Educational film guide (1945)

533-535 EDUCATIONAL FILM GUIDE ATMOSPHERE AND ITS CIRCULATION— Continued an Idealized globe without mountains or oceans. The circulation is explained in terms of the pressure bands surrounding the earth. The actual circulation or wind movements as affected by the earth's rotation is described In detail both for winds near the surface and for winds aloft Available from 10 or more film libraries or distributors ATMOSPHERIC PRESSURE. 15mln 16-si-$24 1928 EBF 533 Jh-sh-c Guide "Unbalanced air pressure; operation of the vacuum cleaner, effect of atmospheric pressure upon a vacuum; Magdeburg hemi Bphere demonstration; operation of a common lift pump; pressure variations In a Valley and on a mountain top; causes of land and sea breezes." Weaver Available from 10 or m,ore film, libraries or distributors SMOKE STREAMS. 30mln 16-sl-$90; rent $4 Franklin Inst 533 c-trade A visualized study of aerodynamics and air-flow phenomena. The 43 scenes Illustrate the nature of flow around objects classified under headings of Lift, Drag, High lift devices, Downwash effects. Tip losses and Miscellaneous flow phenomena "I think It an excellent Idea to use this film as a ready reference In the Engineering Department." Fleetwings, Inc. Bray ?90; rent |4 Mich Harvard PennS $2.50 111 $3 WashCE $3 THEORY OF FLIGHT. (Physics ser.) llmln 16-sd-$50 1941 EBP 533 Jh-sh-c-trade Guide 15c Illustrates the application of physical laws to forces acting on airfoils. Wind tunnel tests demonstrate the relation of air velocity to lift and drag on plain and cambered airfoils. Control of airplane movements about vertical, lateral, and longitudinal axes by means of the rudder, elevator, and ailerons, respectively, is demonstrated In pitching, rolling, and yawing. A companion film to PROBLEMS OF FLIGHT, class no. 629.13 "Our committee was very disappointed in the pedagogical value of these films." Collaborator "An excellent film for aeronautical training courses, and a good film for physics and general science classes at the Junior high through adult levels. Because of its content it is recommended that at least two, and preferably three, showings be planned for each class in which the film Is used. Technically, the film is above the average in every way." Don White In Educational screen Available from, 10 or more film libraries or distributors 534 Sound FUNDAMENTALS OF ACOUSTICS. (Univ. of Chicago physical science ser.) lOmin 16-sd550 1933 EBF 534 jh-sh Guide 15e By Dr Harvey B. Lemon and Dr Hermann I. Schlesinger of the University of Chicago, Dr Harvey Fletcher of Bell telephone laboratories, and Dr Donald MacKenzle of Electrical research products inc. The phenomenon of hearing and the modification of sound between the source and the hearer are emphasized in this film. The specific elements explained or demonstrated are velocity of sound, refraction, range of hearing, lowering intensity, attenuation In air, eliminating high and low frequencies, reverberation and focusing of sound Available from 10 or more film, libraries or distributors SOUND. 12min 16-sd-$30; rent $1.50 EPS 534 sh-c-trade-adult Guide "The recording Is made by the Victor Co. This film could be used by science classes, physics, and perhaps music classes would be Interested. Vibrations of wires, violin strings, etc. are heard, the high and low tones with the variations. Sound waves passing through the air with certain Intensity, and showing the effects of vibrations with other objects." J.K.W. Available from 10 or more film libraries or distributors SOUND RECORDING AND REPRODUCTION. (Physical science ser.) lOmin 16-sd-$50 1943 EBP 534 sh-c-trade-adult Guide 15c "This film describes how soimd is converted into light rays to produce sound motion pictures, and how the projector is able to change the light rays back into sound waves. "We learn from the film how the two great systems operate, sound recording by variable area and sound recording by variable density. The film ends with visualizations of sound as it appears by both systems. "A very good film for the purpose. . . There is a middle section of the film that is less intelligible than the rest, but in its entirety the film achieves Its aim." School management Available from 10 or m,ore film libraries or distributors SOUND WAVES AND THEIR SOURCES. (Univ. of Chicago physical ser.) lOmin 16-sd$50 1933 EBP 534 Jh-sh-c Guide 15c By Dr Harvey B. Lemon and Dr Hermann I. Schlesinger of the University of Chicago, Dr Harvey Fletcher of Bell telephone laboratories, and Dr Donald MacKenzle of Electrical research products inc. Demonstrates and explains several types of sound sources. The transmission of sound waves through the air is visualized. The characteristics of sound waves, such as frequency, amplitude, wave length, fundamentals, harmonics, are explained visually with acoustic accompaniment. The highspeed camera, animation, sound effects, and an oscilloscope are used to clarify these phenomena Available from 10 or more film libraries or distributors VIBRATORY MOTIONS AND WAVES. 20mln 16-sd-$60; rent $3 EPS 534 c Produced by Professor Llsinsky, Budapest, Hungary "This film opens by Illustrating the simple harmonic motion of the tuning fork by slow motion photography. By animation and slow motion it depicts damped, undamped, stationary and propagating waves. Wave length, phase, crest, trough, nodes, antinodes. condensation and rarefaction are all clearly defined. Both transverse and longitudinal waves are well treated. This film illustrates a subject that Is very difficult to demonstrate In the laboratory." W.Q.S. Gen SoVis Ideal $3.30 VES $2.50 NYSyr $3 535 Light BEHAVIOR OF LIGHT. 15mln 16-sl-$24 1930 EBP 535 Jh-sh-c Guide Introduces the subject of light. Presents the Ideas of transmission, shadows, and eclipses. Explains the formation of Images in plane, convex, and concave mirrors. Dem 224