The Westinghouse Electric Corporation gives an over view of the vacuum tube. The six basic functions of vacuum tubes are detailed, along with examples of .

The operation of a radio vacuum tube is explained using animated drawings. Terms such as filament, plate, and grid circuits are defined. Illustrates three .

The film shows speeded-up germination of the seed to form roots and shoot, at whose base the leaves later form a bulb. The flower produces pollen grains .

Piloting on water is navigating, using fixed points of reference on the sea or on land, usually with reference to a nautical chart, aeronautical chart or topographic .

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