suggestions for an easy solar telescope?

I am a school teacher of 7th grade science students. This Spring, with my
honors group, I'd like to have them build a simple solar telescope. The
kind I have in mind is a simple type that I believe uses a single lens? and
projects the sun's image onto a card placed behind the lens. Although the
magnification isn't much, it still allows students to safely observe
sunspots. Although I recall seeing the design somewhere on the web, I
can't pinpoint anything specific. Can anyone suggest a link to the device
I'm talking about?

Thanks in advance,
Blaine


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