLORING THE UNIVERSE. EBF 1937 llmin sd (General science ser) S45, rent $2.50 522 Jh-sh-c Guide Collaborator: Walter Bartky, University of Chicago Demonstrates the principles and construction of telescopes. Shows by animation the binaries, trinaries, the variables and why they vary, galaxies and galactic rotation. Shows also what will happen to the Big Dipper in 100,000 years and the theory of the expanding universe HERMITS OF THE SKY. AFMm 1945 lOmin sd $32.50, rent $3 522 sh-c-ad The story of four voluntary hermits atop one of the highest observatories where these flcientists work and study in snow-bound isolation for nine months of each year. Their scientific and astronomical discoveries, occupations, and diversions are shown STORY OF THE TELESCOPE. Knowledge Bldrs 1944 llmin sd (Story of civilization) $40, rent $2 522 sh-c-ad Guide Effect upon ancient astronomical knowledge of the Invention of the telescope. Reflectors and refractor types SOLAR FAMILY. EBF 1936 llmin sd (General science ser) $45, rent $2.50 523.2 Jh-sh-c Guide Collaborator: Walter Bartky, University of Chicago The evolution of the solar system revealed according to the planetesimal hypothesis is followed by a portrayal of the real and apparent motion of the planets. Among the special phenomena presented are: the phases of Venus; retrograde motion of Mars, Jupiter and Us satellites; the apparent motion of Saturn's rings; orbits of the planetoids, Eros ajid Anteros; orbit of Halley's comet; and the motion of the solar system in space 523.3 Moon THE MOON. EBF 1936 llmin sd (General science ser) $45, rent $2.50 523.3 Jh-sh-c Guide Collaborator: Walter Bartky, University of Chicago The technique of animation and other cinematic devices present the story of the moon. The difficult concept of tides Is explained, as are the phases of the moon. Other lunar phenomena explained by special cinematography and animation are: the moon's orbit; the lunar month; sunrise and sunset on the moon; occultatlon of stars; the moon's path in space; lunar eclipses; and solar eclipses with special reference to the eclipse of 1932 523.7 Sun SOLAR PROMINENCES. Mich.U 1948 llmin sd rent $1.50 523.7 c-ad Shows many types of eruptive phenomena which take place from the surface of the sun. Film is technical and meant for adult audiences 525 Earth EARTH IN MOTION. EBF 1936 llmin sd (General science ser) $45, rent $2.50 525 Jh-sh-c Guide Collaborator: Walter Bartky, University of Chicago Presents the dynamic aspects of the earth as a planet. The earth's sphericity is demonstrated, while rotation is established by star trails and the Foucault pendulum. Proof of the earth's revolution about the sun Is presented by motion of the sun in respect to stars and by the annual parallax of stars. The film concludes with phenomena associated with this revolution "Highly technical." Collaborator WORLD WE LIVE IN. KnowledgeBldrs 1939 lOmin sd $40, rent $2 525 Jh-sh Presents the earth as a planet — Its rotation, division into hemispheres, oceans, continents and effect of the sun on the earth "A close-up study of our earth as one of the planets. Presents many Interesting and startling facts about our earth." School management 525.4 Geographic coordinates Latitude. Longitude LATITUDE AND LONGITUDE. UWF 1947 * lOmin sd $45, rent $1.50; also color $80, rent $3 525.4 Jh-sh-ad Guide Produced by Gaumont British Instructional Films in collaboration with the Royal Geographic Society 374