Magnetizing and Demagnetizing Coil Gifts_Bar the drilled aluminum ball gives

the drilled aluminum ball gives a lightweight contrast to steel and brass balls of the same size in pendulum period and momentum-transfer demonstrations

this Hall's car supports dynamics work on inclined planes with weights and pulleys

and an ignition light that fires on compression

Dial-gauge expansion apparatus with three interchangeable metal rods for heating and measuring the small length change each metal undergoes

Magnetizing and Demagnetizing Coil Gifts_Bar the drilled aluminum ball givesInsulated copper solenoid 155mm long with a 27mm internal diameter, switch, and 4mm terminals, drawing 6V AC for demagnetizing and AC or DC for magnetizing iron bars and strips.