December 01, 1991 Filed in: Demo Corner
T.J. Elgin Wolfe, University of Toronto
An interesting demonstration that makes use of the location of the virtual image formed by a plane mirror can be done with a black cloth, a small candle (about 2 cm in height), a dull dark opaque shield about 3.5 cm tall and bent at right angles, a large pane of thin window glass, two retort stands, 4 adjustable clamps, a 400 mL beaker, and coloured water. To highlight the beaker in the dim light, outline the outer edges (as viewed by the class) with masking tape. Read More...
March 01, 1991 Filed in: Demo Corner
Frank Allan, Science Co-ordinator, Ottawa Board of Education
The world’s simplest speaker can be constructed in a matter of seconds. Read More...
Tags: Electricity, Magnetism