“Heat Spinner,” Friend, May 1981, 26
Heat Spinner
Here’s a clever toy that you can make to prove that heat rises. Paste a 2″ cardboard disc to bottom of spool for solid base. From construction paper cut 3″ disc, then cut disc into a spiral. Leave small, uncut portion in spiral’s center. Sharpen long pencil and, being careful not to poke hole through paper, make slight dent in middle of spiral’s center. Insert eraser end of pencil into spool base and carefully hang spiral on pencil point. Set heat spinner on radiator, above lighted bulb, or over other heat source and watch spiral spin.