American Educational Products Magnet Kit 7-497 for Grades 6-12, Magnetic Kit -

The Projector of Magnetic Lines-of-Force may be used to show magnetic lines-of-force of various permanent magnets; while the Magnetic Lines-of-Force Viewer demonstrates steric magnetic field and formation of its lines-of-force using iron powder in liquid immersion. Special features of the Projector of Magnetic Lines-of-Force include simple construction, easy handling, sharp image, and clear results. May be observed directly or by means of projection. Simply shake the container thoroughly before use, place it on a magnet, and the lines-of-force will be seen immediately. To use the Magnetic Line-of-Force Viewer, the instrument is rotated and shaken up and down, until the iron powder is well mixed with liquid. Next, a magnet or electromagnet is pushed into the hole and lines-of-force may be clearly seen. For Grades 6-12.