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Outlines circumstances under which nurses frequently injure their backs. Proposes the solution to this risk, describing safe lifting techniques, good posture, exercises and diet.
Defines ‘navigation’ and shows how man developed methods of homing and how to determine latitude and longitude, using dead reckoning. Following Faraday’s discovery of electro-magnetic induction came...
Using maps and models interrelated to filmed views of the terrain from the air and ground, the film encourages the formation of a mental picture of the physical features of the ground by understanding and...
The performance of arrays of dipoles and parasitic elements, with or without the effect of the ground. Other aerials discussed include the rhombic, the loop, the slot and the horn.
Discusses the need for aerials and gives a non-mathematical explanation of electromagnetic radiation. Quarter and half-wave dipoles and their properties are described.
Working aerial installations covering the whole field of radio, from long wave telegraphy to microwave radar and radio astronomy are shown. The order of treatment is roughly from low frequency to high...
Animated diagrams show how intelligence is impressed on a carrier wave to form modulation. Explains vectors, amplitude phase and frequency modulation.*
Shows methods of ionisation and presents an account of the origins of the ionosphere. Defines MUF and LUF. The variations in the ionosphere include daily, seasonal, sunspot and those produced by solar flares*.
Part 1: Animated film shows the uses of astronomy in field surveys and the effects of the relative motions of the earth, sun and stars. Part 2: Animated film illustrates the geographical and celestial...
Describes temperature measurement and change of temperature with height; lapse rate, inversion and isothermal layer. Star radiation and the transfer of heat by conduction and convection. Adiabatic lapse...
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