With today's projectors the size of a book and costing $800, and cameras the size of a golf ball and costing less than $100 it'll be neither 1000 pounds avordupois or 1000 pounds sterling -- although it'll be much closer to 1000 pounds sterling than 1000 pounds avordupois.
Sounds like an epdiascope - used to project a picture of a page or other object rather than a transparency. Haven't seen one for years; don't no if they are still available; and no idea what they would cost.
Sometime back, I came across a particular type of OHP which uses plain paper instead of transparencies. The base was slim, similar size to a USB scanner. It seemed to have some sort of digital camera on top instead of the usual lens/mirror arrangement used to project slides. So, when writing something on the paper, instead of just seeing the silouhette of the hand+pen like in conventional OHPs, you would see a real picture projection of the hand on the wall. But the OHP only projected in black and white.
Does anybody know who makes them and where I can get more info on it?
I have never seen such a device that also contains the projector, but a quite common setup is to use what is referred to as a "document camera" or "visual presenter" hooked up to either a portable or ceiling mounted projector. Most of the lecture halls in EECS at UC Berkeley are configured with such a device. They work rather well, especially since a regular pen can be seen, as apposed to the thick smearing transparency markers I can never make out.
Several manufacturers make these: elmo usa epson samsung avermedia
Prices seem to be about $2000 - $3000 standard, or $700 for a 'toy' model.