Originally produced for use on television, this film shows some of the unusual uses of alginic acid compounds derived from seaweed. Applications of alginate compounds in the foods tit If and textile industries are illustrated.
The film sets out to describe the factors of stereoscopic vision and their projection requirements, especially geometrical. The various practicable methods of projection and viewing aids are ... More »
A discussion of various types of coal fuel followed by a detailed description of the construction and operation of a furnace using pulverised fuel. Lists the advantages of pulverized fuel firing and ... More »
Traces the discovery of magnetic properties from natural lodestone to the researches of Oersted and Faraday leading to the theory of lines of force and the magnetic field. Explains paramagnetism and ... More »
The family; differences between the sexes; changes during adolescence; characteristics of various body cells; the testes and spermatozoa; the ovaries and egg cells; fertilization and the early stages ... More »
Action of the pituitary in initiating adolescence; the development of the breasts during adolescence and pregnancy; the menstrual cycle; examples of identical and ordinary twins. (Age group: 13 plus.) More »