Magnetism. 

 - Videocassette (VHS)(14 min.) : sd., col., 1/2 in. 
<br/><br/> Part One of a two-part film on magnetism which looks at Faraday's idea of a magnetic field or how the presence of the magnet makes a difference to the space it surrounds by giving it magnetic effects, and how you can map out the direction of the magnetic force by the lines along which a compass sets itself by means of iron filings. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Magnetism--Study and teaching.