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Re: blackboard grid

I have one (actually, two; one is rectangular and one is polar).
Unfortunately, they have no labels on them, so I don't know
where they came from. They are the pull down/roll up kind.

Carmen

At 10:29 AM 4/6/99 -0500, Mark Lattery wrote:
Phys-l,

All this talk about whiteboards has triggered a question I have about
blackboards. In high school, my teacher had a thin square pad, about 1
meter on a side, with many tiny holes in it. When he placed the pad
against the blackboard and rubbed a chalk-filled eraser over the surface,
the chalk bled through the
holes and formed a nice grid (made up of little dots) on the blackboard.

I have asked numerous vendors and manufacturers for this product and not
been able to find it.
Am I remembering incorrectly? Have you seen this kind of thing before?